Underfoot Rummage

14:14:01 SYSTEM PROCESSOR INITIATED... > Found 54 records in database. > Mining publications > Gwynedd Cave & Pothole Club - Ogofa https://archive.org/details/ogofa > Annals of Belgian Mining https://archive.org/details/pub_annales-des-mines-de-belgique > Australian Mining https://archive.org/details/pub_australian-mining > Coal Age https://archive.org/details/pub_coal-age > Coal Mining magazine https://archive.org/details/pub_coal-mining-1949 > Engineering and Mining Journal https://archive.org/details/pub_engineering-and-mining-journal > Journal of Mining Science https://archive.org/details/pub_journal-of-mining-science > Mining Journal https://archive.org/details/pub_mining-journal > Mining World https://archive.org/details/pub_mining-world > Pit and Quarry magazine https://archive.org/details/pub_pit-quarry > Transactions of Society for Mining, Metallurgy, and Exploration https://archive.org/details/pub_transactions-society-for-mining-metallurgy-exploration > World Mining https://archive.org/details/pub_world-mining > Subterranea Britannica https://archive.org/details/subterranea > Bristol Industrial Archeology Society https://b-i-a-s.org.uk/bias-journal-index-2/ > Chelsea Spelaeological Society Newsletter https://chelseaspelaeo.org/club/newsletter/archive > Chelsea Spelaeological Society Publications https://chelseaspelaeo.org/club/publications > Council of Southern Caving Clubs https://cscc.org.uk/wiki/documents/newsletters > Kent Underground Research Group https://files.expounder.info/Documents/Underground/Kent%20Underground%20Research%20Group > 127 https://files.expounder.info/Documents/Underground/Kent%20Underground%20Research%20Group/127.pdf > 135 https://files.expounder.info/Documents/Underground/Kent%20Underground%20Research%20Group/135.pdf > Kendal Caving Club https://kendalcaving.org.uk/publications-by-kendal-caving-club/ > Mendip Caving Group https://mendipcavinggroup.org.uk/about-us-contact-us/mcg-publications > Moldywarps Speleological Group https://nymcc.org.uk/publications/moldywarps-speleological-group/ > Scarborough Caving Club https://nymcc.org.uk/publications/scc-archives > YURT Archives https://nymcc.org.uk/publications/yurt-archives/ > Articles https://pdmhs.co.uk/files/articles.php > Newsletters 1959-1975 https://pdmhs.co.uk/newsletter-archives-series-1-1959-to-1975 > UK Mines in 1896 https://pdmhs.co.uk/uk-mines-in-1896 > Derbyshire Caving Association https://thedca.org.uk/publications > University of Bristol Spelaeological Society https://ubss.org.uk/publications/newsletters/ > University of Bristol Spelaeological Society Proceedings https://ubss.org.uk/publications/proceedings/ > Cambrian Caving Council https://www.cambriancavingcouncil.org.uk/docs.html > Cumbria Amenity Trust Mining History Society https://www.catmhs.org.uk/past-newsletters/ > Mining Heritage Trust of Ireland Journal https://www.mhti.ie/mhti-journals.html > Mining Heritage Trust of Ireland Newsletter https://www.mhti.ie/mhti-newsletters.html > Shropshire Caving and Mining Club https://www.shropshirecmc.org.uk/below.html > Caban https://www.train4underground.co.uk/caban-magazines-available-online/ > Welsh Mines Society https://www.welshmines.org/previousnewsletters > Adventure Traveller https://www.youtube.com/@adventuretraveller007 > Ben o Cam https://www.youtube.com/@BenoCam > Sid Perou https://www.youtube.com/@Cavingcameraman > Cornwall Underground https://www.youtube.com/@cornwallundergroundadventu6328 > David Webb https://www.youtube.com/@davidwebb5674 > Friends of Williamson's Tunnels https://www.youtube.com/@Friends-of-Williamsons-Tunnels > Hidden Earth https://www.youtube.com/@HiddenEarthVideoArchive > Days of Darkness - Cornwall https://www.youtube.com/@Into-the-Silence/videos > Lost Mines https://www.youtube.com/@LostMines > Rossendale Collieries: Northern Industrial History https://www.youtube.com/@rossendalecollieries7995 > Shonky Tours https://www.youtube.com/@shonkytours2039 > Tecopa Mines https://www.youtube.com/@tecopamines > Underground Explorer UK https://www.youtube.com/@UndergroundExplorerUK > Yorkshire Subterranean Society https://www.yssuk.com/yss/newsletters.html > York Caving Club https://yorkcavingclub.org.uk/publications 14:14:01 PROCESS COMPLETE.

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19\",\"date\":\"1923-05-10\"},{\"title\":\"Coal Age 1923-06-07: Vol 23 Iss 23\",\"date\":\"1923-06-07\"},{\"title\":\"Coal Age 1921-03-31: Vol 19 Iss 13\",\"date\":\"1921-03-31\"},{\"title\":\"Coal Age 1924-10-09: Vol 26 Iss 15\",\"date\":\"1924-10-09\"},{\"title\":\"Coal Age 1926-10-14: Vol 30 Iss 16\",\"date\":\"1926-10-14\"},{\"title\":\"Coal Age 1927-01-27: Vol 31 Iss 4\",\"date\":\"1927-01-27\"},{\"title\":\"Coal Age 1930-10: Vol 35 Iss 10\",\"date\":\"1930-10-01\"},{\"title\":\"Coal Age 1937-06: Vol 42 Iss 6\",\"date\":\"1937-06-01\"},{\"title\":\"Coal Age 1938-10: Vol 43 Iss 10\",\"date\":\"1938-10-01\"},{\"title\":\"Coal Age 1939-12: Vol 44 Iss 12\",\"date\":\"1939-12-01\"},{\"title\":\"Coal Age 1940-03: Vol 45 Iss 3\",\"date\":\"1940-03-01\"},{\"title\":\"Coal Age 1945-01: Vol 50 Iss 1\",\"date\":\"1945-01-01\"},{\"title\":\"Coal Age 1945-02: Vol 50 Iss 2\",\"date\":\"1945-02-01\"},{\"title\":\"Coal Age 1952-05: Vol 57 Iss 5\",\"date\":\"1952-05-01\"},{\"title\":\"Coal Age 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1923-06-21: Vol 23 Iss 25\",\"date\":\"1923-06-21\"},{\"title\":\"Coal Age 1921-04-07: Vol 19 Iss 14\",\"date\":\"1921-04-07\"},{\"title\":\"Coal Age 1921-04-28: Vol 19 Iss 17\",\"date\":\"1921-04-28\"},{\"title\":\"Coal Age 1924-03-27: Vol 25 Iss 13\",\"date\":\"1924-03-27\"},{\"title\":\"Coal Age 1924-11-13: Vol 26 Iss 20\",\"date\":\"1924-11-13\"},{\"title\":\"Coal Age 1924-11-20: Vol 26 Iss 21\",\"date\":\"1924-11-20\"},{\"title\":\"Coal Age 1927-01-13: Vol 31 Iss 2\",\"date\":\"1927-01-13\"},{\"title\":\"Coal Age 1930-01: Vol 35 Iss 1\",\"date\":\"1930-01-01\"},{\"title\":\"Coal Age 1930-07: Vol 35 Iss 7\",\"date\":\"1930-07-01\"},{\"title\":\"Coal Age 1931-03: Vol 36 Iss 3\",\"date\":\"1931-03-01\"},{\"title\":\"Coal Age 1931-05: Vol 36 Iss 5\",\"date\":\"1931-05-01\"},{\"title\":\"Coal Age 1934-04: Vol 39 Iss 4\",\"date\":\"1934-04-01\"},{\"title\":\"Coal Age 1947-03: Vol 52 Iss 3\",\"date\":\"1947-03-01\"},{\"title\":\"Coal Age 1953-02: Vol 58 Iss 2\",\"date\":\"1953-02-01\"},{\"title\":\"Coal Age 1957-06: Vol 62 Iss 6\",\"date\":\"1957-06-01\"},{\"title\":\"Coal Age 1916-04-08: Vol 9 Iss 15\",\"date\":\"1916-04-08\"},{\"title\":\"Coal Age 1916-06-17: Vol 9 Iss 25\",\"date\":\"1916-06-17\"},{\"title\":\"Coal Age 1916-12-23: Vol 10 Iss 26\",\"date\":\"1916-12-23\"},{\"title\":\"Coal Age 1917-01-13: Vol 11 Iss 2\",\"date\":\"1917-01-13\"},{\"title\":\"Coal Age 1917-02-17: Vol 11 Iss 7\",\"date\":\"1917-02-17\"},{\"title\":\"Coal Age 1917-08-25: Vol 12 Iss 8\",\"date\":\"1917-08-25\"},{\"title\":\"Coal Age 1918-05-18: Vol 13 Iss 20\",\"date\":\"1918-05-18\"},{\"title\":\"Coal Age 1918-10-24: Vol 14 Iss 17\",\"date\":\"1918-10-24\"},{\"title\":\"Coal Age 1919-05-08: Vol 15 Iss 19\",\"date\":\"1919-05-08\"},{\"title\":\"Coal Age 1920-09-16: Vol 18 Iss 12\",\"date\":\"1920-09-16\"},{\"title\":\"Coal Age 1921-11-10: Vol 20 Iss 19\",\"date\":\"1921-11-10\"},{\"title\":\"Coal Age 1922-03-02: Vol 21 Iss 9\",\"date\":\"1922-03-02\"},{\"title\":\"Coal Age 1922-07-20: Vol 22 Iss 3\",\"date\":\"1922-07-20\"},{\"title\":\"Coal Age 1922-08-31: Vol 22 Iss 9\",\"date\":\"1922-08-31\"},{\"title\":\"Coal Age 1938-08: Vol 43 Iss 8\",\"date\":\"1938-08-01\"},{\"title\":\"Coal Age 1940-09: Vol 45 Iss 9\",\"date\":\"1940-09-01\"},{\"title\":\"Coal Age 1945-10: Vol 50 Iss 10\",\"date\":\"1945-10-01\"},{\"title\":\"Coal Age 1915-11-27: Vol 8 Iss 22\",\"date\":\"1915-11-27\"},{\"title\":\"Coal Age 1920-02-05: Vol 17 Iss 6\",\"date\":\"1920-02-05\"},{\"title\":\"Coal Age 1929-10: Vol 34 Iss 10\",\"date\":\"1929-10-01\"},{\"title\":\"Coal Age 1933-07: Vol 38 Iss 7\",\"date\":\"1933-07-01\"},{\"title\":\"Coal Age 1933-10: Vol 38 Iss 10\",\"date\":\"1933-10-01\"},{\"title\":\"Coal Age 1934-03: Vol 39 Iss 3\",\"date\":\"1934-03-01\"},{\"title\":\"Coal Age 1937-03: Vol 42 Iss 3\",\"date\":\"1937-03-01\"},{\"title\":\"Coal Age 1959-01: Vol 64 Iss 1\",\"date\":\"1959-01-01\"},{\"title\":\"Coal Age 1913-02-22: Vol 3 Iss 8\",\"date\":\"1913-02-22\"},{\"title\":\"Coal Age 1913-09-20: Vol 4 Iss 12\",\"date\":\"1913-09-20\"},{\"title\":\"Coal Age 1916-04-01: Vol 9 Iss 14\",\"date\":\"1916-04-01\"},{\"title\":\"Coal Age 1916-08-05: Vol 10 Iss 6\",\"date\":\"1916-08-05\"},{\"title\":\"Coal Age 1918-10-03: Vol 14 Iss 14\",\"date\":\"1918-10-03\"},{\"title\":\"Coal Age 1919-01-23: Vol 15 Iss 4\",\"date\":\"1919-01-23\"},{\"title\":\"Coal Age 1919-04-24: Vol 15 Iss 17\",\"date\":\"1919-04-24\"},{\"title\":\"Coal Age 1921-11-03: Vol 20 Iss 18\",\"date\":\"1921-11-03\"},{\"title\":\"Coal Age 1922-03-23: Vol 21 Iss 12\",\"date\":\"1922-03-23\"},{\"title\":\"Coal Age 1922-10-26: Vol 22 Iss 17\",\"date\":\"1922-10-26\"},{\"title\":\"Coal Age 1940-08: Vol 45 Iss 8\",\"date\":\"1940-08-01\"},{\"title\":\"Coal Age 1947: Vol 52 Index\",\"date\":\"1947-01-01\"},{\"title\":\"Coal Age 1951-08: Vol 56 Iss 8\",\"date\":\"1951-08-01\"},{\"title\":\"Coal Age 1920-05-27: Vol 17 Iss 22\",\"date\":\"1920-05-27\"},{\"title\":\"Coal Age 1933-09: Vol 38 Iss 9\",\"date\":\"1933-09-01\"},{\"title\":\"Coal Age 1937-08: Vol 42 Iss 8\",\"date\":\"1937-08-01\"},{\"title\":\"Coal Age January-June 1921: Vol 19 Index\",\"date\":\"1921-01-01\"},{\"title\":\"Coal Age 1915-06-19: Vol 7 Iss 25\",\"date\":\"1915-06-19\"},{\"title\":\"Coal Age 1918-08-08: Vol 14 Iss 6\",\"date\":\"1918-08-08\"},{\"title\":\"Coal Age 1919-05-22: Vol 15 Iss 21\",\"date\":\"1919-05-22\"},{\"title\":\"Coal Age 1951-04: Vol 56 Iss 4\",\"date\":\"1951-04-01\"},{\"title\":\"Coal Age 1915-11-20: Vol 8 Iss 21\",\"date\":\"1915-11-20\"},{\"title\":\"Coal Age 1913-11-01: Vol 4 Iss 18\",\"date\":\"1913-11-01\"},{\"title\":\"Coal Age 1938-06: Vol 43 Iss 6\",\"date\":\"1938-06-01\"},{\"title\":\"Coal Age 1954-06: Vol 59 Iss 6\",\"date\":\"1954-06-01\"},{\"title\":\"Coal Age 1954-07: Vol 59 Iss 7\",\"date\":\"1954-07-01\"},{\"title\":\"Coal Age 1955-01: Vol 60 Iss 1\",\"date\":\"1955-01-01\"},{\"title\":\"Coal Age 1956-04: Vol 61 Iss 4\",\"date\":\"1956-04-01\"},{\"title\":\"Coal Age 1957-10: Vol 62 Iss 10\",\"date\":\"1957-10-01\"},{\"title\":\"Coal Age 1927-01-06: Vol 31 Iss 1\",\"date\":\"1927-01-06\"},{\"title\":\"Coal Age 1927-01-20: Vol 31 Iss 3\",\"date\":\"1927-01-20\"},{\"title\":\"Coal Age 1927-03-24: Vol 31 Iss 12\",\"date\":\"1927-03-24\"},{\"title\":\"Coal Age 1924-12-11: Vol 26 Iss 24\",\"date\":\"1924-12-11\"},{\"title\":\"Coal Age 1925-01-15: Vol 27 Iss 3\",\"date\":\"1925-01-15\"},{\"title\":\"Coal Age 1942-11: Vol 47 Iss 11\",\"date\":\"1942-11-01\"},{\"title\":\"Coal Age 1943-08: Vol 48 Iss 8\",\"date\":\"1943-08-01\"},{\"title\":\"Coal Age 1949-03: Vol 54 Iss 3\",\"date\":\"1949-03-01\"},{\"title\":\"Coal Age 1914-02-07: Vol 5 Iss 6\",\"date\":\"1914-02-07\"},{\"title\":\"Coal Age 1915-10-02: Vol 8 Iss 14\",\"date\":\"1915-10-02\"},{\"title\":\"Coal Age 1916-09-16: Vol 10 Iss 12\",\"date\":\"1916-09-16\"},{\"title\":\"Coal Age 1922-06-01: Vol 21 Iss 22\",\"date\":\"1922-06-01\"},{\"title\":\"Coal Age 1917-01-06: Vol 11 Iss 1\",\"date\":\"1917-01-06\"},{\"title\":\"Coal Age 1917-11-10: Vol 12 Iss 19\",\"date\":\"1917-11-10\"},{\"title\":\"Coal Age 1918-02-16: Vol 13 Iss 7\",\"date\":\"1918-02-16\"},{\"title\":\"Coal Age 1925-07-02: Vol 28 Iss 1\",\"date\":\"1925-07-02\"},{\"title\":\"Coal Age 1926-02-04: Vol 29 Iss 5\",\"date\":\"1926-02-04\"},{\"title\":\"Coal Age 1926-10-07: Vol 30 Iss 15\",\"date\":\"1926-10-07\"},{\"title\":\"Coal Age 1926-11-11: Vol 30 Iss 20\",\"date\":\"1926-11-11\"},{\"title\":\"Coal Age 1957-01: Vol 62 Iss 1\",\"date\":\"1957-01-01\"},{\"title\":\"Coal Age 1921-01-13: Vol 19 Iss 2\",\"date\":\"1921-01-13\"},{\"title\":\"Coal Age January-December 1956: Vol 61 Index\",\"date\":\"1956-01-01\"},{\"title\":\"Coal Age 1952-07: Vol 57 Iss 7\",\"date\":\"1952-07-01\"},{\"title\":\"Coal Age 1911-11-18: Vol 1 Iss 6\",\"date\":\"1911-11-18\"},{\"title\":\"Coal Age 1912-04-13: Vol 1 Iss 27\",\"date\":\"1912-04-13\"},{\"title\":\"Coal Age 1916-09-23: Vol 10 Iss 13\",\"date\":\"1916-09-23\"},{\"title\":\"Coal Age 1922-05-18: Vol 21 Iss 20\",\"date\":\"1922-05-18\"},{\"title\":\"Coal Age 1925-12-24: Vol 28 Iss 26\",\"date\":\"1925-12-24\"},{\"title\":\"Coal Age 1923-09-27: Vol 24 Iss 13\",\"date\":\"1923-09-27\"},{\"title\":\"Coal Age 1924-06-19: Vol 25 Iss 25\",\"date\":\"1924-06-19\"},{\"title\":\"Coal Age 1936-04: Vol 41 Iss 4\",\"date\":\"1936-04-01\"},{\"title\":\"Coal Age 1939-04: Vol 44 Iss 4\",\"date\":\"1939-04-01\"},{\"title\":\"Coal Age 1917-07-28: Vol 12 Iss 4\",\"date\":\"1917-07-28\"},{\"title\":\"Coal Age 1918-06-01: Vol 13 Iss 22\",\"date\":\"1918-06-01\"},{\"title\":\"Coal Age 1941-12: Vol 46 Iss 12\",\"date\":\"1941-12-01\"},{\"title\":\"Coal Age 1948-09: Vol 53 Iss 9\",\"date\":\"1948-09-01\"},{\"title\":\"Coal Age 1951-03: Vol 56 Iss 3\",\"date\":\"1951-03-01\"},{\"title\":\"Coal Age 1961-12: Vol 66 Iss 12\",\"date\":\"1961-12-01\"},{\"title\":\"Coal Age 1967: Vol 72 Index\",\"date\":\"1967-01-01\"},{\"title\":\"Coal Age 1945-06: Vol 50 Iss 6\",\"date\":\"1945-06-01\"},{\"title\":\"Coal Age 1911-12-02: Vol 1 Iss 8\",\"date\":\"1911-12-02\"},{\"title\":\"Coal Age 1916-01-08: Vol 9 Iss 2\",\"date\":\"1916-01-08\"},{\"title\":\"Coal Age 1917-03-10: Vol 11 Iss 10\",\"date\":\"1917-03-10\"},{\"title\":\"Coal Age 1915-06-26: Vol 7 Iss 26\",\"date\":\"1915-06-26\"},{\"title\":\"Coal Age 1917-05-05: Vol 11 Iss 18\",\"date\":\"1917-05-05\"},{\"title\":\"Coal Age 1918-05-11: Vol 13 Iss 19\",\"date\":\"1918-05-11\"},{\"title\":\"Coal Age 1918-10-10: Vol 14 Iss 15\",\"date\":\"1918-10-10\"},{\"title\":\"Coal Age 1921-09-22: Vol 20 Iss 12\",\"date\":\"1921-09-22\"},{\"title\":\"Coal Age 1924-11-06: Vol 26 Iss 19\",\"date\":\"1924-11-06\"},{\"title\":\"Coal Age 1924-12-18: Vol 26 Iss 25\",\"date\":\"1924-12-18\"},{\"title\":\"Coal Age 1925-02-19: Vol 27 Iss 8\",\"date\":\"1925-02-19\"},{\"title\":\"Coal Age 1925-10-22: Vol 28 Iss 17\",\"date\":\"1925-10-22\"},{\"title\":\"Coal Age 1926-08-19: Vol 30 Iss 8\",\"date\":\"1926-08-19\"},{\"title\":\"Coal Age 1927-04-07: Vol 31 Iss 14\",\"date\":\"1927-04-07\"},{\"title\":\"Coal Age 1944-04: Vol 49 Iss 4\",\"date\":\"1944-04-01\"},{\"title\":\"Coal Age 1953-03: Vol 58 Iss 3\",\"date\":\"1953-03-01\"},{\"title\":\"Coal Age 1912-09-14: Vol 2 Iss 11\",\"date\":\"1912-09-14\"},{\"title\":\"Coal Age 1913-02-01: Vol 3 Iss 5\",\"date\":\"1913-02-01\"},{\"title\":\"Coal Age 1914-05-16: Vol 5 Iss 20\",\"date\":\"1914-05-16\"},{\"title\":\"Coal Age 1914-09-12: Vol 6 Iss 11\",\"date\":\"1914-09-12\"},{\"title\":\"Coal Age 1921-11-17: Vol 20 Iss 20\",\"date\":\"1921-11-17\"},{\"title\":\"Coal Age 1922-04-27: Vol 21 Iss 17\",\"date\":\"1922-04-27\"},{\"title\":\"Coal Age 1923-01-04: Vol 23 Iss 1\",\"date\":\"1923-01-04\"},{\"title\":\"Coal Age 1941-01: Vol 46 Iss 1\",\"date\":\"1941-01-01\"},{\"title\":\"Coal Age 1947-09: Vol 52 Iss 9\",\"date\":\"1947-09-01\"},{\"title\":\"Coal Age 1947-11: Vol 52 Iss 11\",\"date\":\"1947-11-01\"},{\"title\":\"Coal Age 1956-08: Vol 61 Iss 8\",\"date\":\"1956-08-01\"},{\"title\":\"Coal Age 1919-07-10: Vol 16 Iss 2\",\"date\":\"1919-07-10\"},{\"title\":\"Coal Age 1919-09-11: Vol 16 Iss 11\",\"date\":\"1919-09-11\"},{\"title\":\"Coal Age 1929-03: Vol 34 Iss 3\",\"date\":\"1929-03-01\"},{\"title\":\"Coal Age 1929-09: Vol 34 Iss 9\",\"date\":\"1929-09-01\"},{\"title\":\"Coal Age 1929-11: Vol 34 Iss 11\",\"date\":\"1929-11-01\"},{\"title\":\"Coal Age 1934-06: Vol 39 Iss 6\",\"date\":\"1934-06-01\"},{\"title\":\"Coal Age 1970: Vol 75 Index\",\"date\":\"1970-01-01\"},{\"title\":\"Coal Age January 01-June 30, 1926: Vol 29 Index\",\"date\":\"1926-01-01\"},{\"title\":\"Coal Age January-December 1928: Vol 33 Index\",\"date\":\"1928-01-01\"},{\"title\":\"Coal Age January-December 1929: Vol 34 Index\",\"date\":\"1929-01-01\"},{\"title\":\"Coal Age July 01-December 31, 1925: Vol 28 Index\",\"date\":\"1925-07-01\"},{\"title\":\"Coal Age 1913-02-08: Vol 3 Iss 6\",\"date\":\"1913-02-08\"},{\"title\":\"Coal Age 1919-08-21: Vol 16 Iss 8\",\"date\":\"1919-08-21\"},{\"title\":\"Coal Age 1919-03-06: Vol 15 Iss 10\",\"date\":\"1919-03-06\"},{\"title\":\"Coal Age 1920-12-23: Vol 18 Iss 26\",\"date\":\"1920-12-23\"},{\"title\":\"Coal Age 1918-07-20: Vol 14 Iss 3\",\"date\":\"1918-07-20\"},{\"title\":\"Coal Age 1919-10-02: Vol 16 Iss 14\",\"date\":\"1919-10-02\"},{\"title\":\"Coal Age 1925-08-27: Vol 28 Iss 9\",\"date\":\"1925-08-27\"},{\"title\":\"Coal Age 1925-12-31: Vol 28 Iss 27\",\"date\":\"1925-12-31\"},{\"title\":\"Coal Age 1926-05-06: Vol 29 Iss 18\",\"date\":\"1926-05-06\"},{\"title\":\"Coal Age 1926-07-01: Vol 30 Iss 1\",\"date\":\"1926-07-01\"},{\"title\":\"Coal Age 1927-06-16: Vol 31 Iss 24\",\"date\":\"1927-06-16\"},{\"title\":\"Coal Age 1922-12-28: Vol 22 Iss 26\",\"date\":\"1922-12-28\"},{\"title\":\"Coal Age 1923-09-20: Vol 24 Iss 12\",\"date\":\"1923-09-20\"},{\"title\":\"Coal Age 1924-07-17: Vol 26 Iss 3\",\"date\":\"1924-07-17\"},{\"title\":\"Coal Age 1925-04-30: Vol 27 Iss 18\",\"date\":\"1925-04-30\"},{\"title\":\"Coal Age 1944: Vol 49 Index\",\"date\":\"1944-01-01\"},{\"title\":\"Coal Age 1945-09: Vol 50 Iss 9\",\"date\":\"1945-09-01\"},{\"title\":\"Coal Age 1960-03: Vol 65 Iss 3\",\"date\":\"1960-03-01\"},{\"title\":\"Coal Age 1960-12: Vol 65 Iss 12\",\"date\":\"1960-12-01\"},{\"title\":\"Coal Age 1961-02: Vol 66 Iss 2\",\"date\":\"1961-02-01\"},{\"title\":\"Coal Age 1961-03: Vol 66 Iss 3\",\"date\":\"1961-03-01\"},{\"title\":\"Coal Age January-December 1957: Vol 62 Index\",\"date\":\"1957-01-01\"},{\"title\":\"Coal Age January-December 1963: Vol 68 Index\",\"date\":\"1963-01-01\"},{\"title\":\"Coal Age 1914-12-12: Vol 6 Iss 24\",\"date\":\"1914-12-12\"},{\"title\":\"Coal Age 1915-05-22: Vol 7 Iss 21\",\"date\":\"1915-05-22\"},{\"title\":\"Coal Age 1931-02: Vol 36 Iss 2\",\"date\":\"1931-02-01\"},{\"title\":\"Coal Age 1931-07: Vol 36 Iss 7\",\"date\":\"1931-07-01\"},{\"title\":\"Coal Age 1935-05: Vol 40 Iss 5\",\"date\":\"1935-05-01\"},{\"title\":\"Coal Age 1937-11: Vol 42 Iss 11\",\"date\":\"1937-11-01\"},{\"title\":\"Coal Age 1938-05: Vol 43 Iss 5\",\"date\":\"1938-05-01\"},{\"title\":\"Coal Age 1953-08: Vol 58 Iss 8\",\"date\":\"1953-08-01\"},{\"title\":\"Coal Age 1955-05: Vol 60 Iss 5\",\"date\":\"1955-05-01\"},{\"title\":\"Coal Age 1959-02: Vol 64 Iss 2\",\"date\":\"1959-02-01\"},{\"title\":\"Coal Age 1914-04-25: Vol 5 Iss 17\",\"date\":\"1914-04-25\"},{\"title\":\"Coal Age 1914-08-22: Vol 6 Iss 8\",\"date\":\"1914-08-22\"},{\"title\":\"Coal Age 1916-12-30: Vol 10 Iss 27\",\"date\":\"1916-12-30\"},{\"title\":\"Coal Age 1920-04-08: Vol 17 Iss 15\",\"date\":\"1920-04-08\"},{\"title\":\"Coal Age 1922-01-12: Vol 21 Iss 2\",\"date\":\"1922-01-12\"},{\"title\":\"Coal Age 1922-11-23: Vol 22 Iss 21\",\"date\":\"1922-11-23\"},{\"title\":\"Coal Age 1924-11-27: Vol 26 Iss 22\",\"date\":\"1924-11-27\"},{\"title\":\"Coal Age 1925-08-13: Vol 28 Iss 7\",\"date\":\"1925-08-13\"},{\"title\":\"Coal Age 1925-11-19: Vol 28 Iss 21\",\"date\":\"1925-11-19\"},{\"title\":\"Coal Age 1926-01-28: Vol 29 Iss 4\",\"date\":\"1926-01-28\"},{\"title\":\"Coal Age 1926-02-25: Vol 29 Iss 8\",\"date\":\"1926-02-25\"},{\"title\":\"Coal Age 1937-12: Vol 42 Iss 12\",\"date\":\"1937-12-01\"},{\"title\":\"Coal Age 1941-09: Vol 46 Iss 9\",\"date\":\"1941-09-01\"},{\"title\":\"Coal Age 1917-06-09: Vol 11 Iss 23\",\"date\":\"1917-06-09\"},{\"title\":\"Coal Age 1917-10-27: Vol 12 Iss 17\",\"date\":\"1917-10-27\"},{\"title\":\"Coal Age 1932-04: Vol 37 Iss 4\",\"date\":\"1932-04-01\"},{\"title\":\"Coal Age 1932-09: Vol 37 Iss 9\",\"date\":\"1932-09-01\"},{\"title\":\"Coal Age 1912-10-12: Vol 2 Iss 15\",\"date\":\"1912-10-12\"},{\"title\":\"Coal Age 1913-07-19: Vol 4 Iss 3\",\"date\":\"1913-07-19\"},{\"title\":\"Coal Age 1911-10-28: Vol 1 Iss 3\",\"date\":\"1911-10-28\"},{\"title\":\"Coal Age 1915-04-17: Vol 7 Iss 16\",\"date\":\"1915-04-17\"},{\"title\":\"Coal Age 1915-10-09: Vol 8 Iss 15\",\"date\":\"1915-10-09\"},{\"title\":\"Coal Age 1919-02-13: Vol 15 Iss 7\",\"date\":\"1919-02-13\"},{\"title\":\"Coal Age 1920-11-04: Vol 18 Iss 19\",\"date\":\"1920-11-04\"},{\"title\":\"Coal Age 1921-05-05: Vol 19 Iss 18\",\"date\":\"1921-05-05\"},{\"title\":\"Coal Age 1927-06-09: Vol 31 Iss 23\",\"date\":\"1927-06-09\"},{\"title\":\"Coal Age 1931-04: Vol 36 Iss 4\",\"date\":\"1931-04-01\"},{\"title\":\"Coal Age 1947-05: Vol 52 Iss 5\",\"date\":\"1947-05-01\"},{\"title\":\"Coal Age 1951-02: Vol 56 Iss 2\",\"date\":\"1951-02-01\"},{\"title\":\"Coal Age 1944-09: Vol 49 Iss 9\",\"date\":\"1944-09-01\"},{\"title\":\"Coal Age 1957-09: Vol 62 Iss 9\",\"date\":\"1957-09-01\"},{\"title\":\"Coal Age 1960-02: Vol 65 Iss 2\",\"date\":\"1960-02-01\"},{\"title\":\"Coal Age 1912-01-13: Vol 1 Iss 14\",\"date\":\"1912-01-13\"},{\"title\":\"Coal Age 1912-06-29: Vol 1 Iss 38\",\"date\":\"1912-06-29\"},{\"title\":\"Coal Age 1912-08-03: Vol 2 Iss 5\",\"date\":\"1912-08-03\"},{\"title\":\"Coal Age 1913-05-10: Vol 3 Iss 19\",\"date\":\"1913-05-10\"},{\"title\":\"Coal Age 1913-06-07: Vol 3 Iss 23\",\"date\":\"1913-06-07\"},{\"title\":\"Coal Age 1920-06-17: Vol 17 Iss 25\",\"date\":\"1920-06-17\"},{\"title\":\"Coal Age 1921-03-17: Vol 19 Iss 11\",\"date\":\"1921-03-17\"},{\"title\":\"Coal Age 1922-03-16: Vol 21 Iss 11\",\"date\":\"1922-03-16\"},{\"title\":\"Coal Age 1922-06-08: Vol 21 Iss 23\",\"date\":\"1922-06-08\"},{\"title\":\"Coal Age 1928-11: Vol 33 Iss 11\",\"date\":\"1928-11-01\"},{\"title\":\"Coal Age 1931-11: Vol 36 Iss 11\",\"date\":\"1931-11-01\"},{\"title\":\"Coal Age 1935-12: Vol 40 Iss 12\",\"date\":\"1935-12-01\"},{\"title\":\"Coal Age 1939-01: Vol 44 Iss 1\",\"date\":\"1939-01-01\"},{\"title\":\"Coal Age 1955-07: Vol 60 Iss 7\",\"date\":\"1955-07-01\"},{\"title\":\"Coal Age 1955-10: Vol 60 Iss 10\",\"date\":\"1955-10-01\"},{\"title\":\"Coal Age 1959-07: Vol 64 Iss 7\",\"date\":\"1959-07-01\"},{\"title\":\"Coal Age 1914-06-27: Vol 5 Iss 26\",\"date\":\"1914-06-27\"},{\"title\":\"Coal Age 1914-12-19: Vol 6 Iss 25\",\"date\":\"1914-12-19\"},{\"title\":\"Coal Age 1914: Vol 6 Index\",\"date\":\"1914-01-01\"},{\"title\":\"Coal Age 1916-11-18: Vol 10 Iss 21\",\"date\":\"1916-11-18\"},{\"title\":\"Coal Age 1917-04-07: Vol 11 Iss 14\",\"date\":\"1917-04-07\"},{\"title\":\"Coal Age 1924-01-03: Vol 25 Iss 1\",\"date\":\"1924-01-03\"},{\"title\":\"Coal Age 1924-01-17: Vol 25 Iss 3\",\"date\":\"1924-01-17\"},{\"title\":\"Coal Age 1924-02-28: Vol 25 Iss 9\",\"date\":\"1924-02-28\"},{\"title\":\"Coal Age 1944-03: Vol 49 Iss 3\",\"date\":\"1944-03-01\"},{\"title\":\"Coal Age 1952-11: Vol 57 Iss 11\",\"date\":\"1952-11-01\"},{\"title\":\"Coal Age July 01-December 31, 1926: Vol 30 Index\",\"date\":\"1926-07-01\"},{\"title\":\"Coal Age 1918-04-20: Vol 13 Iss 16\",\"date\":\"1918-04-20\"},{\"title\":\"Coal Age 1944-07: Vol 49 Iss 7\",\"date\":\"1944-07-01\"},{\"title\":\"Coal Age 1945-03: Vol 50 Iss 3\",\"date\":\"1945-03-01\"},{\"title\":\"Coal Age 1945-12: Vol 50 Iss 12\",\"date\":\"1945-12-01\"},{\"title\":\"Coal Age 1949-06: Vol 54 Iss 6\",\"date\":\"1949-06-01\"},{\"title\":\"Coal Age 1950-02: Vol 55 Iss 2\",\"date\":\"1950-02-01\"},{\"title\":\"Coal Age 1961-11: Vol 66 Iss 11\",\"date\":\"1961-11-01\"},{\"title\":\"Coal Age 1916-10-28: Vol 10 Iss 18\",\"date\":\"1916-10-28\"},{\"title\":\"Coal Age 1920-06-24: Vol 17 Iss 26\",\"date\":\"1920-06-24\"},{\"title\":\"Coal Age 1921-02-17: Vol 19 Iss 7\",\"date\":\"1921-02-17\"},{\"title\":\"Coal Age 1921-09-29: Vol 20 Iss 13\",\"date\":\"1921-09-29\"},{\"title\":\"Coal Age 1922-05-11: Vol 21 Iss 19\",\"date\":\"1922-05-11\"},{\"title\":\"Coal Age 1926-01-07: Vol 29 Iss 1\",\"date\":\"1926-01-07\"},{\"title\":\"Coal Age 1926-05-27: Vol 29 Iss 21\",\"date\":\"1926-05-27\"},{\"title\":\"Coal Age 1926-09-30: Vol 30 Iss 14\",\"date\":\"1926-09-30\"},{\"title\":\"Coal Age 1927-02-03: Vol 31 Iss 5\",\"date\":\"1927-02-03\"},{\"title\":\"Coal Age 1927-07: Vol 32 Iss 1\",\"date\":\"1927-07-01\"},{\"title\":\"Coal Age 1922-12-07: Vol 22 Iss 23\",\"date\":\"1922-12-07\"},{\"title\":\"Coal Age 1923-03-01: Vol 23 Iss 9\",\"date\":\"1923-03-01\"},{\"title\":\"Coal Age 1924-07-31: Vol 26 Iss 5\",\"date\":\"1924-07-31\"},{\"title\":\"Coal Age 1925-05-21: Vol 27 Iss 21\",\"date\":\"1925-05-21\"},{\"title\":\"Coal Age 1930-03: Vol 35 Iss 3\",\"date\":\"1930-03-01\"},{\"title\":\"Coal Age 1932-05: Vol 37 Iss 5\",\"date\":\"1932-05-01\"},{\"title\":\"Coal Age 1937-09: Vol 42 Iss 9\",\"date\":\"1937-09-01\"},{\"title\":\"Coal Age 1954-12: Vol 59 Iss 12\",\"date\":\"1954-12-01\"},{\"title\":\"Coal Age 1956-06: Vol 61 Iss 6\",\"date\":\"1956-06-01\"},{\"title\":\"Coal Age 1912-05-11: Vol 1 Iss 31\",\"date\":\"1912-05-11\"},{\"title\":\"Coal Age 1913-04-05: Vol 3 Iss 14\",\"date\":\"1913-04-05\"},{\"title\":\"Coal Age 1920-04-01: Vol 17 Iss 14\",\"date\":\"1920-04-01\"},{\"title\":\"Coal Age 1920-05-20: Vol 17 Iss 21\",\"date\":\"1920-05-20\"},{\"title\":\"Coal Age 1920-09-02: Vol 18 Iss 10\",\"date\":\"1920-09-02\"},{\"title\":\"Coal Age 1922-10-05: Vol 22 Iss 14\",\"date\":\"1922-10-05\"},{\"title\":\"Coal Age 1922-11-30: Vol 22 Iss 22\",\"date\":\"1922-11-30\"},{\"title\":\"Coal Age 1923-05-03: Vol 23 Iss 18\",\"date\":\"1923-05-03\"},{\"title\":\"Coal Age 1923-10-11: Vol 24 Iss 15\",\"date\":\"1923-10-11\"},{\"title\":\"Coal Age 1923-12-27: Vol 24 Iss 26\",\"date\":\"1923-12-27\"},{\"title\":\"Coal Age 1943-05: Vol 48 Iss 5\",\"date\":\"1943-05-01\"},{\"title\":\"Coal Age 1946-03: Vol 51 Iss 3\",\"date\":\"1946-03-01\"},{\"title\":\"Coal Age 1946-09: Vol 51 Iss 9\",\"date\":\"1946-09-01\"},{\"title\":\"Coal Age 1951-06: Vol 56 Iss 6\",\"date\":\"1951-06-01\"},{\"title\":\"Coal Age 1955-03: Vol 60 Iss 3\",\"date\":\"1955-03-01\"},{\"title\":\"Coal Age 1956-02: Vol 61 Iss 2\",\"date\":\"1956-02-01\"},{\"title\":\"Coal Age 1915-05-29: Vol 7 Iss 22\",\"date\":\"1915-05-29\"},{\"title\":\"Coal Age 1915-09-11: Vol 8 Iss 11\",\"date\":\"1915-09-11\"},{\"title\":\"Coal Age 1916-05-20: Vol 9 Iss 21\",\"date\":\"1916-05-20\"},{\"title\":\"Coal Age 1919-10-16: Vol 16 Iss 16\",\"date\":\"1919-10-16\"},{\"title\":\"Coal Age 1926-04-22: Vol 29 Iss 16\",\"date\":\"1926-04-22\"},{\"title\":\"Coal Age 1926-12-16: Vol 30 Iss 25\",\"date\":\"1926-12-16\"},{\"title\":\"Coal Age 1934-10: Vol 39 Iss 10\",\"date\":\"1934-10-01\"},{\"title\":\"Coal Age 1936-11: Vol 41 Iss 11\",\"date\":\"1936-11-01\"},{\"title\":\"Coal Age 1941-08: Vol 46 Iss 8\",\"date\":\"1941-08-01\"},{\"title\":\"Coal Age 1959-12: Vol 64 Iss 12\",\"date\":\"1959-12-01\"},{\"title\":\"Coal Age 1915-05-15: Vol 7 Iss 20\",\"date\":\"1915-05-15\"},{\"title\":\"Coal Age 1915-06-12: Vol 7 Iss 24\",\"date\":\"1915-06-12\"},{\"title\":\"Coal Age 1920-04-22: Vol 17 Iss 17\",\"date\":\"1920-04-22\"},{\"title\":\"Coal Age 1953-06: Vol 58 Iss 6\",\"date\":\"1953-06-01\"},{\"title\":\"Coal Age 1917-01-20: Vol 11 Iss 3\",\"date\":\"1917-01-20\"},{\"title\":\"Coal Age 1917-01-27: Vol 11 Iss 4\",\"date\":\"1917-01-27\"},{\"title\":\"Coal Age 1943: Vol 48 Index\",\"date\":\"1943-01-01\"},{\"title\":\"Coal Age 1958-06: Vol 63 Iss 6\",\"date\":\"1958-06-01\"},{\"title\":\"Coal Age 1914-03-21: Vol 5 Iss 12\",\"date\":\"1914-03-21\"},{\"title\":\"Coal Age January-December 1958: Vol 63 Index\",\"date\":\"1958-01-01\"},{\"title\":\"Coal Age 1912-08-24: Vol 2 Iss 8\",\"date\":\"1912-08-24\"},{\"title\":\"Coal Age 1912-09-21: Vol 2 Iss 12\",\"date\":\"1912-09-21\"},{\"title\":\"Coal Age 1912-11-02: Vol 2 Iss 18\",\"date\":\"1912-11-02\"},{\"title\":\"Coal Age 1912-11-30: Vol 2 Iss 22\",\"date\":\"1912-11-30\"},{\"title\":\"Coal Age 1913-11-22: Vol 4 Iss 21\",\"date\":\"1913-11-22\"},{\"title\":\"Coal Age 1917-04-21: Vol 11 Iss 16\",\"date\":\"1917-04-21\"},{\"title\":\"Coal Age 1917-04-28: Vol 11 Iss 17\",\"date\":\"1917-04-28\"},{\"title\":\"Coal Age 1918-04-06: Vol 13 Iss 14\",\"date\":\"1918-04-06\"},{\"title\":\"Coal Age 1920-03-04: Vol 17 Iss 10\",\"date\":\"1920-03-04\"},{\"title\":\"Coal Age 1923-03-15: Vol 23 Iss 11\",\"date\":\"1923-03-15\"},{\"title\":\"Coal Age 1923-11-08: Vol 24 Iss 19\",\"date\":\"1923-11-08\"},{\"title\":\"Coal Age 1926-01-21: Vol 29 Iss 3\",\"date\":\"1926-01-21\"},{\"title\":\"Coal Age 1929-06: Vol 34 Iss 6\",\"date\":\"1929-06-01\"},{\"title\":\"Coal Age 1939-02: Vol 44 Iss 2\",\"date\":\"1939-02-01\"},{\"title\":\"Coal Age 1939-10: Vol 44 Iss 10\",\"date\":\"1939-10-01\"},{\"title\":\"Coal Age 1947-07: Vol 52 Iss 7\",\"date\":\"1947-07-01\"},{\"title\":\"Coal Age 1947-08: Vol 52 Iss 8\",\"date\":\"1947-08-01\"},{\"title\":\"Coal Age 1952-08: Vol 57 Iss 8\",\"date\":\"1952-08-01\"},{\"title\":\"Coal Age 1953-11: Vol 58 Iss 11\",\"date\":\"1953-11-01\"},{\"title\":\"Coal Age 1916-02-05: Vol 9 Iss 6\",\"date\":\"1916-02-05\"},{\"title\":\"Coal Age 1918: Vol 13 Index\",\"date\":\"1918-01-01\"},{\"title\":\"Coal Age 1919-01-09: Vol 15 Iss 2\",\"date\":\"1919-01-09\"},{\"title\":\"Coal Age 1921-12-08: Vol 20 Iss 23\",\"date\":\"1921-12-08\"},{\"title\":\"Coal Age 1922-08-03: Vol 22 Iss 5\",\"date\":\"1922-08-03\"},{\"title\":\"Coal Age 1920-09-23: Vol 18 Iss 13\",\"date\":\"1920-09-23\"},{\"title\":\"Coal Age 1920-10-14: Vol 18 Iss 16\",\"date\":\"1920-10-14\"},{\"title\":\"Coal Age 1921-05-12: Vol 19 Iss 19\",\"date\":\"1921-05-12\"},{\"title\":\"Coal Age 1921-06-30: Vol 19 Iss 26\",\"date\":\"1921-06-30\"},{\"title\":\"Coal Age 1924-03-06: Vol 25 Iss 10\",\"date\":\"1924-03-06\"},{\"title\":\"Coal Age 1924-03-13: Vol 25 Iss 11\",\"date\":\"1924-03-13\"},{\"title\":\"Coal Age 1924-04-03: Vol 25 Iss 14\",\"date\":\"1924-04-03\"},{\"title\":\"Coal Age 1924-04-10: Vol 25 Iss 15\",\"date\":\"1924-04-10\"},{\"title\":\"Coal Age 1924-05-08: Vol 25 Iss 19\",\"date\":\"1924-05-08\"},{\"title\":\"Coal Age 1924-08-07: Vol 26 Iss 6\",\"date\":\"1924-08-07\"},{\"title\":\"Coal Age 1926-07-15: Vol 30 Iss 3\",\"date\":\"1926-07-15\"},{\"title\":\"Coal Age 1933-04: Vol 38 Iss 4\",\"date\":\"1933-04-01\"},{\"title\":\"Coal Age 1934-01: Vol 39 Iss 1\",\"date\":\"1934-01-01\"},{\"title\":\"Coal Age 1942-02: Vol 47 Iss 2\",\"date\":\"1942-02-01\"},{\"title\":\"Coal Age July 01-December 31, 1923: Vol 24 Index\",\"date\":\"1923-07-01\"},{\"title\":\"Coal Age 1957-11: Vol 62 Iss 11\",\"date\":\"1957-11-01\"},{\"title\":\"Coal Age 1958-08: Vol 63 Iss 8\",\"date\":\"1958-08-01\"},{\"title\":\"Coal Age 1959-08: Vol 64 Iss 8\",\"date\":\"1959-08-01\"},{\"title\":\"Coal Age 1942-01: Vol 47 Iss 1\",\"date\":\"1942-01-01\"},{\"title\":\"Coal Age 1913-02-15: Vol 3 Iss 7\",\"date\":\"1913-02-15\"},{\"title\":\"Coal Age 1913-06-21: Vol 3 Iss 25\",\"date\":\"1913-06-21\"},{\"title\":\"Coal Age 1917-07-21: Vol 12 Iss 3\",\"date\":\"1917-07-21\"},{\"title\":\"Coal Age 1916-04-22: Vol 9 Iss 17\",\"date\":\"1916-04-22\"},{\"title\":\"Coal Age 1923-09-13: Vol 24 Iss 11\",\"date\":\"1923-09-13\"},{\"title\":\"Coal Age 1926-04-29: Vol 29 Iss 17\",\"date\":\"1926-04-29\"},{\"title\":\"Coal Age 1949-01: Vol 54 Iss 1\",\"date\":\"1949-01-01\"},{\"title\":\"Coal Age 1917-04-14: Vol 11 Iss 15\",\"date\":\"1917-04-14\"},{\"title\":\"Coal Age 1919-12-25: Vol 16 Iss 23\",\"date\":\"1919-12-25\"},{\"title\":\"Coal Age 1923-02-22: Vol 23 Iss 8\",\"date\":\"1923-02-22\"},{\"title\":\"Coal Age 1921-07-07: Vol 20 Iss 1\",\"date\":\"1921-07-07\"},{\"title\":\"Coal Age 1945-08: Vol 50 Iss 8\",\"date\":\"1945-08-01\"},{\"title\":\"Coal Age 1915-12-25: Vol 8 Iss 26\",\"date\":\"1915-12-25\"},{\"title\":\"Coal Age 1934-12: Vol 39 Iss 12\",\"date\":\"1934-12-01\"},{\"title\":\"Coal Age 1935-03: Vol 40 Iss 3\",\"date\":\"1935-03-01\"},{\"title\":\"Coal Age 1930-02: Vol 35 Iss 2\",\"date\":\"1930-02-01\"},{\"title\":\"Coal Age 1920-02-26: Vol 17 Iss 9\",\"date\":\"1920-02-26\"},{\"title\":\"Coal Age 1920: Vol 17 Index\",\"date\":\"1920-01-01\"},{\"title\":\"Coal Age 1922-03-09: Vol 21 Iss 10\",\"date\":\"1922-03-09\"},{\"title\":\"Coal Age 1927-05-05: Vol 31 Iss 18\",\"date\":\"1927-05-05\"},{\"title\":\"Coal Age 1927-05-19: Vol 31 Iss 20\",\"date\":\"1927-05-19\"},{\"title\":\"Coal Age 1961-01: Vol 66 Iss 1\",\"date\":\"1961-01-01\"},{\"title\":\"Coal Age 1912-05-04: Vol 1 Iss 30\",\"date\":\"1912-05-04\"},{\"title\":\"Coal Age 1913-05-17: Vol 3 Iss 20\",\"date\":\"1913-05-17\"},{\"title\":\"Coal Age 1913-12-13: Vol 4 Iss 24\",\"date\":\"1913-12-13\"},{\"title\":\"Coal Age 1919-10-09: Vol 16 Iss 15\",\"date\":\"1919-10-09\"},{\"title\":\"Coal Age 1920-01-29: Vol 17 Iss 5\",\"date\":\"1920-01-29\"},{\"title\":\"Coal Age 1923-08-23: Vol 24 Iss 8\",\"date\":\"1923-08-23\"},{\"title\":\"Coal Age 1923-11-22: Vol 24 Iss 21\",\"date\":\"1923-11-22\"},{\"title\":\"Coal Age 1930-12: Vol 35 Iss 12\",\"date\":\"1930-12-01\"},{\"title\":\"Coal Age 1936-06: Vol 41 Iss 6\",\"date\":\"1936-06-01\"},{\"title\":\"Coal Age 1944-12: Vol 49 Iss 12\",\"date\":\"1944-12-01\"},{\"title\":\"Coal Age 1953-07: Vol 58 Iss 7\",\"date\":\"1953-07-01\"},{\"title\":\"Coal Age 1953-10: Vol 58 Iss 10\",\"date\":\"1953-10-01\"},{\"title\":\"Coal Age 1954-08: Vol 59 Iss 8\",\"date\":\"1954-08-01\"},{\"title\":\"Coal Age 1954-10: Vol 59 Iss 10\",\"date\":\"1954-10-01\"},{\"title\":\"Coal Age 1959-05: Vol 64 Iss 5\",\"date\":\"1959-05-01\"},{\"title\":\"Coal Age 1959-06: Vol 64 Iss 6\",\"date\":\"1959-06-01\"},{\"title\":\"Coal Age 1915-10-30: Vol 8 Iss 18\",\"date\":\"1915-10-30\"},{\"title\":\"Coal Age 1916-03-11: Vol 9 Iss 11\",\"date\":\"1916-03-11\"},{\"title\":\"Coal Age 1916-07-08: Vol 10 Iss 2\",\"date\":\"1916-07-08\"},{\"title\":\"Coal Age 1916-12-02: Vol 10 Iss 23\",\"date\":\"1916-12-02\"},{\"title\":\"Coal Age 1918-03-02: Vol 13 Iss 9\",\"date\":\"1918-03-02\"},{\"title\":\"Coal Age 1918-06-15: Vol 13 Iss 24\",\"date\":\"1918-06-15\"},{\"title\":\"Coal Age 1918-09-05: Vol 14 Iss 10\",\"date\":\"1918-09-05\"},{\"title\":\"Coal Age 1918-09-26: Vol 14 Iss 13\",\"date\":\"1918-09-26\"},{\"title\":\"Coal Age 1919-01-02: Vol 15 Iss 1\",\"date\":\"1919-01-02\"},{\"title\":\"Coal Age 1919: Vol 16 Index\",\"date\":\"1919-01-01\"},{\"title\":\"Coal Age 1920-01-15: Vol 17 Iss 3\",\"date\":\"1920-01-15\"},{\"title\":\"Coal Age 1925-07-23: Vol 28 Iss 4\",\"date\":\"1925-07-23\"},{\"title\":\"Coal Age 1926-02-18: Vol 29 Iss 7\",\"date\":\"1926-02-18\"},{\"title\":\"Coal Age 1926-04-01: Vol 29 Iss 13\",\"date\":\"1926-04-01\"},{\"title\":\"Coal Age 1927-03-10: Vol 31 Iss 10\",\"date\":\"1927-03-10\"},{\"title\":\"Coal Age 1927-03-17: Vol 31 Iss 11\",\"date\":\"1927-03-17\"},{\"title\":\"Coal Age 1928-01: Vol 33 Iss 1\",\"date\":\"1928-01-01\"},{\"title\":\"Coal Age 1928-04: Vol 33 Iss 4\",\"date\":\"1928-04-01\"},{\"title\":\"Coal Age 1933-02: Vol 38 Iss 2\",\"date\":\"1933-02-01\"},{\"title\":\"Coal Age 1937-05: Vol 42 Iss 5\",\"date\":\"1937-05-01\"},{\"title\":\"Coal Age January-December 1961: Vol 66 Index\",\"date\":\"1961-01-01\"},{\"title\":\"Coal Age January-December 1965: Vol 70 Index\",\"date\":\"1965-01-01\"},{\"title\":\"Coal Age 1911-12-09: Vol 1 Iss 9\",\"date\":\"1911-12-09\"},{\"title\":\"Coal Age 1912-01-27: Vol 1 Iss 16\",\"date\":\"1912-01-27\"},{\"title\":\"Coal Age 1913-05-31: Vol 3 Iss 22\",\"date\":\"1913-05-31\"},{\"title\":\"Coal Age 1921-05-26: Vol 19 Iss 21\",\"date\":\"1921-05-26\"},{\"title\":\"Coal Age 1921-06-02: Vol 19 Iss 22\",\"date\":\"1921-06-02\"},{\"title\":\"Coal Age 1922-02-09: Vol 21 Iss 6\",\"date\":\"1922-02-09\"},{\"title\":\"Coal Age 1923-04-26: Vol 23 Iss 17\",\"date\":\"1923-04-26\"},{\"title\":\"Coal Age 1923-12-13: Vol 24 Iss 24\",\"date\":\"1923-12-13\"},{\"title\":\"Coal Age 1923-12-20: Vol 24 Iss 25\",\"date\":\"1923-12-20\"},{\"title\":\"Coal Age 1942-05: Vol 47 Iss 5\",\"date\":\"1942-05-01\"},{\"title\":\"Coal Age 1943-10: Vol 48 Iss 10\",\"date\":\"1943-10-01\"},{\"title\":\"Coal Age 1945-11: Vol 50 Iss 11\",\"date\":\"1945-11-01\"},{\"title\":\"Coal Age 1948-08: Vol 53 Iss 8\",\"date\":\"1948-08-01\"},{\"title\":\"Coal Age 1958-05: Vol 63 Iss 5\",\"date\":\"1958-05-01\"},{\"title\":\"Coal Age 1914-06-06: Vol 5 Iss 23\",\"date\":\"1914-06-06\"},{\"title\":\"Coal Age 1914-08-15: Vol 6 Iss 7\",\"date\":\"1914-08-15\"},{\"title\":\"Coal Age 1914-10-10: Vol 6 Iss 15\",\"date\":\"1914-10-10\"},{\"title\":\"Coal Age 1915-10-23: Vol 8 Iss 17\",\"date\":\"1915-10-23\"},{\"title\":\"Coal Age 1920-01-08: Vol 17 Iss 2\",\"date\":\"1920-01-08\"},{\"title\":\"Coal Age 1920-07-22: Vol 18 Iss 4\",\"date\":\"1920-07-22\"},{\"title\":\"Coal Age 1925-04-02: Vol 27 Iss 14\",\"date\":\"1925-04-02\"},{\"title\":\"Coal Age 1925-10-29: Vol 28 Iss 18\",\"date\":\"1925-10-29\"},{\"title\":\"Coal Age 1925-11-26: Vol 28 Iss 22\",\"date\":\"1925-11-26\"},{\"title\":\"Coal Age 1930-08: Vol 35 Iss 8\",\"date\":\"1930-08-01\"},{\"title\":\"Coal Age 1932-01: Vol 37 Iss 1\",\"date\":\"1932-01-01\"},{\"title\":\"Coal Age 1932-02: Vol 37 Iss 2\",\"date\":\"1932-02-01\"},{\"title\":\"Coal Age 1933-03: Vol 38 Iss 3\",\"date\":\"1933-03-01\"},{\"title\":\"Coal Age 1917-03-31: Vol 11 Iss 13\",\"date\":\"1917-03-31\"},{\"title\":\"Coal Age 1917-07-14: Vol 12 Iss 2\",\"date\":\"1917-07-14\"},{\"title\":\"Coal Age 1918-01-19: Vol 13 Iss 3\",\"date\":\"1918-01-19\"},{\"title\":\"Coal Age 1921-11-24: Vol 20 Iss 21\",\"date\":\"1921-11-24\"},{\"title\":\"Coal Age 1922-04-20: Vol 21 Iss 16\",\"date\":\"1922-04-20\"},{\"title\":\"Coal Age 1922-06-15: Vol 21 Iss 24\",\"date\":\"1922-06-15\"},{\"title\":\"Coal Age 1922-08-10: Vol 22 Iss 6\",\"date\":\"1922-08-10\"},{\"title\":\"Coal Age 1924-10-02: Vol 26 Iss 14\",\"date\":\"1924-10-02\"},{\"title\":\"Coal Age 1925-01-22: Vol 27 Iss 4\",\"date\":\"1925-01-22\"},{\"title\":\"Coal Age 1948-05: Vol 53 Iss 5\",\"date\":\"1948-05-01\"},{\"title\":\"Coal Age 1949-12: Vol 54 Iss 12\",\"date\":\"1949-12-01\"},{\"title\":\"Coal Age 1950-11: Vol 55 Iss 11\",\"date\":\"1950-11-01\"},{\"title\":\"Coal Age 1942-09: Vol 47 Iss 9\",\"date\":\"1942-09-01\"},{\"title\":\"Coal Age 1969: Vol 74 Index\",\"date\":\"1969-01-01\"},{\"title\":\"Coal Age 1980: Vol 85 Index\",\"date\":\"1980-01-01\"},{\"title\":\"Coal Age January-December 1951: Vol 56 Index\",\"date\":\"1951-01-01\"},{\"title\":\"Coal Age 1958-09: Vol 63 Iss 9\",\"date\":\"1958-09-01\"},{\"title\":\"Coal Age 1912-11-23: Vol 2 Iss 21\",\"date\":\"1912-11-23\"},{\"title\":\"Coal Age 1913-05-03: Vol 3 Iss 18\",\"date\":\"1913-05-03\"},{\"title\":\"Coal Age 1919-02-06: Vol 15 Iss 6\",\"date\":\"1919-02-06\"},{\"title\":\"Coal Age 1923-11-29: Vol 24 Iss 22\",\"date\":\"1923-11-29\"},{\"title\":\"Coal Age 1920-10-21: Vol 18 Iss 17\",\"date\":\"1920-10-21\"},{\"title\":\"Coal Age 1920-12-09: Vol 18 Iss 24\",\"date\":\"1920-12-09\"},{\"title\":\"Coal Age 1941-04: Vol 46 Iss 4\",\"date\":\"1941-04-01\"},{\"title\":\"Coal Age 1925-07-09: Vol 28 Iss 2\",\"date\":\"1925-07-09\"},{\"title\":\"Coal Age 1927-11: Vol 32 Iss 5\",\"date\":\"1927-11-01\"},{\"title\":\"Coal Age 1929-02: Vol 34 Iss 2\",\"date\":\"1929-02-01\"},{\"title\":\"Coal Age 1930-05: Vol 35 Iss 5\",\"date\":\"1930-05-01\"},{\"title\":\"Coal Age 1916-06-10: Vol 9 Iss 24\",\"date\":\"1916-06-10\"},{\"title\":\"Coal Age 1935-06: Vol 40 Iss 6\",\"date\":\"1935-06-01\"},{\"title\":\"Coal Age 1920-04-15: Vol 17 Iss 16\",\"date\":\"1920-04-15\"},{\"title\":\"Coal Age 1960-07: Vol 65 Iss 7\",\"date\":\"1960-07-01\"},{\"title\":\"Coal Age 1913-04-19: Vol 3 Iss 16\",\"date\":\"1913-04-19\"},{\"title\":\"Coal Age 1921-01-20: Vol 19 Iss 3\",\"date\":\"1921-01-20\"},{\"title\":\"Coal Age 1922-01-26: Vol 21 Iss 4\",\"date\":\"1922-01-26\"},{\"title\":\"Coal Age 1922-05-04: Vol 21 Iss 18\",\"date\":\"1922-05-04\"},{\"title\":\"Coal Age 1947-06: Vol 52 Iss 6\",\"date\":\"1947-06-01\"},{\"title\":\"Coal Age 1949-02: Vol 54 Iss 2\",\"date\":\"1949-02-01\"},{\"title\":\"Coal Age 1949-05: Vol 54 Iss 5\",\"date\":\"1949-05-01\"},{\"title\":\"Coal Age 1960-11: Vol 65 Iss 11\",\"date\":\"1960-11-01\"},{\"title\":\"Coal Age 1961-08: Vol 66 Iss 8\",\"date\":\"1961-08-01\"},{\"title\":\"Coal Age 1982: Vol 87 Index\",\"date\":\"1982-01-01\"},{\"title\":\"Coal Age 1914: Vol 5 Index\",\"date\":\"1914-01-01\"},{\"title\":\"Coal Age 1915-11-13: Vol 8 Iss 20\",\"date\":\"1915-11-13\"},{\"title\":\"Coal Age 1916-03-18: Vol 9 Iss 12\",\"date\":\"1916-03-18\"},{\"title\":\"Coal Age 1917-11-03: Vol 12 Iss 18\",\"date\":\"1917-11-03\"},{\"title\":\"Coal Age 1919-02-27: Vol 15 Iss 9\",\"date\":\"1919-02-27\"},{\"title\":\"Coal Age 1926-09-02: Vol 30 Iss 10\",\"date\":\"1926-09-02\"},{\"title\":\"Coal Age 1926-10-21: Vol 30 Iss 17\",\"date\":\"1926-10-21\"},{\"title\":\"Coal Age 1927-06-02: Vol 31 Iss 22\",\"date\":\"1927-06-02\"},{\"title\":\"Coal Age 1934-11: Vol 39 Iss 11\",\"date\":\"1934-11-01\"},{\"title\":\"Coal Age 1940-06: Vol 45 Iss 6\",\"date\":\"1940-06-01\"},{\"title\":\"Coal Age 1954-04: Vol 59 Iss 4\",\"date\":\"1954-04-01\"},{\"title\":\"Coal Age 1958-03: Vol 63 Iss 3\",\"date\":\"1958-03-01\"},{\"title\":\"Coal Age 1959-10: Vol 64 Iss 10\",\"date\":\"1959-10-01\"},{\"title\":\"Coal Age 1914-07-18: Vol 6 Iss 3\",\"date\":\"1914-07-18\"},{\"title\":\"Coal Age 1914-09-26: Vol 6 Iss 13\",\"date\":\"1914-09-26\"},{\"title\":\"Coal Age 1916-01-01: Vol 9 Iss 1\",\"date\":\"1916-01-01\"},{\"title\":\"Coal Age 1917-02-10: Vol 11 Iss 6\",\"date\":\"1917-02-10\"},{\"title\":\"Coal Age 1914-11-14: Vol 6 Iss 20\",\"date\":\"1914-11-14\"},{\"title\":\"Coal Age 1915-03-06: Vol 7 Iss 10\",\"date\":\"1915-03-06\"},{\"title\":\"Coal Age 1919-04-17: Vol 15 Iss 16\",\"date\":\"1919-04-17\"},{\"title\":\"Coal Age 1923-01-11: Vol 23 Iss 2\",\"date\":\"1923-01-11\"},{\"title\":\"Coal Age 1924-06-05: Vol 25 Iss 23\",\"date\":\"1924-06-05\"},{\"title\":\"Coal Age 1924-09-18: Vol 26 Iss 12\",\"date\":\"1924-09-18\"},{\"title\":\"Coal Age 1925-02-12: Vol 27 Iss 7\",\"date\":\"1925-02-12\"},{\"title\":\"Coal Age 1925-03-26: Vol 27 Iss 13\",\"date\":\"1925-03-26\"},{\"title\":\"Coal Age 1934-07: Vol 39 Iss 7\",\"date\":\"1934-07-01\"},{\"title\":\"Coal Age 1936-03: Vol 41 Iss 3\",\"date\":\"1936-03-01\"},{\"title\":\"Coal Age 1938-07: Vol 43 Iss 7\",\"date\":\"1938-07-01\"},{\"title\":\"Coal Age 1956-11: Vol 61 Iss 11\",\"date\":\"1956-11-01\"},{\"title\":\"Coal Age 1960-10: Vol 65 Iss 10\",\"date\":\"1960-10-01\"},{\"title\":\"Coal Age 1912-07-13: Vol 2 Iss 2\",\"date\":\"1912-07-13\"},{\"title\":\"Coal Age 1912-07-20: Vol 2 Iss 3\",\"date\":\"1912-07-20\"},{\"title\":\"Coal Age 1917-05-19: Vol 11 Iss 20\",\"date\":\"1917-05-19\"},{\"title\":\"Coal Age 1917-09-29: Vol 12 Iss 13\",\"date\":\"1917-09-29\"},{\"title\":\"Coal Age 1917-10-20: Vol 12 Iss 16\",\"date\":\"1917-10-20\"},{\"title\":\"Coal Age 1917-12-29: Vol 12 Iss 26\",\"date\":\"1917-12-29\"},{\"title\":\"Coal Age 1918-02-23: Vol 13 Iss 8\",\"date\":\"1918-02-23\"},{\"title\":\"Coal Age 1919-07-31: Vol 16 Iss 5\",\"date\":\"1919-07-31\"},{\"title\":\"Coal Age 1919-09-18: Vol 16 Iss 12\",\"date\":\"1919-09-18\"},{\"title\":\"Coal Age 1919-10-30: Vol 16 Iss 18\",\"date\":\"1919-10-30\"},{\"title\":\"Coal Age 1920-03-25: Vol 17 Iss 13\",\"date\":\"1920-03-25\"},{\"title\":\"Coal Age 1920-07-15: Vol 18 Iss 3\",\"date\":\"1920-07-15\"},{\"title\":\"Coal Age 1920-08-12: Vol 18 Iss 7\",\"date\":\"1920-08-12\"},{\"title\":\"Coal Age 1922-07-27: Vol 22 Iss 4\",\"date\":\"1922-07-27\"},{\"title\":\"Coal Age 1921-04-21: Vol 19 Iss 16\",\"date\":\"1921-04-21\"},{\"title\":\"Coal Age 1921-09-08: Vol 20 Iss 10\",\"date\":\"1921-09-08\"},{\"title\":\"Coal Age 1921-10-13: Vol 20 Iss 15\",\"date\":\"1921-10-13\"},{\"title\":\"Coal Age 1925-11-12: Vol 28 Iss 20\",\"date\":\"1925-11-12\"},{\"title\":\"Coal Age 1949-08: Vol 54 Iss 8\",\"date\":\"1949-08-01\"},{\"title\":\"Coal Age 1950-01: Vol 55 Iss 1\",\"date\":\"1950-01-01\"},{\"title\":\"Coal Age Mid-July 1957: Vol 62\",\"date\":\"1957-07-15\"},{\"title\":\"Coal Age 1971: Vol 76 Index\",\"date\":\"1971-01-01\"},{\"title\":\"Coal Age January-December 1959: Vol 64 Index\",\"date\":\"1959-01-01\"},{\"title\":\"Coal Age 1914-11-28: Vol 6 Iss 22\",\"date\":\"1914-11-28\"},{\"title\":\"Coal Age 1920-01-22: Vol 17 Iss 4\",\"date\":\"1920-01-22\"},{\"title\":\"Coal Age 1924-03-20: Vol 25 Iss 12\",\"date\":\"1924-03-20\"},{\"title\":\"Coal Age 1914-10-17: Vol 6 Iss 16\",\"date\":\"1914-10-17\"},{\"title\":\"Coal Age 1923-02-08: Vol 23 Iss 6\",\"date\":\"1923-02-08\"},{\"title\":\"Coal Age July-December 1921: Vol 20 Index\",\"date\":\"1921-07-01\"},{\"title\":\"Coal Age 1912-09-07: Vol 2 Iss 10\",\"date\":\"1912-09-07\"},{\"title\":\"Coal Age 1912-12-28: Vol 2 Iss 26\",\"date\":\"1912-12-28\"},{\"title\":\"Coal Age 1913-10-11: Vol 4 Iss 15\",\"date\":\"1913-10-11\"},{\"title\":\"Coal Age 1913-10-18: Vol 4 Iss 16\",\"date\":\"1913-10-18\"},{\"title\":\"Coal Age 1914-05-23: Vol 5 Iss 21\",\"date\":\"1914-05-23\"},{\"title\":\"Coal Age 1914-06-20: Vol 5 Iss 25\",\"date\":\"1914-06-20\"},{\"title\":\"Coal Age 1914-08-08: Vol 6 Iss 6\",\"date\":\"1914-08-08\"},{\"title\":\"Coal Age 1914-09-05: Vol 6 Iss 10\",\"date\":\"1914-09-05\"},{\"title\":\"Coal Age 1911-12-16: Vol 1 Iss 10\",\"date\":\"1911-12-16\"},{\"title\":\"Coal Age 1913-03-01: Vol 3 Iss 9\",\"date\":\"1913-03-01\"},{\"title\":\"Coal Age 1927-04-14: Vol 31 Iss 15\",\"date\":\"1927-04-14\"},{\"title\":\"Coal Age 1927-04-21: Vol 31 Iss 16\",\"date\":\"1927-04-21\"},{\"title\":\"Coal Age 1924-01-24: Vol 25 Iss 4\",\"date\":\"1924-01-24\"},{\"title\":\"Coal Age 1928-08: Vol 33 Iss 8\",\"date\":\"1928-08-01\"},{\"title\":\"Coal Age 1935-08: Vol 40 Iss 8\",\"date\":\"1935-08-01\"},{\"title\":\"Coal Age 1936-07: Vol 41 Iss 7\",\"date\":\"1936-07-01\"},{\"title\":\"Coal Age 1940-07: Vol 45 Iss 7\",\"date\":\"1940-07-01\"},{\"title\":\"Coal Age 1956-07: Vol 61 Iss 7\",\"date\":\"1956-07-01\"},{\"title\":\"Coal Age 1958-01: Vol 63 Iss 1\",\"date\":\"1958-01-01\"},{\"title\":\"Coal Age 1916-06-24: Vol 9 Iss 26\",\"date\":\"1916-06-24\"},{\"title\":\"Coal Age 1916-07-01: Vol 10 Iss 1\",\"date\":\"1916-07-01\"},{\"title\":\"Coal Age 1921-03-03: Vol 19 Iss 9\",\"date\":\"1921-03-03\"},{\"title\":\"Coal Age 1922-04-06: Vol 21 Iss 14\",\"date\":\"1922-04-06\"},{\"title\":\"Coal Age January-December 1955: Vol 60 Index\",\"date\":\"1955-01-01\"},{\"title\":\"Coal Age 1912-01-20: Vol 1 Iss 15\",\"date\":\"1912-01-20\"},{\"title\":\"Coal Age 1916-01-29: Vol 9 Iss 5\",\"date\":\"1916-01-29\"},{\"title\":\"Coal Age 1924-12-04: Vol 26 Iss 23\",\"date\":\"1924-12-04\"},{\"title\":\"Coal Age 1926-04-08: Vol 29 Iss 14\",\"date\":\"1926-04-08\"},{\"title\":\"Coal Age 1946-01: Vol 51 Iss 1\",\"date\":\"1946-01-01\"},{\"title\":\"Coal Age 1918: Vol 14 Index\",\"date\":\"1918-01-01\"},{\"title\":\"Coal Age 1916-07-15: Vol 10 Iss 3\",\"date\":\"1916-07-15\"},{\"title\":\"Coal Age 1924-07-24: Vol 26 Iss 4\",\"date\":\"1924-07-24\"},{\"title\":\"Coal Age July 01-December 31, 1922: Vol 22 Index\",\"date\":\"1922-07-01\"},{\"title\":\"Coal Age 1943-02: Vol 48 Iss 2\",\"date\":\"1943-02-01\"},{\"title\":\"Coal Age 1916-05-13: Vol 9 Iss 20\",\"date\":\"1916-05-13\"},{\"title\":\"Coal Age 1919-05-15: Vol 15 Iss 20\",\"date\":\"1919-05-15\"},{\"title\":\"Coal Age 1920-02-19: Vol 17 Iss 8\",\"date\":\"1920-02-19\"},{\"title\":\"Coal Age 1924-04-17: Vol 25 Iss 16\",\"date\":\"1924-04-17\"},{\"title\":\"Coal Age 1931-06: Vol 36 Iss 6\",\"date\":\"1931-06-01\"},{\"title\":\"Coal Age 1913-08-16: Vol 4 Iss 7\",\"date\":\"1913-08-16\"},{\"title\":\"Coal Age 1917: Vol 11 Index\",\"date\":\"1917-01-01\"},{\"title\":\"Coal Age 1918-02-09: Vol 13 Iss 6\",\"date\":\"1918-02-09\"},{\"title\":\"Coal Age January 01-June 30, 1927: Vol 31 Index\",\"date\":\"1927-01-01\"},{\"title\":\"Coal Age July-December 1920: Vol 18 Index\",\"date\":\"1920-07-01\"},{\"title\":\"Coal Age 1919-11-06: Vol 16 Iss 19\",\"date\":\"1919-11-06\"},{\"title\":\"Coal Age 1922-04-13: Vol 21 Iss 15\",\"date\":\"1922-04-13\"},{\"title\":\"Coal Age 1920-09-30: Vol 18 Iss 14\",\"date\":\"1920-09-30\"},{\"title\":\"Coal Age 1920-12-02: Vol 18 Iss 23\",\"date\":\"1920-12-02\"},{\"title\":\"Coal Age 1921-08-18: Vol 20 Iss 7\",\"date\":\"1921-08-18\"},{\"title\":\"Coal Age 1925-06-25: Vol 27 Iss 26\",\"date\":\"1925-06-25\"},{\"title\":\"Coal Age 1926-10-28: Vol 30 Iss 18\",\"date\":\"1926-10-28\"},{\"title\":\"Coal Age 1927-02-17: Vol 31 Iss 7\",\"date\":\"1927-02-17\"},{\"title\":\"Coal Age 1929-01: Vol 34 Iss 1\",\"date\":\"1929-01-01\"},{\"title\":\"Coal Age 1932-07: Vol 37 Iss 7\",\"date\":\"1932-07-01\"},{\"title\":\"Coal Age 1937-04: Vol 42 Iss 4\",\"date\":\"1937-04-01\"},{\"title\":\"Coal Age 1938-03: Vol 43 Iss 3\",\"date\":\"1938-03-01\"},{\"title\":\"Coal Age 1938-12: Vol 43 Iss 12\",\"date\":\"1938-12-01\"},{\"title\":\"Coal Age 1947-04: Vol 52 Iss 4\",\"date\":\"1947-04-01\"},{\"title\":\"Coal Age 1948-11: Vol 53 Iss 11\",\"date\":\"1948-11-01\"},{\"title\":\"Coal Age 1950-09: Vol 55 Iss 9\",\"date\":\"1950-09-01\"},{\"title\":\"Coal Age 1944-01: Vol 49 Iss 1\",\"date\":\"1944-01-01\"},{\"title\":\"Coal Age 1912-06-15: Vol 1 Iss 36\",\"date\":\"1912-06-15\"},{\"title\":\"Coal Age 1912-10-26: Vol 2 Iss 17\",\"date\":\"1912-10-26\"},{\"title\":\"Coal Age 1912-11-09: Vol 2 Iss 19\",\"date\":\"1912-11-09\"},{\"title\":\"Coal Age 1912-12-21: Vol 2 Iss 25\",\"date\":\"1912-12-21\"},{\"title\":\"Coal Age 1916-03-04: Vol 9 Iss 10\",\"date\":\"1916-03-04\"},{\"title\":\"Coal Age 1916-10-14: Vol 10 Iss 16\",\"date\":\"1916-10-14\"},{\"title\":\"Coal Age 1916-11-25: Vol 10 Iss 22\",\"date\":\"1916-11-25\"},{\"title\":\"Coal Age 1916-12-16: Vol 10 Iss 25\",\"date\":\"1916-12-16\"},{\"title\":\"Coal Age 1915-07-31: Vol 8 Iss 5\",\"date\":\"1915-07-31\"},{\"title\":\"Coal Age 1917-05-12: Vol 11 Iss 19\",\"date\":\"1917-05-12\"},{\"title\":\"Coal Age 1917-12-15: Vol 12 Iss 24\",\"date\":\"1917-12-15\"},{\"title\":\"Coal Age 1914-07-04: Vol 6 Iss 1\",\"date\":\"1914-07-04\"},{\"title\":\"Coal Age 1915-04-10: Vol 7 Iss 15\",\"date\":\"1915-04-10\"},{\"title\":\"Coal Age 1917-06-02: Vol 11 Iss 22\",\"date\":\"1917-06-02\"},{\"title\":\"Coal Age 1921-07-14: Vol 20 Iss 2\",\"date\":\"1921-07-14\"},{\"title\":\"Coal Age 1922-02-02: Vol 21 Iss 5\",\"date\":\"1922-02-02\"},{\"title\":\"Coal Age 1948-10: Vol 53 Iss 10\",\"date\":\"1948-10-01\"},{\"title\":\"Coal Age 1919-06-26: Vol 15 Iss 26\",\"date\":\"1919-06-26\"},{\"title\":\"Coal Age 1919-07-03: Vol 16 Iss 1\",\"date\":\"1919-07-03\"},{\"title\":\"Coal Age 1912-06-22: Vol 1 Iss 37\",\"date\":\"1912-06-22\"},{\"title\":\"Coal Age 1912-09-28: Vol 2 Iss 13\",\"date\":\"1912-09-28\"},{\"title\":\"Coal Age 1916-04-15: Vol 9 Iss 16\",\"date\":\"1916-04-15\"},{\"title\":\"Coal Age 1916-08-19: Vol 10 Iss 8\",\"date\":\"1916-08-19\"},{\"title\":\"Coal Age 1920-12-30: Vol 18 Iss 27\",\"date\":\"1920-12-30\"},{\"title\":\"Coal Age 1922-02-16: Vol 21 Iss 7\",\"date\":\"1922-02-16\"},{\"title\":\"Coal Age 1918-12-12: Vol 14 Iss 24\",\"date\":\"1918-12-12\"},{\"title\":\"Coal Age 1919-04-10: Vol 15 Iss 15\",\"date\":\"1919-04-10\"},{\"title\":\"Coal Age 1919-09-04: Vol 16 Iss 10\",\"date\":\"1919-09-04\"},{\"title\":\"Coal Age 1926-12-23: Vol 30 Iss 26\",\"date\":\"1926-12-23\"},{\"title\":\"Coal Age 1923-01-25: Vol 23 Iss 4\",\"date\":\"1923-01-25\"},{\"title\":\"Coal Age 1923-03-22: Vol 23 Iss 12\",\"date\":\"1923-03-22\"},{\"title\":\"Coal Age 1924-08-14: Vol 26 Iss 7\",\"date\":\"1924-08-14\"},{\"title\":\"Coal Age 1943-03: Vol 48 Iss 3\",\"date\":\"1943-03-01\"},{\"title\":\"Coal Age 1944-10: Vol 49 Iss 10\",\"date\":\"1944-10-01\"},{\"title\":\"Coal Age 1946-02: Vol 51 Iss 2\",\"date\":\"1946-02-01\"},{\"title\":\"Coal Age 1946: Vol 51 Index\",\"date\":\"1946-01-01\"},{\"title\":\"Coal Age 1950-03: Vol 55 Iss 3\",\"date\":\"1950-03-01\"},{\"title\":\"Coal Age 1951-09: Vol 56 Iss 9\",\"date\":\"1951-09-01\"},{\"title\":\"Coal Age Mid-September 1955: Vol 60\",\"date\":\"1955-09-15\"},{\"title\":\"Coal Age 1914-04-11: Vol 5 Iss 15\",\"date\":\"1914-04-11\"},{\"title\":\"Coal Age 1912-07-27: Vol 2 Iss 4\",\"date\":\"1912-07-27\"},{\"title\":\"Coal Age 1912-10-05: Vol 2 Iss 14\",\"date\":\"1912-10-05\"},{\"title\":\"Coal Age 1913-09-06: Vol 4 Iss 10\",\"date\":\"1913-09-06\"},{\"title\":\"Coal Age 1913-11-08: Vol 4 Iss 19\",\"date\":\"1913-11-08\"},{\"title\":\"Coal Age 1914-05-02: Vol 5 Iss 18\",\"date\":\"1914-05-02\"},{\"title\":\"Coal Age 1915: Vol 8 Index\",\"date\":\"1915-01-01\"},{\"title\":\"Coal Age 1918-11-28: Vol 14 Iss 22\",\"date\":\"1918-11-28\"},{\"title\":\"Coal Age 1925-01-29: Vol 27 Iss 5\",\"date\":\"1925-01-29\"},{\"title\":\"Coal Age 1927-06-23: Vol 31 Iss 25\",\"date\":\"1927-06-23\"},{\"title\":\"Coal Age 1940-11: Vol 45 Iss 11\",\"date\":\"1940-11-01\"},{\"title\":\"Coal Age 1941-03: Vol 46 Iss 3\",\"date\":\"1941-03-01\"},{\"title\":\"Coal Age 1941-05: Vol 46 Iss 5\",\"date\":\"1941-05-01\"},{\"title\":\"Coal Age 1942-07: Vol 47 Iss 7\",\"date\":\"1942-07-01\"},{\"title\":\"Coal Age 1943-12: Vol 48 Iss 12\",\"date\":\"1943-12-01\"},{\"title\":\"Coal Age 1944-06: Vol 49 Iss 6\",\"date\":\"1944-06-01\"},{\"title\":\"Coal Age 1958-04: Vol 63 Iss 4\",\"date\":\"1958-04-01\"},{\"title\":\"Coal Age 1960-06: Vol 65 Iss 6\",\"date\":\"1960-06-01\"},{\"title\":\"Coal Age 1920-05-06: Vol 17 Iss 19\",\"date\":\"1920-05-06\"},{\"title\":\"Coal Age 1927-02-24: Vol 31 Iss 8\",\"date\":\"1927-02-24\"},{\"title\":\"Coal Age 1932-11: Vol 37 Iss 11\",\"date\":\"1932-11-01\"},{\"title\":\"Coal Age 1933-05: Vol 38 Iss 5\",\"date\":\"1933-05-01\"},{\"title\":\"Coal Age 1935-10: Vol 40 Iss 10\",\"date\":\"1935-10-01\"},{\"title\":\"Coal Age 1949-07: Vol 54 Iss 7\",\"date\":\"1949-07-01\"},{\"title\":\"Coal Age 1949-11: Vol 54 Iss 11\",\"date\":\"1949-11-01\"},{\"title\":\"Coal Age 1950-08: Vol 55 Iss 8\",\"date\":\"1950-08-01\"},{\"title\":\"Coal Age 1950-12: Vol 55 Iss 12\",\"date\":\"1950-12-01\"},{\"title\":\"Coal Age 1984: Vol 89 Index\",\"date\":\"1984-01-01\"},{\"title\":\"Coal Age January-December 1938: Vol 43 Index\",\"date\":\"1938-01-01\"},{\"title\":\"Coal Age 1914-03-28: Vol 5 Iss 13\",\"date\":\"1914-03-28\"},{\"title\":\"Coal Age 1936-08: Vol 41 Iss 8\",\"date\":\"1936-08-01\"},{\"title\":\"Coal Age 1925-08-06: Vol 28 Iss 6\",\"date\":\"1925-08-06\"},{\"title\":\"Coal Age 1912-03-16: Vol 1 Iss 23\",\"date\":\"1912-03-16\"},{\"title\":\"Coal Age 1917-11-17: Vol 12 Iss 20\",\"date\":\"1917-11-17\"},{\"title\":\"Coal Age 1918-02-02: Vol 13 Iss 5\",\"date\":\"1918-02-02\"},{\"title\":\"Coal Age 1948: Vol 53 Index\",\"date\":\"1948-01-01\"},{\"title\":\"Coal Age 1941-02: Vol 46 Iss 2\",\"date\":\"1941-02-01\"},{\"title\":\"Coal Age 1920-07-08: Vol 18 Iss 2\",\"date\":\"1920-07-08\"},{\"title\":\"Coal Age 1922-02-23: Vol 21 Iss 8\",\"date\":\"1922-02-23\"},{\"title\":\"Coal Age 1918-10-17: Vol 14 Iss 16\",\"date\":\"1918-10-17\"},{\"title\":\"Coal Age 1918-12-26: Vol 14 Iss 26\",\"date\":\"1918-12-26\"},{\"title\":\"Coal Age 1926-08-12: Vol 30 Iss 7\",\"date\":\"1926-08-12\"},{\"title\":\"Coal Age 1926-11-04: Vol 30 Iss 19\",\"date\":\"1926-11-04\"},{\"title\":\"Coal Age 1947-02: Vol 52 Iss 2\",\"date\":\"1947-02-01\"},{\"title\":\"Coal Age 1947-10: Vol 52 Iss 10\",\"date\":\"1947-10-01\"},{\"title\":\"Coal Age 1959-11: Vol 64 Iss 11\",\"date\":\"1959-11-01\"},{\"title\":\"Coal Age 1961-10: Vol 66 Iss 10\",\"date\":\"1961-10-01\"},{\"title\":\"Coal Age 1916-06-03: Vol 9 Iss 23\",\"date\":\"1916-06-03\"},{\"title\":\"Coal Age 1928-09: Vol 33 Iss 9\",\"date\":\"1928-09-01\"},{\"title\":\"Coal Age 1934-02: Vol 39 Iss 2\",\"date\":\"1934-02-01\"},{\"title\":\"Coal Age 1936-05: Vol 41 Iss 5\",\"date\":\"1936-05-01\"},{\"title\":\"Coal Age 1938-02: Vol 43 Iss 2\",\"date\":\"1938-02-01\"},{\"title\":\"Coal Age 1939-06: Vol 44 Iss 6\",\"date\":\"1939-06-01\"},{\"title\":\"Coal Age 1940-05: Vol 45 Iss 5\",\"date\":\"1940-05-01\"},{\"title\":\"Coal Age 1955-04: Vol 60 Iss 4\",\"date\":\"1955-04-01\"},{\"title\":\"Coal Age 1913-12-27: Vol 4 Iss 26\",\"date\":\"1913-12-27\"},{\"title\":\"Coal Age 1921-06-09: Vol 19 Iss 23\",\"date\":\"1921-06-09\"},{\"title\":\"Coal Age 1953-12: Vol 58 Iss 12\",\"date\":\"1953-12-01\"},{\"title\":\"Coal Age 1913-07-05: Vol 4 Iss 1\",\"date\":\"1913-07-05\"},{\"title\":\"Coal Age 1916: Vol 10 Index\",\"date\":\"1916-01-01\"},{\"title\":\"Coal Age 1917-11-24: Vol 12 Iss 21\",\"date\":\"1917-11-24\"},{\"title\":\"Coal Age 1918-03-23: Vol 13 Iss 12\",\"date\":\"1918-03-23\"},{\"title\":\"Coal Age 1918-04-27: Vol 13 Iss 17\",\"date\":\"1918-04-27\"},{\"title\":\"Coal Age 1918-11-07: Vol 14 Iss 19\",\"date\":\"1918-11-07\"},{\"title\":\"Coal Age 1923-05-31: Vol 23 Iss 22\",\"date\":\"1923-05-31\"},{\"title\":\"Coal Age 1944-11: Vol 49 Iss 11\",\"date\":\"1944-11-01\"},{\"title\":\"Coal Age January-December 1934: Vol 39 Index\",\"date\":\"1934-01-01\"},{\"title\":\"Coal Age 1912-03-30: Vol 1 Iss 25\",\"date\":\"1912-03-30\"},{\"title\":\"Coal Age 1912-04-06: Vol 1 Iss 26\",\"date\":\"1912-04-06\"},{\"title\":\"Coal Age 1916-09-02: Vol 10 Iss 10\",\"date\":\"1916-09-02\"},{\"title\":\"Coal Age 1914-10-24: Vol 6 Iss 17\",\"date\":\"1914-10-24\"},{\"title\":\"Coal Age 1915-05-01: Vol 7 Iss 18\",\"date\":\"1915-05-01\"},{\"title\":\"Coal Age 1915-08-07: Vol 8 Iss 6\",\"date\":\"1915-08-07\"},{\"title\":\"Coal Age 1915-08-28: Vol 8 Iss 9\",\"date\":\"1915-08-28\"},{\"title\":\"Coal Age 1918-06-22: Vol 13 Iss 25\",\"date\":\"1918-06-22\"},{\"title\":\"Coal Age 1923-02-01: Vol 23 Iss 5\",\"date\":\"1923-02-01\"},{\"title\":\"Coal Age 1923-10-25: Vol 24 Iss 17\",\"date\":\"1923-10-25\"},{\"title\":\"Coal Age 1921-09-01: Vol 20 Iss 9\",\"date\":\"1921-09-01\"},{\"title\":\"Coal Age 1921-10-06: Vol 20 Iss 14\",\"date\":\"1921-10-06\"},{\"title\":\"Coal Age 1932-10: Vol 37 Iss 10\",\"date\":\"1932-10-01\"},{\"title\":\"Coal Age 1941: Vol 46 Index\",\"date\":\"1941-01-01\"},{\"title\":\"Coal Age January-December 1931: Vol 36 Index\",\"date\":\"1931-01-01\"},{\"title\":\"Coal Age 1957-07: Vol 62 Iss 7\",\"date\":\"1957-07-01\"},{\"title\":\"Coal Age 1958-11: Vol 63 Iss 11\",\"date\":\"1958-11-01\"},{\"title\":\"Coal Age 1913-11-29: Vol 4 Iss 22\",\"date\":\"1913-11-29\"},{\"title\":\"Coal Age 1914-01-31: Vol 5 Iss 5\",\"date\":\"1914-01-31\"},{\"title\":\"Coal Age 1914-03-14: Vol 5 Iss 11\",\"date\":\"1914-03-14\"},{\"title\":\"Coal Age 1916-04-29: Vol 9 Iss 18\",\"date\":\"1916-04-29\"},{\"title\":\"Coal Age 1916-07-22: Vol 10 Iss 4\",\"date\":\"1916-07-22\"},{\"title\":\"Coal Age 1919-09-25: Vol 16 Iss 13\",\"date\":\"1919-09-25\"},{\"title\":\"Coal Age 1922-11-02: Vol 22 Iss 18\",\"date\":\"1922-11-02\"},{\"title\":\"Coal Age 1925-04-16: Vol 27 Iss 16\",\"date\":\"1925-04-16\"},{\"title\":\"Coal Age 1926-03-18: Vol 29 Iss 11\",\"date\":\"1926-03-18\"},{\"title\":\"Coal Age 1927-05-12: Vol 31 Iss 19\",\"date\":\"1927-05-12\"},{\"title\":\"Coal Age 1927-08: Vol 32 Iss 2\",\"date\":\"1927-08-01\"},{\"title\":\"Coal Age 1928-07: Vol 33 Iss 7\",\"date\":\"1928-07-01\"},{\"title\":\"Coal Age 1929-04: Vol 34 Iss 4\",\"date\":\"1929-04-01\"},{\"title\":\"Coal Age 1930-09: Vol 35 Iss 9\",\"date\":\"1930-09-01\"},{\"title\":\"Coal Age 1948-01: Vol 53 Iss 1\",\"date\":\"1948-01-01\"},{\"title\":\"Coal Age 1950-07: Vol 55 Iss 7\",\"date\":\"1950-07-01\"},{\"title\":\"Coal Age 1943-04: Vol 48 Iss 4\",\"date\":\"1943-04-01\"},{\"title\":\"Coal Age 1946-04: Vol 51 Iss 4\",\"date\":\"1946-04-01\"},{\"title\":\"Coal Age 1946-08: Vol 51 Iss 8\",\"date\":\"1946-08-01\"},{\"title\":\"Coal Age 1915-09-18: Vol 8 Iss 12\",\"date\":\"1915-09-18\"},{\"title\":\"Coal Age 1916-01-15: Vol 9 Iss 3\",\"date\":\"1916-01-15\"},{\"title\":\"Coal Age 1917-02-24: Vol 11 Iss 8\",\"date\":\"1917-02-24\"},{\"title\":\"Coal Age 1917-03-24: Vol 11 Iss 12\",\"date\":\"1917-03-24\"},{\"title\":\"Coal Age 1918-06-29: Vol 13 Iss 26\",\"date\":\"1918-06-29\"},{\"title\":\"Coal Age 1925-12-10: Vol 28 Iss 24\",\"date\":\"1925-12-10\"},{\"title\":\"Coal Age 1926-07-29: Vol 30 Iss 5\",\"date\":\"1926-07-29\"},{\"title\":\"Coal Age 1941-11: Vol 46 Iss 11\",\"date\":\"1941-11-01\"},{\"title\":\"Coal Age 1953-05: Vol 58 Iss 5\",\"date\":\"1953-05-01\"},{\"title\":\"Coal Age 1954-09: Vol 59 Iss 9\",\"date\":\"1954-09-01\"},{\"title\":\"Coal Age 1955-08: Vol 60 Iss 8\",\"date\":\"1955-08-01\"},{\"title\":\"Coal Age 1958-12: Vol 63 Iss 12\",\"date\":\"1958-12-01\"},{\"title\":\"Coal Age 1912-04-27: Vol 1 Iss 29\",\"date\":\"1912-04-27\"},{\"title\":\"Coal Age 1921-10-20: Vol 20 Iss 16\",\"date\":\"1921-10-20\"},{\"title\":\"Coal Age 1921-10-27: Vol 20 Iss 17\",\"date\":\"1921-10-27\"},{\"title\":\"Coal Age 1921-12-01: Vol 20 Iss 22\",\"date\":\"1921-12-01\"},{\"title\":\"Coal Age 1922-07-13: Vol 22 Iss 2\",\"date\":\"1922-07-13\"},{\"title\":\"Coal Age 1923-09-06: Vol 24 Iss 10\",\"date\":\"1923-09-06\"},{\"title\":\"Coal Age 1923-11-01: Vol 24 Iss 18\",\"date\":\"1923-11-01\"},{\"title\":\"Coal Age 1924-04-24: Vol 25 Iss 17\",\"date\":\"1924-04-24\"},{\"title\":\"Coal Age 1946-05: Vol 51 Iss 5\",\"date\":\"1946-05-01\"},{\"title\":\"Coal Age 1961-06: Vol 66 Iss 6\",\"date\":\"1961-06-01\"},{\"title\":\"Coal Age 1915-12-18: Vol 8 Iss 25\",\"date\":\"1915-12-18\"},{\"title\":\"Coal Age 1924-09-04: Vol 26 Iss 10\",\"date\":\"1924-09-04\"},{\"title\":\"Coal Age 1913-01-25: Vol 3 Iss 4\",\"date\":\"1913-01-25\"},{\"title\":\"Coal Age 1913-03-22: Vol 3 Iss 12\",\"date\":\"1913-03-22\"},{\"title\":\"Coal Age 1915-08-14: Vol 8 Iss 7\",\"date\":\"1915-08-14\"},{\"title\":\"Coal Age 1918-07-06: Vol 14 Iss 1\",\"date\":\"1918-07-06\"},{\"title\":\"Coal Age 1914-02-21: Vol 5 Iss 8\",\"date\":\"1914-02-21\"},{\"title\":\"Coal Age 1919-03-27: Vol 15 Iss 13\",\"date\":\"1919-03-27\"},{\"title\":\"Coal Age 1920-10-07: Vol 18 Iss 15\",\"date\":\"1920-10-07\"},{\"title\":\"Coal Age 1928-02: Vol 33 Iss 2\",\"date\":\"1928-02-01\"},{\"title\":\"Coal Age 1981: Vol 86 Index\",\"date\":\"1981-01-01\"},{\"title\":\"Coal Age 1932-06: Vol 37 Iss 6\",\"date\":\"1932-06-01\"},{\"title\":\"Coal Age 1956-09: Vol 61 Iss 9\",\"date\":\"1956-09-01\"},{\"title\":\"Coal Age 1957-05: Vol 62 Iss 5\",\"date\":\"1957-05-01\"},{\"title\":\"Coal Age 1914-05-09: Vol 5 Iss 19\",\"date\":\"1914-05-09\"},{\"title\":\"Coal Age 1915-12-11: Vol 8 Iss 24\",\"date\":\"1915-12-11\"},{\"title\":\"Coal Age 1923-04-05: Vol 23 Iss 14\",\"date\":\"1923-04-05\"},{\"title\":\"Coal Age 1923-04-19: Vol 23 Iss 16\",\"date\":\"1923-04-19\"},{\"title\":\"Coal Age 1923-08-02: Vol 24 Iss 5\",\"date\":\"1923-08-02\"},{\"title\":\"Coal Age 1925-06-04: Vol 27 Iss 23\",\"date\":\"1925-06-04\"},{\"title\":\"Coal Age 1947-01: Vol 52 Iss 1\",\"date\":\"1947-01-01\"},{\"title\":\"Coal Age 1952-04: Vol 57 Iss 4\",\"date\":\"1952-04-01\"},{\"title\":\"Coal Age 1913-05-24: Vol 3 Iss 21\",\"date\":\"1913-05-24\"},{\"title\":\"Coal Age 1921-02-03: Vol 19 Iss 5\",\"date\":\"1921-02-03\"},{\"title\":\"Coal Age 1921-12-29: Vol 20 Iss 26\",\"date\":\"1921-12-29\"},{\"title\":\"Coal Age 1917-07-07: Vol 12 Iss 1\",\"date\":\"1917-07-07\"},{\"title\":\"Coal Age 1917-10-06: Vol 12 Iss 14\",\"date\":\"1917-10-06\"},{\"title\":\"Coal Age 1918-12-19: Vol 14 Iss 25\",\"date\":\"1918-12-19\"},{\"title\":\"Coal Age 1920-02-12: Vol 17 Iss 7\",\"date\":\"1920-02-12\"},{\"title\":\"Coal Age 1925-10-15: Vol 28 Iss 16\",\"date\":\"1925-10-15\"},{\"title\":\"Coal Age 1927-03-03: Vol 31 Iss 9\",\"date\":\"1927-03-03\"},{\"title\":\"Coal Age 1930-11: Vol 35 Iss 11\",\"date\":\"1930-11-01\"},{\"title\":\"Coal Age 1933-08: Vol 38 Iss 8\",\"date\":\"1933-08-01\"},{\"title\":\"Coal Age 1939-05: Vol 44 Iss 5\",\"date\":\"1939-05-01\"},{\"title\":\"Coal Age 1940: Vol 45 Index\",\"date\":\"1940-01-01\"},{\"title\":\"Coal Age 1943-06: Vol 48 Iss 6\",\"date\":\"1943-06-01\"},{\"title\":\"Coal Age 1920-11-25: Vol 18 Iss 22\",\"date\":\"1920-11-25\"},{\"title\":\"Coal Age 1917-08-11: Vol 12 Iss 6\",\"date\":\"1917-08-11\"},{\"title\":\"Coal Age 1918-08-15: Vol 14 Iss 7\",\"date\":\"1918-08-15\"},{\"title\":\"Coal Age 1923-07-12: Vol 24 Iss 2\",\"date\":\"1923-07-12\"},{\"title\":\"Coal Age 1924-02-07: Vol 25 Iss 6\",\"date\":\"1924-02-07\"},{\"title\":\"Coal Age 1924-05-29: Vol 25 Iss 22\",\"date\":\"1924-05-29\"},{\"title\":\"Coal Age 1955-09: Vol 60 Iss 9\",\"date\":\"1955-09-01\"},{\"title\":\"Coal Age 1955-11: Vol 60 Iss 11\",\"date\":\"1955-11-01\"},{\"title\":\"Coal Age 1915-02-13: Vol 7 Iss 7\",\"date\":\"1915-02-13\"},{\"title\":\"Coal Age 1916-05-27: Vol 9 Iss 22\",\"date\":\"1916-05-27\"},{\"title\":\"Coal Age 1916-12-09: Vol 10 Iss 24\",\"date\":\"1916-12-09\"},{\"title\":\"Coal Age 1925-09-10: Vol 28 Iss 11\",\"date\":\"1925-09-10\"},{\"title\":\"Coal Age 1926-05-20: Vol 29 Iss 20\",\"date\":\"1926-05-20\"},{\"title\":\"Coal Age 1945-07: Vol 50 Iss 7\",\"date\":\"1945-07-01\"},{\"title\":\"Coal Age 1946-06: Vol 51 Iss 6\",\"date\":\"1946-06-01\"},{\"title\":\"Coal Age January-December 1960: Vol 65 Index\",\"date\":\"1960-01-01\"},{\"title\":\"Coal Age 1917-06-23: Vol 11 Iss 25\",\"date\":\"1917-06-23\"},{\"title\":\"Coal Age 1921-02-24: Vol 19 Iss 8\",\"date\":\"1921-02-24\"},{\"title\":\"Coal Age 1953-01: Vol 58 Iss 1\",\"date\":\"1953-01-01\"},{\"title\":\"Coal Age 1914-01-03: Vol 5 Iss 1\",\"date\":\"1914-01-03\"},{\"title\":\"Coal Age 1914-02-28: Vol 5 Iss 9\",\"date\":\"1914-02-28\"},{\"title\":\"Coal Age 1914-09-19: Vol 6 Iss 12\",\"date\":\"1914-09-19\"},{\"title\":\"Coal Age 1918-06-08: Vol 13 Iss 23\",\"date\":\"1918-06-08\"},{\"title\":\"Coal Age 1918-11-14: Vol 14 Iss 20\",\"date\":\"1918-11-14\"},{\"title\":\"Coal Age 1920-10-28: Vol 18 Iss 18\",\"date\":\"1920-10-28\"},{\"title\":\"Coal Age 1921-01-27: Vol 19 Iss 4\",\"date\":\"1921-01-27\"},{\"title\":\"Coal Age 1921-06-23: Vol 19 Iss 25\",\"date\":\"1921-06-23\"},{\"title\":\"Coal Age 1924-05-15: Vol 25 Iss 20\",\"date\":\"1924-05-15\"},{\"title\":\"Coal Age 1924-08-21: Vol 26 Iss 8\",\"date\":\"1924-08-21\"},{\"title\":\"Coal Age 1924-09-11: Vol 26 Iss 11\",\"date\":\"1924-09-11\"},{\"title\":\"Coal Age 1926-11-18: Vol 30 Iss 21\",\"date\":\"1926-11-18\"},{\"title\":\"Coal Age 1927-02-10: Vol 31 Iss 6\",\"date\":\"1927-02-10\"},{\"title\":\"Coal Age 1937-02: Vol 42 Iss 2\",\"date\":\"1937-02-01\"},{\"title\":\"Coal Age 1951-10: Vol 56 Iss 10\",\"date\":\"1951-10-01\"},{\"title\":\"Coal Age January 01-June 30, 1924: Vol 25 Index\",\"date\":\"1924-01-01\"},{\"title\":\"Coal Age 1913-01-18: Vol 3 Iss 3\",\"date\":\"1913-01-18\"},{\"title\":\"Coal Age 1911-11-04: Vol 1 Iss 4\",\"date\":\"1911-11-04\"},{\"title\":\"Coal Age 1911-11-25: Vol 1 Iss 7\",\"date\":\"1911-11-25\"},{\"title\":\"Coal Age 1912-02-17: Vol 1 Iss 19\",\"date\":\"1912-02-17\"},{\"title\":\"Coal Age 1912-03-02: Vol 1 Iss 21\",\"date\":\"1912-03-02\"},{\"title\":\"Coal Age 1915-02-20: Vol 7 Iss 8\",\"date\":\"1915-02-20\"},{\"title\":\"Coal Age 1917-06-16: Vol 11 Iss 24\",\"date\":\"1917-06-16\"},{\"title\":\"Coal Age 1917-06-30: Vol 11 Iss 26\",\"date\":\"1917-06-30\"},{\"title\":\"Coal Age 1917-08-04: Vol 12 Iss 5\",\"date\":\"1917-08-04\"},{\"title\":\"Coal Age 1918-03-16: Vol 13 Iss 11\",\"date\":\"1918-03-16\"},{\"title\":\"Coal Age 1920-08-05: Vol 18 Iss 6\",\"date\":\"1920-08-05\"},{\"title\":\"Coal Age 1922-03-30: Vol 21 Iss 13\",\"date\":\"1922-03-30\"},{\"title\":\"Coal Age 1922-09-14: Vol 22 Iss 11\",\"date\":\"1922-09-14\"},{\"title\":\"Coal Age 1923-03-08: Vol 23 Iss 10\",\"date\":\"1923-03-08\"},{\"title\":\"Coal Age 1923-05-17: Vol 23 Iss 20\",\"date\":\"1923-05-17\"},{\"title\":\"Coal Age 1923-07-19: Vol 24 Iss 3\",\"date\":\"1923-07-19\"},{\"title\":\"Coal Age 1925-08-20: Vol 28 Iss 8\",\"date\":\"1925-08-20\"},{\"title\":\"Coal Age 1925-09-17: Vol 28 Iss 12\",\"date\":\"1925-09-17\"},{\"title\":\"Coal Age 1928-06: Vol 33 Iss 6\",\"date\":\"1928-06-01\"},{\"title\":\"Coal Age 1939-08: Vol 44 Iss 8\",\"date\":\"1939-08-01\"},{\"title\":\"Coal Age 1940-10: Vol 45 Iss 10\",\"date\":\"1940-10-01\"},{\"title\":\"Coal Age 1941-10: Vol 46 Iss 10\",\"date\":\"1941-10-01\"},{\"title\":\"Coal Age 1950-10: Vol 55 Iss 10\",\"date\":\"1950-10-01\"},{\"title\":\"Coal Age 1942-06: Vol 47 Iss 6\",\"date\":\"1942-06-01\"},{\"title\":\"Coal Age 1944-05: Vol 49 Iss 5\",\"date\":\"1944-05-01\"},{\"title\":\"Coal Age 1946-07: Vol 51 Iss 7\",\"date\":\"1946-07-01\"},{\"title\":\"Coal Age 1958-07: Vol 63 Iss 7\",\"date\":\"1958-07-01\"},{\"title\":\"Coal Age 1912-08-10: Vol 2 Iss 6\",\"date\":\"1912-08-10\"},{\"title\":\"Coal Age 1912-12-14: Vol 2 Iss 24\",\"date\":\"1912-12-14\"},{\"title\":\"Coal Age 1913-04-12: Vol 3 Iss 15\",\"date\":\"1913-04-12\"},{\"title\":\"Coal Age 1913-08-09: Vol 4 Iss 6\",\"date\":\"1913-08-09\"},{\"title\":\"Coal Age 1916-11-11: Vol 10 Iss 20\",\"date\":\"1916-11-11\"},{\"title\":\"Coal Age 1916: Vol 9 Index\",\"date\":\"1916-01-01\"},{\"title\":\"Coal Age 1914-12-05: Vol 6 Iss 23\",\"date\":\"1914-12-05\"},{\"title\":\"Coal Age 1915-01-02: Vol 7 Iss 1\",\"date\":\"1915-01-02\"},{\"title\":\"Coal Age 1915-02-27: Vol 7 Iss 9\",\"date\":\"1915-02-27\"},{\"title\":\"Coal Age 1917-12-22: Vol 12 Iss 25\",\"date\":\"1917-12-22\"},{\"title\":\"Coal Age 1918-03-30: Vol 13 Iss 13\",\"date\":\"1918-03-30\"},{\"title\":\"Coal Age 1925-04-09: Vol 27 Iss 15\",\"date\":\"1925-04-09\"},{\"title\":\"Coal Age 1925-12-17: Vol 28 Iss 25\",\"date\":\"1925-12-17\"},{\"title\":\"Coal Age 1926-02-11: Vol 29 Iss 6\",\"date\":\"1926-02-11\"},{\"title\":\"Coal Age 1926-03-04: Vol 29 Iss 9\",\"date\":\"1926-03-04\"},{\"title\":\"Coal Age 1924-08-28: Vol 26 Iss 9\",\"date\":\"1924-08-28\"},{\"title\":\"Coal Age 1924-10-16: Vol 26 Iss 16\",\"date\":\"1924-10-16\"},{\"title\":\"Coal Age 1914-01-24: Vol 5 Iss 4\",\"date\":\"1914-01-24\"},{\"title\":\"Coal Age 1914-08-29: Vol 6 Iss 9\",\"date\":\"1914-08-29\"},{\"title\":\"Coal Age 1919-01-16: Vol 15 Iss 3\",\"date\":\"1919-01-16\"},{\"title\":\"Coal Age 1919-06-12: Vol 15 Iss 24\",\"date\":\"1919-06-12\"},{\"title\":\"Coal Age 1923-12-06: Vol 24 Iss 23\",\"date\":\"1923-12-06\"},{\"title\":\"Coal Age 1924-01-10: Vol 25 Iss 2\",\"date\":\"1924-01-10\"},{\"title\":\"Coal Age 1913-08-23: Vol 4 Iss 8\",\"date\":\"1913-08-23\"},{\"title\":\"Coal Age 1914-01-17: Vol 5 Iss 3\",\"date\":\"1914-01-17\"},{\"title\":\"Coal Age 1920-03-11: Vol 17 Iss 11\",\"date\":\"1920-03-11\"},{\"title\":\"Coal Age 1922-06-29: Vol 21 Iss 26\",\"date\":\"1922-06-29\"},{\"title\":\"Coal Age 1922-09-28: Vol 22 Iss 13\",\"date\":\"1922-09-28\"},{\"title\":\"Coal Age 1923-05-24: Vol 23 Iss 21\",\"date\":\"1923-05-24\"},{\"title\":\"Coal Age 1926-06-10: Vol 29 Iss 23\",\"date\":\"1926-06-10\"},{\"title\":\"Coal Age 1935-02: Vol 40 Iss 2\",\"date\":\"1935-02-01\"},{\"title\":\"Coal Age 1936-09: Vol 41 Iss 9\",\"date\":\"1936-09-01\"},{\"title\":\"Coal Age 1936-12: Vol 41 Iss 12\",\"date\":\"1936-12-01\"},{\"title\":\"Coal Age 1912-12-07: Vol 2 Iss 23\",\"date\":\"1912-12-07\"},{\"title\":\"Coal Age 1913-03-08: Vol 3 Iss 10\",\"date\":\"1913-03-08\"},{\"title\":\"Coal Age 1913-03-15: Vol 3 Iss 11\",\"date\":\"1913-03-15\"},{\"title\":\"Coal Age 1913-04-26: Vol 3 Iss 17\",\"date\":\"1913-04-26\"},{\"title\":\"Coal Age 1919-05-01: Vol 15 Iss 18\",\"date\":\"1919-05-01\"},{\"title\":\"Coal Age 1925-04-23: Vol 27 Iss 17\",\"date\":\"1925-04-23\"},{\"title\":\"Coal Age 1925-05-07: Vol 27 Iss 19\",\"date\":\"1925-05-07\"},{\"title\":\"Coal Age 1925-10-01: Vol 28 Iss 14\",\"date\":\"1925-10-01\"},{\"title\":\"Coal Age 1925-10-08: Vol 28 Iss 15\",\"date\":\"1925-10-08\"},{\"title\":\"Coal Age 1925-11-05: Vol 28 Iss 19\",\"date\":\"1925-11-05\"},{\"title\":\"Coal Age 1926-03-11: Vol 29 Iss 10\",\"date\":\"1926-03-11\"},{\"title\":\"Coal Age 1948-07: Vol 53 Iss 7\",\"date\":\"1948-07-01\"},{\"title\":\"Coal Age 1987: Vol 92 Index\",\"date\":\"1987-01-01\"},{\"title\":\"Coal Age January-December 1936: Vol 41 Index\",\"date\":\"1936-01-01\"},{\"title\":\"Coal Age January-December 1962: Vol 67 Index\",\"date\":\"1962-01-01\"},{\"title\":\"Coal Age July 01-December 31, 1927: Vol 32 Index\",\"date\":\"1927-07-01\"},{\"title\":\"Coal Age 1911-12-23: Vol 1 Iss 11\",\"date\":\"1911-12-23\"},{\"title\":\"Coal Age 1916-05-06: Vol 9 Iss 19\",\"date\":\"1916-05-06\"},{\"title\":\"Coal Age 1917-10-13: Vol 12 Iss 15\",\"date\":\"1917-10-13\"},{\"title\":\"Coal Age 1918-01-05: Vol 13 Iss 1\",\"date\":\"1918-01-05\"},{\"title\":\"Coal Age 1921-03-10: Vol 19 Iss 10\",\"date\":\"1921-03-10\"},{\"title\":\"Coal Age 1924-09-25: Vol 26 Iss 13\",\"date\":\"1924-09-25\"},{\"title\":\"Coal Age 1951-12: Vol 56 Iss 12\",\"date\":\"1951-12-01\"},{\"title\":\"Coal Age January-December 1954: Vol 59 Index\",\"date\":\"1954-01-01\"},{\"title\":\"Coal Age 1932-12: Vol 37 Iss 12\",\"date\":\"1932-12-01\"},{\"title\":\"Coal Age 1933-12: Vol 38 Iss 12\",\"date\":\"1933-12-01\"},{\"title\":\"Coal Age 1935-04: Vol 40 Iss 4\",\"date\":\"1935-04-01\"},{\"title\":\"Coal Age 1928-05: Vol 33 Iss 5\",\"date\":\"1928-05-01\"},{\"title\":\"Coal Age 1942-10: Vol 47 Iss 10\",\"date\":\"1942-10-01\"},{\"title\":\"Coal Age 1945-05: Vol 50 Iss 5\",\"date\":\"1945-05-01\"},{\"title\":\"Coal Age 1945: Vol 50 Index\",\"date\":\"1945-01-01\"},{\"title\":\"Coal Age 1939-07: Vol 44 Iss 7\",\"date\":\"1939-07-01\"},{\"title\":\"Coal Age 1951-07: Vol 56 Iss 7\",\"date\":\"1951-07-01\"},{\"title\":\"Coal Age 1913-08-30: Vol 4 Iss 9\",\"date\":\"1913-08-30\"},{\"title\":\"Coal Age 1913-09-13: Vol 4 Iss 11\",\"date\":\"1913-09-13\"},{\"title\":\"Coal Age 1914-10-03: Vol 6 Iss 14\",\"date\":\"1914-10-03\"},{\"title\":\"Coal Age 1914-12-26: Vol 6 Iss 26\",\"date\":\"1914-12-26\"},{\"title\":\"Coal Age 1915-01-09: Vol 7 Iss 2\",\"date\":\"1915-01-09\"},{\"title\":\"Coal Age 1918-07-25: Vol 14 Iss 4\",\"date\":\"1918-07-25\"},{\"title\":\"Coal Age 1918-08-01: Vol 14 Iss 5\",\"date\":\"1918-08-01\"},{\"title\":\"Coal Age 1919-08-07: Vol 16 Iss 6\",\"date\":\"1919-08-07\"},{\"title\":\"Coal Age 1920-07-29: Vol 18 Iss 5\",\"date\":\"1920-07-29\"},{\"title\":\"Coal Age 1923-06-28: Vol 23 Iss 26\",\"date\":\"1923-06-28\"},{\"title\":\"Coal Age 1923-10-18: Vol 24 Iss 16\",\"date\":\"1923-10-18\"},{\"title\":\"Coal Age 1924-02-14: Vol 25 Iss 7\",\"date\":\"1924-02-14\"},{\"title\":\"Coal Age 1924-05-22: Vol 25 Iss 21\",\"date\":\"1924-05-22\"},{\"title\":\"Coal Age 1925-05-14: Vol 27 Iss 20\",\"date\":\"1925-05-14\"},{\"title\":\"Coal Age 1925-12-03: Vol 28 Iss 23\",\"date\":\"1925-12-03\"},{\"title\":\"Coal Age 1935-01: Vol 40 Iss 1\",\"date\":\"1935-01-01\"},{\"title\":\"Coal Age 1937-07: Vol 42 Iss 7\",\"date\":\"1937-07-01\"},{\"title\":\"Coal Age 1950-05: Vol 55 Iss 5\",\"date\":\"1950-05-01\"},{\"title\":\"Coal Age November 13-20, 1919: Vol 16 Iss 20\",\"date\":\"1919-11-13\"},{\"title\":\"Coal Age 1912: Vol 2 Index\",\"date\":\"1912-01-01\"},{\"title\":\"Coal Age 1913-07-12: Vol 4 Iss 2\",\"date\":\"1913-07-12\"},{\"title\":\"Coal Age 1917-03-17: Vol 11 Iss 11\",\"date\":\"1917-03-17\"},{\"title\":\"Coal Age 1917-05-26: Vol 11 Iss 21\",\"date\":\"1917-05-26\"},{\"title\":\"Coal Age 1917-09-08: Vol 12 Iss 10\",\"date\":\"1917-09-08\"},{\"title\":\"Coal Age 1921-08-04: Vol 20 Iss 5\",\"date\":\"1921-08-04\"},{\"title\":\"Coal Age 1926-06-03: Vol 29 Iss 22\",\"date\":\"1926-06-03\"},{\"title\":\"Coal Age 1928-10: Vol 33 Iss 10\",\"date\":\"1928-10-01\"},{\"title\":\"Coal Age 1929-05: Vol 34 Iss 5\",\"date\":\"1929-05-01\"},{\"title\":\"Coal Age 1929-08: Vol 34 Iss 8\",\"date\":\"1929-08-01\"},{\"title\":\"Coal Age 1940-04: Vol 45 Iss 4\",\"date\":\"1940-04-01\"},{\"title\":\"Coal Age 1942-04: Vol 47 Iss 4\",\"date\":\"1942-04-01\"},{\"title\":\"Coal Age 1942: Vol 47 Index\",\"date\":\"1942-01-01\"},{\"title\":\"Coal Age 1944-08: Vol 49 Iss 8\",\"date\":\"1944-08-01\"},{\"title\":\"Coal Age 1960-09: Vol 65 Iss 9\",\"date\":\"1960-09-01\"},{\"title\":\"Coal Age 1912-05-18: Vol 1 Iss 32\",\"date\":\"1912-05-18\"},{\"title\":\"Coal Age 1912-08-31: Vol 2 Iss 9\",\"date\":\"1912-08-31\"},{\"title\":\"Coal Age 1920-06-10: Vol 17 Iss 24\",\"date\":\"1920-06-10\"},{\"title\":\"Coal Age 1920-07-01: Vol 18 Iss 1\",\"date\":\"1920-07-01\"},{\"title\":\"Coal Age 1920-08-19: Vol 18 Iss 8\",\"date\":\"1920-08-19\"},{\"title\":\"Coal Age 1922-06-22: Vol 21 Iss 25\",\"date\":\"1922-06-22\"},{\"title\":\"Coal Age 1922-09-07: Vol 22 Iss 10\",\"date\":\"1922-09-07\"},{\"title\":\"Coal Age 1924-02-21: Vol 25 Iss 8\",\"date\":\"1924-02-21\"},{\"title\":\"Coal Age 1935-11: Vol 40 Iss 11\",\"date\":\"1935-11-01\"},{\"title\":\"Coal Age 1936-01: Vol 41 Iss 1\",\"date\":\"1936-01-01\"},{\"title\":\"Coal Age 1942-12: Vol 47 Iss 12\",\"date\":\"1942-12-01\"},{\"title\":\"Coal Age 1950-04: Vol 55 Iss 4\",\"date\":\"1950-04-01\"},{\"title\":\"Coal Age 1952-03: Vol 57 Iss 3\",\"date\":\"1952-03-01\"},{\"title\":\"Coal Age 1961-04: Vol 66 Iss 4\",\"date\":\"1961-04-01\"},{\"title\":\"Coal Age 1961-07: Vol 66 Iss 7\",\"date\":\"1961-07-01\"},{\"title\":\"Coal Age 1915-04-24: Vol 7 Iss 17\",\"date\":\"1915-04-24\"},{\"title\":\"Coal Age 1916-08-12: Vol 10 Iss 7\",\"date\":\"1916-08-12\"},{\"title\":\"Coal Age 1916-11-04: Vol 10 Iss 19\",\"date\":\"1916-11-04\"},{\"title\":\"Coal Age 1917-12-08: Vol 12 Iss 23\",\"date\":\"1917-12-08\"},{\"title\":\"Coal Age 1918-09-12: Vol 14 Iss 11\",\"date\":\"1918-09-12\"},{\"title\":\"Coal Age 1920-01-01: Vol 17 Iss 1\",\"date\":\"1920-01-01\"},{\"title\":\"Coal Age 1926-01-14: Vol 29 Iss 2\",\"date\":\"1926-01-14\"},{\"title\":\"Coal Age 1926-07-08: Vol 30 Iss 2\",\"date\":\"1926-07-08\"},{\"title\":\"Coal Age 1927-09: Vol 32 Iss 3\",\"date\":\"1927-09-01\"},{\"title\":\"Coal Age 1959-03: Vol 64 Iss 3\",\"date\":\"1959-03-01\"},{\"title\":\"Coal Age 1913-06-28: Vol 3 Iss 26\",\"date\":\"1913-06-28\"},{\"title\":\"Coal Age 1919-08-28: Vol 16 Iss 9\",\"date\":\"1919-08-28\"},{\"title\":\"Coal Age 1920-03-18: Vol 17 Iss 12\",\"date\":\"1920-03-18\"},{\"title\":\"Coal Age 1921-12-15: Vol 20 Iss 24\",\"date\":\"1921-12-15\"},{\"title\":\"Coal Age 1921-12-22: Vol 20 Iss 25\",\"date\":\"1921-12-22\"},{\"title\":\"Coal Age 1922-07-06: Vol 22 Iss 1\",\"date\":\"1922-07-06\"},{\"title\":\"Coal Age 1921-07-21: Vol 20 Iss 3\",\"date\":\"1921-07-21\"},{\"title\":\"Coal Age 1921-07-28: Vol 20 Iss 4\",\"date\":\"1921-07-28\"},{\"title\":\"Coal Age 1921-08-11: Vol 20 Iss 6\",\"date\":\"1921-08-11\"},{\"title\":\"Coal Age 1925-01-08: Vol 27 Iss 2\",\"date\":\"1925-01-08\"},{\"title\":\"Coal Age 1926-03-25: Vol 29 Iss 12\",\"date\":\"1926-03-25\"},{\"title\":\"Coal Age 1926-08-05: Vol 30 Iss 6\",\"date\":\"1926-08-05\"},{\"title\":\"Coal Age 1926-09-23: Vol 30 Iss 13\",\"date\":\"1926-09-23\"},{\"title\":\"Coal Age 1926-12-09: Vol 30 Iss 24\",\"date\":\"1926-12-09\"},{\"title\":\"Coal Age 1928-12: Vol 33 Iss 12\",\"date\":\"1928-12-01\"},{\"title\":\"Coal Age 1931-12: Vol 36 Iss 12\",\"date\":\"1931-12-01\"},{\"title\":\"Coal Age 1934-05: Vol 39 Iss 5\",\"date\":\"1934-05-01\"},{\"title\":\"Coal Age 1935-07: Vol 40 Iss 7\",\"date\":\"1935-07-01\"},{\"title\":\"Coal Age 1938-09: Vol 43 Iss 9\",\"date\":\"1938-09-01\"},{\"title\":\"Coal Age 1948-04: Vol 53 Iss 4\",\"date\":\"1948-04-01\"},{\"title\":\"Coal Age 1948-12: Vol 53 Iss 12\",\"date\":\"1948-12-01\"},{\"title\":\"Coal Age 1951-05: Vol 56 Iss 5\",\"date\":\"1951-05-01\"},{\"title\":\"Coal Age 1943-09: Vol 48 Iss 9\",\"date\":\"1943-09-01\"},{\"title\":\"Coal Age 1951-11: Vol 56 Iss 11\",\"date\":\"1951-11-01\"},{\"title\":\"Coal Age 1952-10: Vol 57 Iss 10\",\"date\":\"1952-10-01\"},{\"title\":\"Coal Age 1966: Vol 71 Index\",\"date\":\"1966-01-01\"},{\"title\":\"Coal Age 1985: Vol 90 Index\",\"date\":\"1985-01-01\"},{\"title\":\"Coal Age January 01-June 30, 1923: Vol 23 Index\",\"date\":\"1923-01-01\"},{\"title\":\"Coal Age January-December 1932: Vol 37 Index\",\"date\":\"1932-01-01\"},{\"title\":\"Coal Age 1957-02: Vol 62 Iss 2\",\"date\":\"1957-02-01\"},{\"title\":\"Coal Age 1957-12: Vol 62 Iss 12\",\"date\":\"1957-12-01\"},{\"title\":\"Coal Age 1958-10: Vol 63 Iss 10\",\"date\":\"1958-10-01\"},{\"title\":\"Coal Age 1911-10-14: Vol 1 Iss 1\",\"date\":\"1911-10-14\"},{\"title\":\"Coal Age 1911-10-21: Vol 1 Iss 2\",\"date\":\"1911-10-21\"},{\"title\":\"Coal Age 1911-11-11: Vol 1 Iss 5\",\"date\":\"1911-11-11\"},{\"title\":\"Coal Age 1911 - 1912: Vol 1 Index\",\"date\":\"1911-01-01\"},{\"title\":\"Coal Age 1912-02-24: Vol 1 Iss 20\",\"date\":\"1912-02-24\"},{\"title\":\"Coal Age 1913-09-27: Vol 4 Iss 13\",\"date\":\"1913-09-27\"},{\"title\":\"Coal Age 1913-10-04: Vol 4 Iss 14\",\"date\":\"1913-10-04\"},{\"title\":\"Coal Age 1913-11-15: Vol 4 Iss 20\",\"date\":\"1913-11-15\"},{\"title\":\"Coal Age 1914-02-14: Vol 5 Iss 7\",\"date\":\"1914-02-14\"},{\"title\":\"Coal Age 1914-04-18: Vol 5 Iss 16\",\"date\":\"1914-04-18\"},{\"title\":\"Coal Age 1916-01-22: Vol 9 Iss 4\",\"date\":\"1916-01-22\"},{\"title\":\"Coal Age 1912-01-06: Vol 1 Iss 13\",\"date\":\"1912-01-06\"},{\"title\":\"Coal Age 1918-05-04: Vol 13 Iss 18\",\"date\":\"1918-05-04\"},{\"title\":\"Coal Age 1924-07-10: Vol 26 Iss 2\",\"date\":\"1924-07-10\"},{\"title\":\"Coal Age 1925-05-28: Vol 27 Iss 22\",\"date\":\"1925-05-28\"},{\"title\":\"Coal Age 1925-09-24: Vol 28 Iss 13\",\"date\":\"1925-09-24\"},{\"title\":\"Coal Age 1926-04-15: Vol 29 Iss 15\",\"date\":\"1926-04-15\"},{\"title\":\"Coal Age 1952-12: Vol 57 Iss 12\",\"date\":\"1952-12-01\"},{\"title\":\"Coal Age January-December 1933: Vol 38 Index\",\"date\":\"1933-01-01\"},{\"title\":\"Coal Age January-December 1935: Vol 40 Index\",\"date\":\"1935-01-01\"},{\"title\":\"Coal Age 1912-07-06: Vol 2 Iss 1\",\"date\":\"1912-07-06\"},{\"title\":\"Coal Age 1912-06-01: Vol 1 Iss 34\",\"date\":\"1912-06-01\"},{\"title\":\"Coal Age 1915: Vol 7 Index\",\"date\":\"1915-01-01\"},{\"title\":\"Coal Age 1916-09-09: Vol 10 Iss 11\",\"date\":\"1916-09-09\"},{\"title\":\"Coal Age 1917-02-03: Vol 11 Iss 5\",\"date\":\"1917-02-03\"},{\"title\":\"Coal Age 1923-07-26: Vol 24 Iss 4\",\"date\":\"1923-07-26\"},{\"title\":\"Coal Age 1924-01-31: Vol 25 Iss 5\",\"date\":\"1924-01-31\"},{\"title\":\"Coal Age 1925-09-03: Vol 28 Iss 10\",\"date\":\"1925-09-03\"},{\"title\":\"Coal Age 1938-04: Vol 43 Iss 4\",\"date\":\"1938-04-01\"},{\"title\":\"Coal Age 1938-11: Vol 43 Iss 11\",\"date\":\"1938-11-01\"},{\"title\":\"Coal Age 1941-07: Vol 46 Iss 7\",\"date\":\"1941-07-01\"},{\"title\":\"Coal Age 1949-04: Vol 54 Iss 4\",\"date\":\"1949-04-01\"},{\"title\":\"Coal Age 1949-10: Vol 54 Iss 10\",\"date\":\"1949-10-01\"},{\"title\":\"Coal Age November 27 - December 4, 1919: Vol 16 Iss 21\",\"date\":\"1919-11-27\"},{\"title\":\"Coal Age 1914-04-04: Vol 5 Iss 14\",\"date\":\"1914-04-04\"},{\"title\":\"Coal Age 1918-09-19: Vol 14 Iss 12\",\"date\":\"1918-09-19\"},{\"title\":\"Coal Age 1919-04-03: Vol 15 Iss 14\",\"date\":\"1919-04-03\"},{\"title\":\"Coal Age 1927-12: Vol 32 Iss 6\",\"date\":\"1927-12-01\"},{\"title\":\"Coal Age 1928-03: Vol 33 Iss 3\",\"date\":\"1928-03-01\"},{\"title\":\"Coal Age 1952-02: Vol 57 Iss 2\",\"date\":\"1952-02-01\"},{\"title\":\"Coal Age 1952-09: Vol 57 Iss 9\",\"date\":\"1952-09-01\"},{\"title\":\"Coal Age 1953-04: Vol 58 Iss 4\",\"date\":\"1953-04-01\"},{\"title\":\"Coal Age 1953-09: Vol 58 Iss 9\",\"date\":\"1953-09-01\"},{\"title\":\"Coal Age 1983: Vol 88 Index\",\"date\":\"1983-01-01\"},{\"title\":\"Coal Age January 01-June 30, 1925: Vol 27 Index\",\"date\":\"1925-01-01\"},{\"title\":\"Coal Age 1958-02: Vol 63 Iss 2\",\"date\":\"1958-02-01\"},{\"title\":\"Coal Age 1959-09: Vol 64 Iss 9\",\"date\":\"1959-09-01\"},{\"title\":\"Coal Age 1960-08: Vol 65 Iss 8\",\"date\":\"1960-08-01\"},{\"title\":\"Coal Age 1914-11-21: Vol 6 Iss 21\",\"date\":\"1914-11-21\"},{\"title\":\"Coal Age 1915-03-20: Vol 7 Iss 12\",\"date\":\"1915-03-20\"},{\"title\":\"Coal Age 1915-07-10: Vol 8 Iss 2\",\"date\":\"1915-07-10\"},{\"title\":\"Coal Age 1915-09-25: Vol 8 Iss 13\",\"date\":\"1915-09-25\"},{\"title\":\"Coal Age 1917-08-18: Vol 12 Iss 7\",\"date\":\"1917-08-18\"},{\"title\":\"Coal Age 1917-12-01: Vol 12 Iss 22\",\"date\":\"1917-12-01\"},{\"title\":\"Coal Age 1922-11-09: Vol 22 Iss 19\",\"date\":\"1922-11-09\"},{\"title\":\"Coal Age 1925-02-26: Vol 27 Iss 9\",\"date\":\"1925-02-26\"},{\"title\":\"Coal Age 1926-06-24: Vol 29 Iss 25\",\"date\":\"1926-06-24\"},{\"title\":\"Coal Age 1926-08-26: Vol 30 Iss 9\",\"date\":\"1926-08-26\"},{\"title\":\"Coal Age 1927-03-31: Vol 31 Iss 13\",\"date\":\"1927-03-31\"},{\"title\":\"Coal Age 1944-02: Vol 49 Iss 2\",\"date\":\"1944-02-01\"},{\"title\":\"Coal Age 1945-04: Vol 50 Iss 4\",\"date\":\"1945-04-01\"},{\"title\":\"Coal Age 1913: Vol 4 Index\",\"date\":\"1913-01-01\"},{\"title\":\"Coal Age 1914-06-13: Vol 5 Iss 24\",\"date\":\"1914-06-13\"},{\"title\":\"Coal Age 1915-02-06: Vol 7 Iss 6\",\"date\":\"1915-02-06\"},{\"title\":\"Coal Age 1915-11-06: Vol 8 Iss 19\",\"date\":\"1915-11-06\"},{\"title\":\"Coal Age 1918-12-05: Vol 14 Iss 23\",\"date\":\"1918-12-05\"},{\"title\":\"Coal Age 1919-01-30: Vol 15 Iss 5\",\"date\":\"1919-01-30\"},{\"title\":\"Coal Age 1919-06-05: Vol 15 Iss 23\",\"date\":\"1919-06-05\"},{\"title\":\"Coal Age 1923-04-12: Vol 23 Iss 15\",\"date\":\"1923-04-12\"},{\"title\":\"Coal Age 1923-08-30: Vol 24 Iss 9\",\"date\":\"1923-08-30\"},{\"title\":\"Coal Age 1926-09-09: Vol 30 Iss 11\",\"date\":\"1926-09-09\"},{\"title\":\"Coal Age 1926-12-30: Vol 30 Iss 27\",\"date\":\"1926-12-30\"},{\"title\":\"Coal Age 1927-05-26: Vol 31 Iss 21\",\"date\":\"1927-05-26\"},{\"title\":\"Coal Age 1929-07: Vol 34 Iss 7\",\"date\":\"1929-07-01\"},{\"title\":\"Coal Age 1942-03: Vol 47 Iss 3\",\"date\":\"1942-03-01\"},{\"title\":\"Coal Age 1946-10: Vol 51 Iss 10\",\"date\":\"1946-10-01\"},{\"title\":\"Coal Age 1913-01-04: Vol 3 Iss 1\",\"date\":\"1913-01-04\"},{\"title\":\"Coal Age 1916-08-26: Vol 10 Iss 9\",\"date\":\"1916-08-26\"},{\"title\":\"Coal Age 1918-03-09: Vol 13 Iss 10\",\"date\":\"1918-03-09\"},{\"title\":\"Coal Age 1918-04-13: Vol 13 Iss 15\",\"date\":\"1918-04-13\"},{\"title\":\"Coal Age 1919-07-24: Vol 16 Iss 4\",\"date\":\"1919-07-24\"},{\"title\":\"Coal Age 1919-10-23: Vol 16 Iss 17\",\"date\":\"1919-10-23\"},{\"title\":\"Coal Age 1920-04-29: Vol 17 Iss 18\",\"date\":\"1920-04-29\"},{\"title\":\"Coal Age 1920-06-03: Vol 17 Iss 23\",\"date\":\"1920-06-03\"},{\"title\":\"Coal Age 1920-08-26: Vol 18 Iss 9\",\"date\":\"1920-08-26\"},{\"title\":\"Coal Age 1924-06-12: Vol 25 Iss 24\",\"date\":\"1924-06-12\"},{\"title\":\"Coal Age 1925-06-11: Vol 27 Iss 24\",\"date\":\"1925-06-11\"},{\"title\":\"Coal Age 1948-06: Vol 53 Iss 6\",\"date\":\"1948-06-01\"},{\"title\":\"Coal Age 1915-01-23: Vol 7 Iss 4\",\"date\":\"1915-01-23\"},{\"title\":\"Coal Age 1921-01-06: Vol 19 Iss 1\",\"date\":\"1921-01-06\"},{\"title\":\"Coal Age 1921-03-24: Vol 19 Iss 12\",\"date\":\"1921-03-24\"},{\"title\":\"Coal Age 1921-09-15: Vol 20 Iss 11\",\"date\":\"1921-09-15\"},{\"title\":\"Coal Age 1939-09: Vol 44 Iss 9\",\"date\":\"1939-09-01\"},{\"title\":\"Coal Age 1940-01: Vol 45 Iss 1\",\"date\":\"1940-01-01\"},{\"title\":\"Coal Age 1941-06: Vol 46 Iss 6\",\"date\":\"1941-06-01\"},{\"title\":\"Coal Age 1914-01-10: Vol 5 Iss 2\",\"date\":\"1914-01-10\"},{\"title\":\"Coal Age 1921-02-10: Vol 19 Iss 6\",\"date\":\"1921-02-10\"},{\"title\":\"Coal Age 1922-08-24: Vol 22 Iss 8\",\"date\":\"1922-08-24\"},{\"title\":\"Coal Age 1950-06: Vol 55 Iss 6\",\"date\":\"1950-06-01\"},{\"title\":\"Coal Age January-December 1930: Vol 35 Index\",\"date\":\"1930-01-01\"},{\"title\":\"Coal Age January-December 1953: Vol 58 Index\",\"date\":\"1953-01-01\"},{\"title\":\"Coal Age 1931-01: Vol 36 Iss 1\",\"date\":\"1931-01-01\"},{\"title\":\"Coal Age 1939-03: Vol 44 Iss 3\",\"date\":\"1939-03-01\"},{\"title\":\"Coal Age 1957-08: Vol 62 Iss 8\",\"date\":\"1957-08-01\"},{\"title\":\"Coal Age 1920-09-09: Vol 18 Iss 11\",\"date\":\"1920-09-09\"},{\"title\":\"Coal Age 1921-06-16: Vol 19 Iss 24\",\"date\":\"1921-06-16\"},{\"title\":\"Coal Age 1922-01-19: Vol 21 Iss 3\",\"date\":\"1922-01-19\"},{\"title\":\"Coal Age 1922-08-17: Vol 22 Iss 7\",\"date\":\"1922-08-17\"},{\"title\":\"Coal Age 1922-10-12: Vol 22 Iss 15\",\"date\":\"1922-10-12\"},{\"title\":\"Coal Age 1923-06-14: Vol 23 Iss 24\",\"date\":\"1923-06-14\"},{\"title\":\"Coal Age 1924-06-26: Vol 25 Iss 26\",\"date\":\"1924-06-26\"},{\"title\":\"Coal Age 1925-01-01: Vol 27 Iss 1\",\"date\":\"1925-01-01\"},{\"title\":\"Coal Age 1925-03-05: Vol 27 Iss 10\",\"date\":\"1925-03-05\"},{\"title\":\"Coal Age 1960-04: Vol 65 Iss 4\",\"date\":\"1960-04-01\"},{\"title\":\"Coal Age December 11-18, 1919: Vol 16 Iss 22\",\"date\":\"1919-12-11\"},{\"title\":\"Coal Age 1955-02: Vol 60 Iss 2\",\"date\":\"1955-02-01\"},{\"title\":\"Coal Age 1956-01: Vol 61 Iss 1\",\"date\":\"1956-01-01\"},{\"title\":\"Coal Age 1956-03: Vol 61 Iss 3\",\"date\":\"1956-03-01\"},{\"title\":\"Coal Age 1956-12: Vol 61 Iss 12\",\"date\":\"1956-12-01\"},{\"title\":\"Coal Age 1912-02-10: Vol 1 Iss 18\",\"date\":\"1912-02-10\"},{\"title\":\"Coal Age 1912-05-25: Vol 1 Iss 33\",\"date\":\"1912-05-25\"},{\"title\":\"Coal Age 1912-08-17: Vol 2 Iss 7\",\"date\":\"1912-08-17\"},{\"title\":\"Coal Age 1915-07-17: Vol 8 Iss 3\",\"date\":\"1915-07-17\"},{\"title\":\"Coal Age 1915-08-21: Vol 8 Iss 8\",\"date\":\"1915-08-21\"},{\"title\":\"Coal Age 1916-02-26: Vol 9 Iss 9\",\"date\":\"1916-02-26\"},{\"title\":\"Coal Age 1918-01-12: Vol 13 Iss 2\",\"date\":\"1918-01-12\"},{\"title\":\"Coal Age 1918-01-26: Vol 13 Iss 4\",\"date\":\"1918-01-26\"},{\"title\":\"Coal Age 1926-09-16: Vol 30 Iss 12\",\"date\":\"1926-09-16\"},{\"title\":\"Coal Age 1927-04-28: Vol 31 Iss 17\",\"date\":\"1927-04-28\"},{\"title\":\"Coal Age 1929-12: Vol 34 Iss 12\",\"date\":\"1929-12-01\"},{\"title\":\"Coal Age 1931-09: Vol 36 Iss 9\",\"date\":\"1931-09-01\"},{\"title\":\"Coal Age 1931-10: Vol 36 Iss 10\",\"date\":\"1931-10-01\"},{\"title\":\"Coal Age 1937-01: Vol 42 Iss 1\",\"date\":\"1937-01-01\"},{\"title\":\"Coal Age 1952-01: Vol 57 Iss 1\",\"date\":\"1952-01-01\"},{\"title\":\"Coal Age 1912-02-03: Vol 1 Iss 17\",\"date\":\"1912-02-03\"},{\"title\":\"Coal Age 1912-03-23: Vol 1 Iss 24\",\"date\":\"1912-03-23\"},{\"title\":\"Coal Age 1912-04-20: Vol 1 Iss 28\",\"date\":\"1912-04-20\"},{\"title\":\"Coal Age 1913-01-11: Vol 3 Iss 2\",\"date\":\"1913-01-11\"},{\"title\":\"Coal Age 1913-12-20: Vol 4 Iss 25\",\"date\":\"1913-12-20\"},{\"title\":\"Coal Age 1914-08-01: Vol 6 Iss 5\",\"date\":\"1914-08-01\"},{\"title\":\"Coal Age 1915-04-03: Vol 7 Iss 14\",\"date\":\"1915-04-03\"},{\"title\":\"Coal Age 1915-10-16: Vol 8 Iss 16\",\"date\":\"1915-10-16\"},{\"title\":\"Coal Age 1925-06-18: Vol 27 Iss 25\",\"date\":\"1925-06-18\"},{\"title\":\"Coal Age 1923-07-05: Vol 24 Iss 1\",\"date\":\"1923-07-05\"},{\"title\":\"Coal Age 1925-03-12: Vol 27 Iss 11\",\"date\":\"1925-03-12\"},{\"title\":\"Coal Age 1938-01: Vol 43 Iss 1\",\"date\":\"1938-01-01\"},{\"title\":\"Coal Age 1939-11: Vol 44 Iss 11\",\"date\":\"1939-11-01\"},{\"title\":\"Coal Age 1954-05: Vol 59 Iss 5\",\"date\":\"1954-05-01\"},{\"title\":\"Coal Age 1955-06: Vol 60 Iss 6\",\"date\":\"1955-06-01\"},{\"title\":\"Coal Age 1956-05: Vol 61 Iss 5\",\"date\":\"1956-05-01\"},{\"title\":\"Coal Age 1914-07-11: Vol 6 Iss 2\",\"date\":\"1914-07-11\"},{\"title\":\"Coal Age 1914-07-25: Vol 6 Iss 4\",\"date\":\"1914-07-25\"},{\"title\":\"Coal Age 1915-01-16: Vol 7 Iss 3\",\"date\":\"1915-01-16\"},{\"title\":\"Coal Age 1915-05-08: Vol 7 Iss 19\",\"date\":\"1915-05-08\"},{\"title\":\"Coal Age 1915-07-03: Vol 8 Iss 1\",\"date\":\"1915-07-03\"},{\"title\":\"Coal Age 1916-02-12: Vol 9 Iss 7\",\"date\":\"1916-02-12\"},{\"title\":\"Coal Age 1916-02-19: Vol 9 Iss 8\",\"date\":\"1916-02-19\"},{\"title\":\"Coal Age 1920-05-13: Vol 17 Iss 20\",\"date\":\"1920-05-13\"},{\"title\":\"Coal Age 1920-11-11: Vol 18 Iss 20\",\"date\":\"1920-11-11\"},{\"title\":\"Coal Age 1922-09-21: Vol 22 Iss 12\",\"date\":\"1922-09-21\"},{\"title\":\"Coal Age 1923-01-18: Vol 23 Iss 3\",\"date\":\"1923-01-18\"},{\"title\":\"Coal Age 1923-08-16: Vol 24 Iss 7\",\"date\":\"1923-08-16\"},{\"title\":\"Coal Age 1923-10-04: Vol 24 Iss 14\",\"date\":\"1923-10-04\"},{\"title\":\"Coal Age 1924-07-03: Vol 26 Iss 1\",\"date\":\"1924-07-03\"},{\"title\":\"Coal Age 1946-11: Vol 51 Iss 11\",\"date\":\"1946-11-01\"},{\"title\":\"Coal Age 1948-02: Vol 53 Iss 2\",\"date\":\"1948-02-01\"},{\"title\":\"Coal Age 1949-09: Vol 54 Iss 9\",\"date\":\"1949-09-01\"},{\"title\":\"Coal Age 1951-01: Vol 56 Iss 1\",\"date\":\"1951-01-01\"},{\"title\":\"Coal Age 1961-05: Vol 66 Iss 5\",\"date\":\"1961-05-01\"},{\"title\":\"Coal Age 1961-09: Vol 66 Iss 9\",\"date\":\"1961-09-01\"},{\"title\":\"Coal Age 1968: Vol 73 Index\",\"date\":\"1968-01-01\"},{\"title\":\"Coal Age 1954-01: Vol 59 Iss 1\",\"date\":\"1954-01-01\"},{\"title\":\"Coal Age 1954-02: Vol 59 Iss 2\",\"date\":\"1954-02-01\"},{\"title\":\"Coal Age 1954-03: Vol 59 Iss 3\",\"date\":\"1954-03-01\"},{\"title\":\"Coal Age 1954-11: Vol 59 Iss 11\",\"date\":\"1954-11-01\"},{\"title\":\"Coal Age 1955-12: Vol 60 Iss 12\",\"date\":\"1955-12-01\"},{\"title\":\"Coal Age 1959-04: Vol 64 Iss 4\",\"date\":\"1959-04-01\"},{\"title\":\"Coal Age 1912-10-19: Vol 2 Iss 16\",\"date\":\"1912-10-19\"},{\"title\":\"Coal Age 1919-03-20: Vol 15 Iss 12\",\"date\":\"1919-03-20\"},{\"title\":\"Coal Age 1925-07-16: Vol 28 Iss 3\",\"date\":\"1925-07-16\"},{\"title\":\"Coal Age 1926-11-25: Vol 30 Iss 22\",\"date\":\"1926-11-25\"},{\"title\":\"Coal Age 1933-01: Vol 38 Iss 1\",\"date\":\"1933-01-01\"},{\"title\":\"Coal Age 1933-11: Vol 38 Iss 11\",\"date\":\"1933-11-01\"},{\"title\":\"Coal Age 1917-09-01: Vol 12 Iss 9\",\"date\":\"1917-09-01\"},{\"title\":\"Coal Age 1917-09-15: Vol 12 Iss 11\",\"date\":\"1917-09-15\"},{\"title\":\"Coal Age 1918-07-13: Vol 14 Iss 2\",\"date\":\"1918-07-13\"},{\"title\":\"Coal Age 1919: Vol 15 Index\",\"date\":\"1919-01-01\"},{\"title\":\"Coal Age 1947-12: Vol 52 Iss 12\",\"date\":\"1947-12-01\"},{\"title\":\"Coal Age 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1922-03-18: Vol 113 Iss 11\",\"date\":\"1922-03-18\"},{\"title\":\"Engineering and Mining Journal-Press 1922-06-03: Vol 113 Iss 22\",\"date\":\"1922-06-03\"},{\"title\":\"Engineering and Mining Journal 1928-04-21: Vol 125 Iss 16\",\"date\":\"1928-04-21\"},{\"title\":\"Engineering and Mining Journal-Press 1925-09-19: Vol 120 Iss 12\",\"date\":\"1925-09-19\"},{\"title\":\"Engineering and Mining Journal-Press 1926-01-30: Vol 121 Iss 5\",\"date\":\"1926-01-30\"},{\"title\":\"Engineering and Mining Journal-Press 1926-06-05: Vol 121 Iss 23\",\"date\":\"1926-06-05\"},{\"title\":\"Engineering and Mining Journal 1926-10-09: Vol 122 Iss 15\",\"date\":\"1926-10-09\"},{\"title\":\"Engineering and Mining Journal 1929-05-25: Vol 127 Iss 21\",\"date\":\"1929-05-25\"},{\"title\":\"Engineering and Mining Journal 1929-10-12: Vol 128 Iss 15\",\"date\":\"1929-10-12\"},{\"title\":\"Engineering and Mining Journal 1930-02-24: Vol 129 Iss 4\",\"date\":\"1930-02-24\"},{\"title\":\"Engineering and Mining Journal 1933-03: Vol 134 Iss 3\",\"date\":\"1933-03-01\"},{\"title\":\"Engineering and Mining Journal 1933-04: Vol 134 Iss 4\",\"date\":\"1933-04-01\"},{\"title\":\"Engineering and Mining Journal 1956-01: Vol 157 Iss 1\",\"date\":\"1956-01-01\"},{\"title\":\"Engineering and Mining Journal 1956-07: Vol 157 Iss 7\",\"date\":\"1956-07-01\"},{\"title\":\"The Engineering and Mining Journal 1892-02-06: Vol 53 Iss 6\",\"date\":\"1892-02-06\"},{\"title\":\"The Engineering and Mining Journal 1892-04-23: Vol 53 Iss 17\",\"date\":\"1892-04-23\"},{\"title\":\"The Engineering and Mining Journal 1893-06-17: Vol 55 Iss 24\",\"date\":\"1893-06-17\"},{\"title\":\"The Engineering and Mining Journal 1893-10-07: Vol 56 Iss 15\",\"date\":\"1893-10-07\"},{\"title\":\"The Engineering and Mining Journal 1902-05-17: Vol 73 Iss 20\",\"date\":\"1902-05-17\"},{\"title\":\"The Engineering and Mining Journal 1903-03-28: Vol 75 Iss 13\",\"date\":\"1903-03-28\"},{\"title\":\"The Engineering and Mining Journal 1899-02-18: Vol 67 Iss 7\",\"date\":\"1899-02-18\"},{\"title\":\"The Engineering and Mining Journal 1907-09-07: Vol 84 Iss 10\",\"date\":\"1907-09-07\"},{\"title\":\"The Engineering and Mining Journal 1907-10-26: Vol 84 Iss 17\",\"date\":\"1907-10-26\"},{\"title\":\"The Engineering and Mining Journal 1908-02-15: Vol 85 Iss 7\",\"date\":\"1908-02-15\"},{\"title\":\"The Engineering and Mining Journal 1904-10-06: Vol 78 Iss 14\",\"date\":\"1904-10-06\"},{\"title\":\"The Engineering and Mining Journal 1905-08-19: Vol 80 Iss 7\",\"date\":\"1905-08-19\"},{\"title\":\"The Engineering and Mining Journal 1915-01-16: Vol 99 Iss 3\",\"date\":\"1915-01-16\"},{\"title\":\"The Engineering and Mining Journal 1912-09-07: Vol 94 Iss 10\",\"date\":\"1912-09-07\"},{\"title\":\"Engineering and Mining Journal 1917-05-12: Vol 103 Iss 19\",\"date\":\"1917-05-12\"},{\"title\":\"Engineering and Mining Journal 1917-06-30: Vol 103 Iss 26\",\"date\":\"1917-06-30\"},{\"title\":\"Engineering and Mining Journal 1917-08-11: Vol 104 Iss 6\",\"date\":\"1917-08-11\"},{\"title\":\"Engineering and Mining Journal 1920-11-13: Vol 110 Iss 20\",\"date\":\"1920-11-13\"},{\"title\":\"Engineering and Mining Journal 1921-04-02: Vol 111 Iss 14\",\"date\":\"1921-04-02\"},{\"title\":\"Engineering and Mining Journal 1921-07-16: Vol 112 Iss 3\",\"date\":\"1921-07-16\"},{\"title\":\"Engineering and Mining Journal 1918-05-25: Vol 105 Iss 21\",\"date\":\"1918-05-25\"},{\"title\":\"Engineering and Mining Journal 1918-12-14: Vol 106 Iss 24\",\"date\":\"1918-12-14\"},{\"title\":\"Engineering and Mining Journal-Press 1923-07-28: Vol 116 Iss 4\",\"date\":\"1923-07-28\"},{\"title\":\"Engineering and Mining Journal-Press 1923-09-01: Vol 116 Iss 9\",\"date\":\"1923-09-01\"},{\"title\":\"Engineering and Mining Journal-Press 1924-03-29: Vol 117 Iss 13\",\"date\":\"1924-03-29\"},{\"title\":\"Engineering and Mining Journal-Press 1924-07-05: Vol 118 Iss 1\",\"date\":\"1924-07-05\"},{\"title\":\"Engineering and Mining 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Journal 1917-03-31: Vol 103 Iss 13\",\"date\":\"1917-03-31\"},{\"title\":\"Engineering and Mining Journal-Press 1924-11-15: Vol 118 Iss 20\",\"date\":\"1924-11-15\"},{\"title\":\"Engineering and Mining Journal 1926-09-11: Vol 122 Iss 11\",\"date\":\"1926-09-11\"},{\"title\":\"Engineering and Mining Journal 1927-06-04: Vol 123 Iss 23\",\"date\":\"1927-06-04\"},{\"title\":\"Engineering and Mining Journal 1921: Vol 112 Index\",\"date\":\"1921-01-01\"},{\"title\":\"Engineering and Mining Journal 1940-02: Vol 141 Iss 2\",\"date\":\"1940-02-01\"},{\"title\":\"Engineering and Mining Journal 1940-04: Vol 141 Iss 4\",\"date\":\"1940-04-01\"},{\"title\":\"The Engineering and Mining Journal 1884-06-21: Vol 37 Iss 25\",\"date\":\"1884-06-21\"},{\"title\":\"The Engineering and Mining Journal 1884-08-23: Vol 38 Iss 8\",\"date\":\"1884-08-23\"},{\"title\":\"The Engineering and Mining Journal 1893-11-04: Vol 56 Iss 19\",\"date\":\"1893-11-04\"},{\"title\":\"The Engineering and Mining Journal 1894-01-13: Vol 57 Iss 2\",\"date\":\"1894-01-13\"},{\"title\":\"The Engineering and Mining Journal 1913-03-01: Vol 95 Iss 9\",\"date\":\"1913-03-01\"},{\"title\":\"Engineering and Mining Journal-Press 1924-01-19: Vol 117 Iss 3\",\"date\":\"1924-01-19\"},{\"title\":\"Engineering and Mining Journal-Press 1923-03-24: Vol 115 Iss 12\",\"date\":\"1923-03-24\"},{\"title\":\"Engineering and Mining Journal 1930-01-23: Vol 129 Iss 2\",\"date\":\"1930-01-23\"},{\"title\":\"Engineering and Mining Journal 1951-05: Vol 152 Iss 5\",\"date\":\"1951-05-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1883: Vol 35 Index\",\"date\":\"1883-01-01\"},{\"title\":\"American Journal of Mining 1866-06-02: Vol 1 Iss 10\",\"date\":\"1866-06-02\"},{\"title\":\"The Engineering and Mining Journal 1882-10-28: Vol 34 Iss 18\",\"date\":\"1882-10-28\"},{\"title\":\"The Engineering and Mining Journal 1882-07-15: Vol 34 Iss 3\",\"date\":\"1882-07-15\"},{\"title\":\"The Engineering and Mining Journal 1887-04-16: Vol 43 Iss 16\",\"date\":\"1887-04-16\"},{\"title\":\"The Engineering and Mining Journal 1887-08-13: Vol 44 Iss 7\",\"date\":\"1887-08-13\"},{\"title\":\"The Engineering and Mining Journal 1889-11-16: Vol 48 Iss 20\",\"date\":\"1889-11-16\"},{\"title\":\"The Engineering and Mining Journal 1892-10-01: Vol 54 Iss 14\",\"date\":\"1892-10-01\"},{\"title\":\"The Engineering and Mining Journal 1907-06-15: Vol 83 Iss 24\",\"date\":\"1907-06-15\"},{\"title\":\"The Engineering and Mining Journal 1908-01-18: Vol 85 Iss 3\",\"date\":\"1908-01-18\"},{\"title\":\"The Engineering and Mining Journal 1912-02-10: Vol 93 Iss 6\",\"date\":\"1912-02-10\"},{\"title\":\"The Engineering and Mining Journal 1912-06-22: Vol 93 Iss 25\",\"date\":\"1912-06-22\"},{\"title\":\"The Engineering and Mining Journal 1912-11-09: Vol 94 Iss 19\",\"date\":\"1912-11-09\"},{\"title\":\"Engineering and Mining Journal 1918-12-21: Vol 106 Iss 25\",\"date\":\"1918-12-21\"},{\"title\":\"Engineering and Mining Journal 1919-04-19: Vol 107 Iss 16\",\"date\":\"1919-04-19\"},{\"title\":\"Engineering and Mining Journal 1928-02-18: Vol 125 Iss 7\",\"date\":\"1928-02-18\"},{\"title\":\"Engineering and Mining Journal 1950-08: Vol 151 Iss 8\",\"date\":\"1950-08-01\"},{\"title\":\"Engineering and Mining Journal 1937-04: Vol 138 Iss 4\",\"date\":\"1937-04-01\"},{\"title\":\"Engineering and Mining Journal January-December 1944: Vol 145 Index\",\"date\":\"1944-01-01\"},{\"title\":\"American Journal of Mining 1868-02-22: Vol 5 Iss 8\",\"date\":\"1868-02-22\"},{\"title\":\"The Engineering and Mining Journal 1870-08-16: Vol 10 Iss 7\",\"date\":\"1870-08-16\"},{\"title\":\"The Engineering and Mining Journal 1874-07-18: Vol 18 Iss 3\",\"date\":\"1874-07-18\"},{\"title\":\"The Engineering and Mining Journal 1880-03-13: Vol 29 Iss 11\",\"date\":\"1880-03-13\"},{\"title\":\"The Engineering and Mining Journal 1888-12-08: Vol 46 Iss 23\",\"date\":\"1888-12-08\"},{\"title\":\"The Engineering and Mining Journal 1897-05-15: Vol 63 Iss 20\",\"date\":\"1897-05-15\"},{\"title\":\"The Engineering and Mining Journal 1902-09-13: Vol 74 Iss 11\",\"date\":\"1902-09-13\"},{\"title\":\"The Engineering and Mining Journal 1908-03-28: Vol 85 Iss 13\",\"date\":\"1908-03-28\"},{\"title\":\"Engineering and Mining Journal 1916-09-02: Vol 102 Iss 10\",\"date\":\"1916-09-02\"},{\"title\":\"The Engineering and Mining Journal 1911-10-21: Vol 92 Iss 17\",\"date\":\"1911-10-21\"},{\"title\":\"Engineering and Mining Journal 1921-05-07: Vol 111 Iss 19\",\"date\":\"1921-05-07\"},{\"title\":\"Engineering and Mining Journal-Press 1922-07-29: Vol 114 Iss 5\",\"date\":\"1922-07-29\"},{\"title\":\"Engineering and Mining Journal-Press 1922-08-19: Vol 114 Iss 8\",\"date\":\"1922-08-19\"},{\"title\":\"The Engineering and Mining Journal January-June 1908: Vol 85 Index\",\"date\":\"1908-01-01\"},{\"title\":\"American Journal of Mining 1866-07-07: Vol 1 Iss 15\",\"date\":\"1866-07-07\"},{\"title\":\"American Journal of Mining 1868-04-25: Vol 5 Iss 17\",\"date\":\"1868-04-25\"},{\"title\":\"American Journal of Mining 1868-06-27: Vol 5 Iss 26\",\"date\":\"1868-06-27\"},{\"title\":\"American Journal of Mining 1868-11-21: Vol 6 Iss 21\",\"date\":\"1868-11-21\"},{\"title\":\"The Engineering and Mining Journal 1869-11-16: Vol 8 Iss 20\",\"date\":\"1869-11-16\"},{\"title\":\"The Engineering and Mining Journal 1870-03-15: Vol 9 Iss 11\",\"date\":\"1870-03-15\"},{\"title\":\"The Engineering and Mining Journal 1877-01-06: Vol 23 Iss 1\",\"date\":\"1877-01-06\"},{\"title\":\"The Engineering and Mining Journal 1877-05-19: Vol 23 Iss 20\",\"date\":\"1877-05-19\"},{\"title\":\"The Engineering and Mining Journal 1874-08-01: Vol 18 Iss 5\",\"date\":\"1874-08-01\"},{\"title\":\"The Engineering and Mining Journal 1878-11-02: Vol 26 Iss 18\",\"date\":\"1878-11-02\"},{\"title\":\"The Engineering and Mining Journal 1878-12-21: Vol 26 Iss 25\",\"date\":\"1878-12-21\"},{\"title\":\"The Engineering and Mining Journal 1882-12-30: Vol 34 Iss 27\",\"date\":\"1882-12-30\"},{\"title\":\"The Engineering and Mining Journal 1883-05-12: Vol 35 Iss 19\",\"date\":\"1883-05-12\"},{\"title\":\"The Engineering and Mining Journal 1883-05-26: Vol 35 Iss 21\",\"date\":\"1883-05-26\"},{\"title\":\"The Engineering and Mining Journal 1883-09-15: Vol 36 Iss 11\",\"date\":\"1883-09-15\"},{\"title\":\"The Engineering and Mining Journal 1885-11-28: Vol 40 Iss 22\",\"date\":\"1885-11-28\"},{\"title\":\"The Engineering and Mining Journal 1886-06-05: Vol 41 Iss 23\",\"date\":\"1886-06-05\"},{\"title\":\"The Engineering and Mining Journal 1891-12-19: Vol 52 Iss 25\",\"date\":\"1891-12-19\"},{\"title\":\"The Engineering and Mining Journal 1892-02-27: Vol 53 Iss 9\",\"date\":\"1892-02-27\"},{\"title\":\"The Engineering and Mining Journal 1892-05-21: Vol 53 Iss 21\",\"date\":\"1892-05-21\"},{\"title\":\"The Engineering and Mining Journal 1892-06-04: Vol 53 Iss 23\",\"date\":\"1892-06-04\"},{\"title\":\"The Engineering and Mining Journal 1893-05-13: Vol 55 Iss 19\",\"date\":\"1893-05-13\"},{\"title\":\"The Engineering and Mining Journal 1902-03-08: Vol 73 Iss 10\",\"date\":\"1902-03-08\"},{\"title\":\"The Engineering and Mining Journal 1902-10-11: Vol 74 Iss 15\",\"date\":\"1902-10-11\"},{\"title\":\"The Engineering and Mining Journal 1903-01-10: Vol 75 Iss 2\",\"date\":\"1903-01-10\"},{\"title\":\"The Engineering and Mining Journal 1900-03-03: Vol 69 Iss 9\",\"date\":\"1900-03-03\"},{\"title\":\"The Engineering and Mining Journal 1900-09-15: Vol 70 Iss 11\",\"date\":\"1900-09-15\"},{\"title\":\"The Engineering and Mining Journal 1900-11-10: Vol 70 Iss 19\",\"date\":\"1900-11-10\"},{\"title\":\"The Engineering and Mining Journal 1906-02-17: Vol 81 Iss 7\",\"date\":\"1906-02-17\"},{\"title\":\"The Engineering and Mining Journal 1906-12-22: Vol 82 Iss 25\",\"date\":\"1906-12-22\"},{\"title\":\"The Engineering and Mining Journal 1907-03-30: Vol 83 Iss 13\",\"date\":\"1907-03-30\"},{\"title\":\"The Engineering and Mining Journal 1907-05-18: Vol 83 Iss 20\",\"date\":\"1907-05-18\"},{\"title\":\"The Engineering and Mining Journal 1908-03-07: Vol 85 Iss 10\",\"date\":\"1908-03-07\"},{\"title\":\"The Engineering and Mining Journal 1904-12-22: Vol 78 Iss 25\",\"date\":\"1904-12-22\"},{\"title\":\"The Engineering and Mining Journal 1905-06-22: Vol 79 Iss 25\",\"date\":\"1905-06-22\"},{\"title\":\"The Engineering and Mining Journal 1913-08-30: Vol 96 Iss 9\",\"date\":\"1913-08-30\"},{\"title\":\"The Engineering and Mining Journal 1911-12-30: Vol 92 Iss 27\",\"date\":\"1911-12-30\"},{\"title\":\"The Engineering and Mining Journal 1913-01-25: Vol 95 Iss 4\",\"date\":\"1913-01-25\"},{\"title\":\"The Engineering and Mining Journal 1913-04-19: Vol 95 Iss 16\",\"date\":\"1913-04-19\"},{\"title\":\"Engineering and Mining Journal 1918-08-31: Vol 106 Iss 9\",\"date\":\"1918-08-31\"},{\"title\":\"Engineering and Mining Journal-Press 1923: Vol 116 Index\",\"date\":\"1923-01-01\"},{\"title\":\"Engineering and Mining Journal-Press 1924-02-16: Vol 117 Iss 7\",\"date\":\"1924-02-16\"},{\"title\":\"Engineering and Mining Journal-Press 1924-03-01: Vol 117 Iss 9\",\"date\":\"1924-03-01\"},{\"title\":\"Engineering and Mining Journal 1922-03-25: Vol 113 Iss 12\",\"date\":\"1922-03-25\"},{\"title\":\"Engineering and Mining Journal-Press 1922-05-27: Vol 113 Iss 21\",\"date\":\"1922-05-27\"},{\"title\":\"Engineering and Mining Journal-Press 1922-07-22: Vol 114 Iss 4\",\"date\":\"1922-07-22\"},{\"title\":\"Engineering and Mining Journal-Press 1923-03-10: Vol 115 Iss 10\",\"date\":\"1923-03-10\"},{\"title\":\"Engineering and Mining Journal 1928-01-14: Vol 125 Iss 2\",\"date\":\"1928-01-14\"},{\"title\":\"Engineering and Mining Journal 1928-06-09: Vol 125 Iss 23\",\"date\":\"1928-06-09\"},{\"title\":\"Engineering and Mining Journal 1928-09-08: Vol 126 Iss 10\",\"date\":\"1928-09-08\"},{\"title\":\"Engineering and Mining Journal 1929-05-04: Vol 127 Iss 18\",\"date\":\"1929-05-04\"},{\"title\":\"Engineering and Mining Journal 1930-03-08: Vol 129 Iss 5\",\"date\":\"1930-03-08\"},{\"title\":\"Engineering and Mining Journal 1949-04: Vol 150 Iss 4\",\"date\":\"1949-04-01\"},{\"title\":\"Engineering and Mining Journal 1949-11: Vol 150 Iss 11\",\"date\":\"1949-11-01\"},{\"title\":\"Engineering and Mining Journal 1950-01: Vol 151 Iss 1\",\"date\":\"1950-01-01\"},{\"title\":\"Engineering and Mining Journal 1950-02: Vol 151 Iss 2\",\"date\":\"1950-02-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1885: Vol 40 Index\",\"date\":\"1885-07-01\"},{\"title\":\"Engineering and Mining Journal 1955-02: Vol 156 Iss 2\",\"date\":\"1955-02-01\"},{\"title\":\"American Journal of Mining 1866-08-25: Vol 1 Iss 22\",\"date\":\"1866-08-25\"},{\"title\":\"American Journal of Mining 1866-09-29: Vol 2 Iss 1\",\"date\":\"1866-09-29\"},{\"title\":\"American Journal of Mining 1868-03-14: Vol 5 Iss 11\",\"date\":\"1868-03-14\"},{\"title\":\"American Journal of Mining 1868-04-18: Vol 5 Iss 16\",\"date\":\"1868-04-18\"},{\"title\":\"American Journal of Mining 1868-07-04: Vol 6 Iss 1\",\"date\":\"1868-07-04\"},{\"title\":\"American Journal of Mining 1868-12-26: Vol 6 Iss 26\",\"date\":\"1868-12-26\"},{\"title\":\"American Journal of Mining 1869-01-02: Vol 7 Iss 1\",\"date\":\"1869-01-02\"},{\"title\":\"American Journal of Mining 1869-03-27: Vol 7 Iss 13\",\"date\":\"1869-03-27\"},{\"title\":\"The Engineering and Mining Journal 1871-01-24: Vol 11 Iss 4\",\"date\":\"1871-01-24\"},{\"title\":\"The Engineering and Mining Journal 1871-07-11: Vol 12 Iss 2\",\"date\":\"1871-07-11\"},{\"title\":\"The Engineering and Mining Journal 1871-11-14: Vol 12 Iss 20\",\"date\":\"1871-11-14\"},{\"title\":\"The Engineering and Mining Journal 1872-01-23: Vol 13 Iss 4\",\"date\":\"1872-01-23\"},{\"title\":\"The Engineering and Mining Journal 1872-03-12: Vol 13 Iss 11\",\"date\":\"1872-03-12\"},{\"title\":\"The Engineering and Mining Journal 1873-02-18: Vol 15 Iss 7\",\"date\":\"1873-02-18\"},{\"title\":\"The Engineering and Mining Journal 1879-09-20: Vol 28 Iss 12\",\"date\":\"1879-09-20\"},{\"title\":\"The Engineering and Mining Journal 1880-02-14: Vol 29 Iss 7\",\"date\":\"1880-02-14\"},{\"title\":\"The Engineering and Mining Journal 1878-06-15: Vol 25 Iss 24\",\"date\":\"1878-06-15\"},{\"title\":\"The Engineering and Mining Journal 1878-10-26: Vol 26 Iss 17\",\"date\":\"1878-10-26\"},{\"title\":\"The Engineering and Mining Journal 1879-01-04: Vol 27 Iss 1\",\"date\":\"1879-01-04\"},{\"title\":\"The Engineering and Mining Journal 1889-06-15: Vol 47 Iss 24\",\"date\":\"1889-06-15\"},{\"title\":\"The Engineering and Mining Journal 1889-06-29: Vol 47 Iss 26\",\"date\":\"1889-06-29\"},{\"title\":\"The Engineering and Mining Journal 1888-02-04: Vol 45 Iss 5\",\"date\":\"1888-02-04\"},{\"title\":\"The Engineering and Mining Journal 1888-08-18: Vol 46 Iss 7\",\"date\":\"1888-08-18\"},{\"title\":\"The Engineering and Mining Journal 1889-01-05: Vol 47 Iss 1\",\"date\":\"1889-01-05\"},{\"title\":\"The Engineering and Mining Journal 1890-08-02: Vol 50 Iss 5\",\"date\":\"1890-08-02\"},{\"title\":\"The Engineering and Mining Journal 1890-10-18: Vol 50 Iss 16\",\"date\":\"1890-10-18\"},{\"title\":\"The Engineering and Mining Journal 1891-07-25: Vol 52 Iss 4\",\"date\":\"1891-07-25\"},{\"title\":\"The Engineering and Mining Journal 1891-08-22: Vol 52 Iss 8\",\"date\":\"1891-08-22\"},{\"title\":\"The Engineering and Mining Journal 1897-04-03: Vol 63 Iss 14\",\"date\":\"1897-04-03\"},{\"title\":\"The Engineering and Mining Journal 1898-01-01: Vol 65 Iss 1\",\"date\":\"1898-01-01\"},{\"title\":\"The Engineering and Mining Journal 1898-04-09: Vol 65 Iss 15\",\"date\":\"1898-04-09\"},{\"title\":\"The Engineering and Mining Journal 1898-05-28: Vol 65 Iss 22\",\"date\":\"1898-05-28\"},{\"title\":\"The Engineering and Mining Journal 1898-08-20: Vol 66 Iss 8\",\"date\":\"1898-08-20\"},{\"title\":\"The Engineering and Mining Journal 1898-09-24: Vol 66 Iss 13\",\"date\":\"1898-09-24\"},{\"title\":\"The Engineering and Mining Journal 1899-01-07: Vol 67 Iss 1\",\"date\":\"1899-01-07\"},{\"title\":\"The Engineering and Mining Journal 1899-03-11: Vol 67 Iss 10\",\"date\":\"1899-03-11\"},{\"title\":\"The Engineering and Mining Journal 1901-01-12: Vol 71 Iss 2\",\"date\":\"1901-01-12\"},{\"title\":\"The Engineering and Mining Journal 1901-01-19: Vol 71 Iss 3\",\"date\":\"1901-01-19\"},{\"title\":\"The Engineering and Mining Journal 1901-02-16: Vol 71 Iss 7\",\"date\":\"1901-02-16\"},{\"title\":\"The Engineering and Mining Journal 1901-06-08: Vol 71 Iss 23\",\"date\":\"1901-06-08\"},{\"title\":\"The Engineering and Mining Journal 1913-10-11: Vol 96 Iss 15\",\"date\":\"1913-10-11\"},{\"title\":\"The Engineering and Mining Journal 1914-04-18: Vol 97 Iss 16\",\"date\":\"1914-04-18\"},{\"title\":\"The Engineering and Mining Journal 1909-09-18: Vol 88 Iss 12\",\"date\":\"1909-09-18\"},{\"title\":\"The Engineering and Mining Journal 1909-12-18: Vol 88 Iss 25\",\"date\":\"1909-12-18\"},{\"title\":\"The Engineering and Mining Journal 1910-07-16: Vol 90 Iss 3\",\"date\":\"1910-07-16\"},{\"title\":\"The Engineering and Mining Journal 1916-01-29: Vol 101 Iss 5\",\"date\":\"1916-01-29\"},{\"title\":\"Engineering and Mining Journal 1916-07-29: Vol 102 Iss 5\",\"date\":\"1916-07-29\"},{\"title\":\"Engineering and Mining Journal 1916-08-05: Vol 102 Iss 6\",\"date\":\"1916-08-05\"},{\"title\":\"Engineering and Mining Journal 1916-09-16: Vol 102 Iss 12\",\"date\":\"1916-09-16\"},{\"title\":\"Engineering and Mining Journal 1921-01-01: Vol 111 Iss 1\",\"date\":\"1921-01-01\"},{\"title\":\"Engineering and Mining Journal 1921-01-15: Vol 111 Iss 3\",\"date\":\"1921-01-15\"},{\"title\":\"Engineering and Mining Journal 1921-09-17: Vol 112 Iss 12\",\"date\":\"1921-09-17\"},{\"title\":\"Engineering and Mining Journal 1919-10-11: Vol 108 Iss 15\",\"date\":\"1919-10-11\"},{\"title\":\"Engineering and Mining Journal-Press 1925-06-27: Vol 119 Iss 26\",\"date\":\"1925-06-27\"},{\"title\":\"Engineering and Mining Journal 1936-09: Vol 137 Iss 9\",\"date\":\"1936-09-01\"},{\"title\":\"Engineering and Mining Journal 1958-09: Vol 159 Iss 9\",\"date\":\"1958-09-01\"},{\"title\":\"Engineering and Mining Journal 1961-02: Vol 162 Iss 2\",\"date\":\"1961-02-01\"},{\"title\":\"Engineering and Mining Journal 1947-09: Vol 148 Iss 9\",\"date\":\"1947-09-01\"},{\"title\":\"American Journal of Mining March-June 1867: Vol 3 Index\",\"date\":\"1867-03-01\"},{\"title\":\"Engineering and Mining Journal 1954-08: Vol 155 Iss 8\",\"date\":\"1954-08-01\"},{\"title\":\"The Engineering and Mining Journal 1872-02-27: Vol 13 Iss 9\",\"date\":\"1872-02-27\"},{\"title\":\"The Engineering and Mining Journal 1872-11-26: Vol 14 Iss 22\",\"date\":\"1872-11-26\"},{\"title\":\"The Engineering and Mining Journal 1874-12-26: Vol 18 Iss 26\",\"date\":\"1874-12-26\"},{\"title\":\"The Engineering and Mining Journal 1875-09-04: Vol 20 Iss 10\",\"date\":\"1875-09-04\"},{\"title\":\"The Engineering and Mining Journal 1875-11-27: Vol 20 Iss 22\",\"date\":\"1875-11-27\"},{\"title\":\"The Engineering and Mining Journal 1876-01-22: Vol 21 Iss 4\",\"date\":\"1876-01-22\"},{\"title\":\"The Engineering and Mining Journal 1880-06-26: Vol 29 Iss 26\",\"date\":\"1880-06-26\"},{\"title\":\"The Engineering and Mining Journal 1884-08-30: Vol 38 Iss 9\",\"date\":\"1884-08-30\"},{\"title\":\"The Engineering and Mining Journal 1887-02-12: Vol 43 Iss 7\",\"date\":\"1887-02-12\"},{\"title\":\"The Engineering and Mining Journal 1887-02-19: Vol 43 Iss 8\",\"date\":\"1887-02-19\"},{\"title\":\"The Engineering and Mining Journal 1887-04-02: Vol 43 Iss 14\",\"date\":\"1887-04-02\"},{\"title\":\"The Engineering and Mining Journal 1887-08-06: Vol 44 Iss 6\",\"date\":\"1887-08-06\"},{\"title\":\"The Engineering and Mining Journal 1887-10-15: Vol 44 Iss 16\",\"date\":\"1887-10-15\"},{\"title\":\"The Engineering and Mining Journal 1882-04-15: Vol 33 Iss 15\",\"date\":\"1882-04-15\"},{\"title\":\"The Engineering and Mining Journal 1882-07-29: Vol 34 Iss 5\",\"date\":\"1882-07-29\"},{\"title\":\"The Engineering and Mining Journal 1889-10-26: Vol 48 Iss 17\",\"date\":\"1889-10-26\"},{\"title\":\"The Engineering and Mining Journal 1897-07-10: Vol 64 Iss 2\",\"date\":\"1897-07-10\"},{\"title\":\"The Engineering and Mining Journal 1898-02-26: Vol 65 Iss 9\",\"date\":\"1898-02-26\"},{\"title\":\"The Engineering and Mining Journal 1898-07-23: Vol 66 Iss 4\",\"date\":\"1898-07-23\"},{\"title\":\"The Engineering and Mining Journal 1898-11-19: Vol 66 Iss 21\",\"date\":\"1898-11-19\"},{\"title\":\"The Engineering and Mining Journal 1899-04-22: Vol 67 Iss 16\",\"date\":\"1899-04-22\"},{\"title\":\"The Engineering and Mining Journal 1901-03-23: Vol 71 Iss 12\",\"date\":\"1901-03-23\"},{\"title\":\"The Engineering and Mining Journal 1901-11-23: Vol 72 Iss 21\",\"date\":\"1901-11-23\"},{\"title\":\"The Engineering and Mining Journal 1909-01-30: Vol 87 Iss 5\",\"date\":\"1909-01-30\"},{\"title\":\"The Engineering and Mining Journal 1910-12-03: Vol 90 Iss 23\",\"date\":\"1910-12-03\"},{\"title\":\"The Engineering and Mining Journal 1911-02-11: Vol 91 Iss 6\",\"date\":\"1911-02-11\"},{\"title\":\"The Engineering and Mining Journal 1909-07-10: Vol 88 Iss 2\",\"date\":\"1909-07-10\"},{\"title\":\"The Engineering and Mining Journal 1909-10-09: Vol 88 Iss 15\",\"date\":\"1909-10-09\"},{\"title\":\"The Engineering and Mining Journal 1914-11-21: Vol 98 Iss 21\",\"date\":\"1914-11-21\"},{\"title\":\"The Engineering and Mining Journal 1915-06-19: Vol 99 Iss 25\",\"date\":\"1915-06-19\"},{\"title\":\"The Engineering and Mining Journal 1915-10-23: Vol 100 Iss 17\",\"date\":\"1915-10-23\"},{\"title\":\"Engineering and Mining Journal 1916-10-14: Vol 102 Iss 16\",\"date\":\"1916-10-14\"},{\"title\":\"Engineering and Mining Journal 1917-02-10: Vol 103 Iss 6\",\"date\":\"1917-02-10\"},{\"title\":\"Engineering and Mining Journal 1917-04-14: Vol 103 Iss 15\",\"date\":\"1917-04-14\"},{\"title\":\"Engineering and Mining Journal 1920-11-06: Vol 110 Iss 19\",\"date\":\"1920-11-06\"},{\"title\":\"Engineering and Mining Journal 1921-03-19: Vol 111 Iss 12\",\"date\":\"1921-03-19\"},{\"title\":\"Engineering and Mining Journal 1921-11-05: Vol 112 Iss 19\",\"date\":\"1921-11-05\"},{\"title\":\"Engineering and Mining Journal 1920-01-03: Vol 109 Iss 1\",\"date\":\"1920-01-03\"},{\"title\":\"Engineering and Mining Journal 1920-04-17: Vol 109 Iss 16\",\"date\":\"1920-04-17\"},{\"title\":\"Engineering and Mining Journal 1920-06-26: Vol 109 Iss 26\",\"date\":\"1920-06-26\"},{\"title\":\"Engineering and Mining Journal-Press 1924: Vol 117 Index\",\"date\":\"1924-01-01\"},{\"title\":\"Engineering and Mining Journal 1927-01-01: Vol 123 Iss 1\",\"date\":\"1927-01-01\"},{\"title\":\"Engineering and Mining Journal 1927-03-19: Vol 123 Iss 12\",\"date\":\"1927-03-19\"},{\"title\":\"Engineering and Mining Journal 1927-07-30: Vol 124 Iss 5\",\"date\":\"1927-07-30\"},{\"title\":\"Engineering and Mining Journal 1932-06: Vol 133 Iss 6\",\"date\":\"1932-06-01\"},{\"title\":\"Engineering and Mining Journal 1932-07: Vol 133 Iss 7\",\"date\":\"1932-07-01\"},{\"title\":\"Engineering and Mining Journal 1936-10: Vol 137 Iss 10\",\"date\":\"1936-10-01\"},{\"title\":\"Engineering and Mining Journal 1940-07: Vol 141 Iss 7\",\"date\":\"1940-07-01\"},{\"title\":\"Engineering and Mining Journal 1944-05: Vol 145 Iss 5\",\"date\":\"1944-05-01\"},{\"title\":\"Engineering and Mining Journal January-December 1932: Vol 133 Index\",\"date\":\"1932-01-01\"},{\"title\":\"Engineering and Mining Journal January-December 1963: Vol 164 Index\",\"date\":\"1963-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1875: Vol 19 Index\",\"date\":\"1875-01-01\"},{\"title\":\"The Engineering and Mining Journal 1872-01-16: Vol 13 Iss 3\",\"date\":\"1872-01-16\"},{\"title\":\"The Engineering and Mining Journal 1901-05-18: Vol 71 Supplement\",\"date\":\"1901-05-18\"},{\"title\":\"The Engineering and Mining Journal 1904-08-25: Vol 78 Iss 8\",\"date\":\"1904-08-25\"},{\"title\":\"The Engineering and Mining Journal 1903-06-13: Vol 75 Iss 24\",\"date\":\"1903-06-13\"},{\"title\":\"The Engineering and Mining Journal 1913-07-19: Vol 96 Iss 3\",\"date\":\"1913-07-19\"},{\"title\":\"Engineering and Mining Journal-Press 1922-12-23: Vol 114 Iss 26\",\"date\":\"1922-12-23\"},{\"title\":\"Engineering and Mining Journal 1928-11-24: Vol 126 Iss 21\",\"date\":\"1928-11-24\"},{\"title\":\"Engineering and Mining Journal November 8 and 15, 1919: Vol 108 Iss 19\",\"date\":\"1919-11-08\"},{\"title\":\"The Engineering and Mining Journal 1874-09-19: Vol 18 Iss 12\",\"date\":\"1874-09-19\"},{\"title\":\"The Engineering and Mining Journal 1879-08-09: Vol 28 Iss 6\",\"date\":\"1879-08-09\"},{\"title\":\"The Engineering and Mining Journal 1890-02-22: Vol 49 Iss 8\",\"date\":\"1890-02-22\"},{\"title\":\"The Engineering and Mining Journal 1891-01-24: Vol 51 Iss 4\",\"date\":\"1891-01-24\"},{\"title\":\"The Engineering and Mining Journal 1891-05-23: Vol 51 Iss 21\",\"date\":\"1891-05-23\"},{\"title\":\"The Engineering and Mining Journal 1896-01-25: Vol 61 Iss 4\",\"date\":\"1896-01-25\"},{\"title\":\"The Engineering and Mining Journal 1901-08-24: Vol 72 Iss 8\",\"date\":\"1901-08-24\"},{\"title\":\"The Engineering and Mining Journal 1901-10-19: Vol 72 Supplement\",\"date\":\"1901-10-19\"},{\"title\":\"The Engineering and Mining Journal 1906-09-01: Vol 82 Iss 9\",\"date\":\"1906-09-01\"},{\"title\":\"The Engineering and Mining Journal 1916-04-15: Vol 101 Iss 16\",\"date\":\"1916-04-15\"},{\"title\":\"Engineering and Mining Journal 1919-03-29: Vol 107 Iss 13\",\"date\":\"1919-03-29\"},{\"title\":\"American Journal of Mining 1866-11-24: Vol 2 Iss 9\",\"date\":\"1866-11-24\"},{\"title\":\"American Journal of Mining 1867-07-20: Vol 4 Iss 3\",\"date\":\"1867-07-20\"},{\"title\":\"American Journal of Mining 1868-06-20: Vol 5 Iss 25\",\"date\":\"1868-06-20\"},{\"title\":\"American Journal of Mining 1868-11-14: Vol 6 Iss 20\",\"date\":\"1868-11-14\"},{\"title\":\"The Engineering and Mining Journal 1869-08-03: Vol 8 Iss 5\",\"date\":\"1869-08-03\"},{\"title\":\"The Engineering and Mining Journal 1870-01-11: Vol 9 Iss 2\",\"date\":\"1870-01-11\"},{\"title\":\"The Engineering and Mining Journal 1872-04-30: Vol 13 Iss 18\",\"date\":\"1872-04-30\"},{\"title\":\"The Engineering and Mining Journal 1872-07-16: Vol 14 Iss 3\",\"date\":\"1872-07-16\"},{\"title\":\"The Engineering and Mining Journal 1872-07-23: Vol 14 Iss 4\",\"date\":\"1872-07-23\"},{\"title\":\"The Engineering and Mining Journal 1880-01-10: Vol 29 Iss 2\",\"date\":\"1880-01-10\"},{\"title\":\"The Engineering and Mining Journal 1873-06-17: Vol 15 Iss 24\",\"date\":\"1873-06-17\"},{\"title\":\"The Engineering and Mining Journal 1873-10-07: Vol 16 Iss 15\",\"date\":\"1873-10-07\"},{\"title\":\"The Engineering and Mining Journal 1873-12-30: Vol 16 Iss 27\",\"date\":\"1873-12-30\"},{\"title\":\"The Engineering and Mining Journal 1884-04-12: Vol 37 Iss 15\",\"date\":\"1884-04-12\"},{\"title\":\"The Engineering and Mining Journal 1882-01-28: Vol 33 Iss 4\",\"date\":\"1882-01-28\"},{\"title\":\"The Engineering and Mining Journal 1882-02-25: Vol 33 Iss 8\",\"date\":\"1882-02-25\"},{\"title\":\"The Engineering and Mining Journal 1892-09-03: Vol 54 Iss 10\",\"date\":\"1892-09-03\"},{\"title\":\"The Engineering and Mining Journal 1892-09-10: Vol 54 Iss 11\",\"date\":\"1892-09-10\"},{\"title\":\"The Engineering and Mining Journal 1892-12-10: Vol 54 Iss 24\",\"date\":\"1892-12-10\"},{\"title\":\"The Engineering and Mining Journal 1894-11-24: Vol 58 Iss 21\",\"date\":\"1894-11-24\"},{\"title\":\"The Engineering and Mining Journal 1894-12-22: Vol 58 Iss 25\",\"date\":\"1894-12-22\"},{\"title\":\"The Engineering and Mining Journal 1894-12-29: Vol 58 Iss 26\",\"date\":\"1894-12-29\"},{\"title\":\"The Engineering and Mining Journal 1895-03-16: Vol 59 Iss 11\",\"date\":\"1895-03-16\"},{\"title\":\"The Engineering and Mining Journal 1897-05-29: Vol 63 Iss 22\",\"date\":\"1897-05-29\"},{\"title\":\"The Engineering and Mining Journal 1897-10-16: Vol 64 Iss 16\",\"date\":\"1897-10-16\"},{\"title\":\"The Engineering and Mining Journal 1895-11-16: Vol 60 Iss 20\",\"date\":\"1895-11-16\"},{\"title\":\"The Engineering and Mining Journal 1896-11-21: Vol 62 Iss 21\",\"date\":\"1896-11-21\"},{\"title\":\"The Engineering and Mining Journal 1901-12-28: Vol 72 Iss 26\",\"date\":\"1901-12-28\"},{\"title\":\"The Engineering and Mining Journal 1903-07-11: Vol 76 Iss 2\",\"date\":\"1903-07-11\"},{\"title\":\"The Engineering and Mining Journal 1904-06-09: Vol 77 Iss 23\",\"date\":\"1904-06-09\"},{\"title\":\"The Engineering and Mining Journal 1906-12-29: Vol 82 Iss 26\",\"date\":\"1906-12-29\"},{\"title\":\"The Engineering and Mining Journal 1907-05-04: Vol 83 Iss 18\",\"date\":\"1907-05-04\"},{\"title\":\"The Engineering and Mining Journal 1908-01-25: Vol 85 Iss 4\",\"date\":\"1908-01-25\"},{\"title\":\"The Engineering and Mining Journal 1908-05-23: Vol 85 Iss 21\",\"date\":\"1908-05-23\"},{\"title\":\"The Engineering and Mining Journal 1911-01-07: Vol 91 Iss 1\",\"date\":\"1911-01-07\"},{\"title\":\"The Engineering and Mining Journal 1911-04-15: Vol 91 Iss 15\",\"date\":\"1911-04-15\"},{\"title\":\"The Engineering and Mining Journal 1911-05-06: Vol 91 Iss 18\",\"date\":\"1911-05-06\"},{\"title\":\"The Engineering and Mining Journal 1915-05-29: Vol 99 Iss 22\",\"date\":\"1915-05-29\"},{\"title\":\"The Engineering and Mining Journal 1912-01-20: Vol 93 Iss 3\",\"date\":\"1912-01-20\"},{\"title\":\"The Engineering and Mining Journal 1912-12-14: Vol 94 Iss 24\",\"date\":\"1912-12-14\"},{\"title\":\"The Engineering and Mining Journal 1912-12-28: Vol 94 Iss 26\",\"date\":\"1912-12-28\"},{\"title\":\"The Engineering and Mining Journal 1913-01-04: Vol 95 Iss 1\",\"date\":\"1913-01-04\"},{\"title\":\"Engineering and Mining Journal 1918-08-17: Vol 106 Iss 7\",\"date\":\"1918-08-17\"},{\"title\":\"Engineering and Mining Journal 1918-10-05: Vol 106 Iss 14\",\"date\":\"1918-10-05\"},{\"title\":\"Engineering and Mining Journal 1919-06-07: Vol 107 Iss 23\",\"date\":\"1919-06-07\"},{\"title\":\"Engineering and Mining Journal 1919-10-04: Vol 108 Iss 14\",\"date\":\"1919-10-04\"},{\"title\":\"Engineering and Mining Journal 1920-09-11: Vol 110 Iss 11\",\"date\":\"1920-09-11\"},{\"title\":\"Engineering and Mining Journal-Press 1924-06-14: Vol 117 Iss 24\",\"date\":\"1924-06-14\"},{\"title\":\"Engineering and Mining Journal-Press 1925-05-09: Vol 119 Iss 19\",\"date\":\"1925-05-09\"},{\"title\":\"Engineering and Mining Journal-Press 1925-11-28: Vol 120 Iss 22\",\"date\":\"1925-11-28\"},{\"title\":\"Engineering and Mining Journal 1926-09-25: Vol 122 Iss 13\",\"date\":\"1926-09-25\"},{\"title\":\"Engineering and Mining Journal 1959-07: Vol 160 Iss 7\",\"date\":\"1959-07-01\"},{\"title\":\"Engineering and Mining Journal 1961-12: Vol 162 Iss 12\",\"date\":\"1961-12-01\"},{\"title\":\"The Engineering and Mining Journal 1876-05-20: Vol 21 Iss 21\",\"date\":\"1876-05-20\"},{\"title\":\"The Engineering and Mining Journal 1876-09-23: Vol 22 Iss 13\",\"date\":\"1876-09-23\"},{\"title\":\"The Engineering and Mining Journal 1876-11-04: Vol 22 Iss 19\",\"date\":\"1876-11-04\"},{\"title\":\"The Engineering and Mining Journal 1877-03-03: Vol 23 Iss 9\",\"date\":\"1877-03-03\"},{\"title\":\"The Engineering and Mining Journal 1874-10-03: Vol 18 Iss 14\",\"date\":\"1874-10-03\"},{\"title\":\"The Engineering and Mining Journal 1876-01-15: Vol 21 Iss 3\",\"date\":\"1876-01-15\"},{\"title\":\"The Engineering and Mining Journal 1880-08-14: Vol 30 Iss 7\",\"date\":\"1880-08-14\"},{\"title\":\"The Engineering and Mining Journal 1880-11-06: Vol 30 Iss 19\",\"date\":\"1880-11-06\"},{\"title\":\"The Engineering and Mining Journal 1880-12-11: Vol 30 Iss 24\",\"date\":\"1880-12-11\"},{\"title\":\"The Engineering and Mining Journal 1887-01-15: Vol 43 Iss 3\",\"date\":\"1887-01-15\"},{\"title\":\"The Engineering and Mining Journal 1883-07-14: Vol 36 Iss 2\",\"date\":\"1883-07-14\"},{\"title\":\"The Engineering and Mining Journal 1885-04-04: Vol 39 Iss 14\",\"date\":\"1885-04-04\"},{\"title\":\"The Engineering and Mining Journal 1886-05-29: Vol 41 Iss 22\",\"date\":\"1886-05-29\"},{\"title\":\"The Engineering and Mining Journal 1886-06-26: Vol 41 Iss 26\",\"date\":\"1886-06-26\"},{\"title\":\"The Engineering and Mining Journal 1886-07-17: Vol 42 Iss 3\",\"date\":\"1886-07-17\"},{\"title\":\"The Engineering and Mining Journal 1889-08-17: Vol 48 Iss 7\",\"date\":\"1889-08-17\"},{\"title\":\"The Engineering and Mining Journal 1890-03-15: Vol 49 Iss 11\",\"date\":\"1890-03-15\"},{\"title\":\"The Engineering and Mining Journal 1888-03-17: Vol 45 Iss 11\",\"date\":\"1888-03-17\"},{\"title\":\"The Engineering and Mining Journal 1889-01-26: Vol 47 Iss 4\",\"date\":\"1889-01-26\"},{\"title\":\"The Engineering and Mining Journal 1890-11-22: Vol 50 Iss 21\",\"date\":\"1890-11-22\"},{\"title\":\"The Engineering and Mining Journal 1893-02-18: Vol 55 Iss 7\",\"date\":\"1893-02-18\"},{\"title\":\"The Engineering and Mining Journal 1902-07-05: Vol 74 Iss 1\",\"date\":\"1902-07-05\"},{\"title\":\"The Engineering and Mining Journal 1904-08-11: Vol 78 Iss 6\",\"date\":\"1904-08-11\"},{\"title\":\"The Engineering and Mining Journal 1905-05-18: Vol 79 Iss 20\",\"date\":\"1905-05-18\"},{\"title\":\"The Engineering and Mining Journal 1914-04-04: Vol 97 Iss 14\",\"date\":\"1914-04-04\"},{\"title\":\"The Engineering and Mining Journal 1910-01-29: Vol 89 Iss 5\",\"date\":\"1910-01-29\"},{\"title\":\"The Engineering and Mining Journal 1910-05-21: Vol 89 Iss 21\",\"date\":\"1910-05-21\"},{\"title\":\"The Engineering and Mining Journal 1910-08-20: Vol 90 Iss 8\",\"date\":\"1910-08-20\"},{\"title\":\"Engineering and Mining Journal 1916-10-21: Vol 102 Iss 17\",\"date\":\"1916-10-21\"},{\"title\":\"Engineering and Mining Journal 1921-04-09: Vol 111 Iss 15\",\"date\":\"1921-04-09\"},{\"title\":\"Engineering and Mining Journal 1921-07-23: Vol 112 Iss 4\",\"date\":\"1921-07-23\"},{\"title\":\"Engineering and Mining Journal 1921-10-29: Vol 112 Iss 18\",\"date\":\"1921-10-29\"},{\"title\":\"Engineering and Mining Journal-Press 1923-11-17: Vol 116 Iss 20\",\"date\":\"1923-11-17\"},{\"title\":\"Engineering and Mining Journal-Press 1924-05-03: Vol 117 Iss 18\",\"date\":\"1924-05-03\"},{\"title\":\"Engineering and Mining Journal 1921-11-26: Vol 112 Iss 22\",\"date\":\"1921-11-26\"},{\"title\":\"Engineering and Mining Journal-Press 1922-04-29: Vol 113 Iss 17\",\"date\":\"1922-04-29\"},{\"title\":\"Engineering and Mining Journal-Press 1923-02-10: Vol 115 Iss 6\",\"date\":\"1923-02-10\"},{\"title\":\"Engineering and Mining Journal 1927-12-10: Vol 124 Iss 24\",\"date\":\"1927-12-10\"},{\"title\":\"Engineering and Mining Journal 1928-03-24: Vol 125 Iss 12\",\"date\":\"1928-03-24\"},{\"title\":\"Engineering and Mining Journal 1928-05-05: Vol 125 Iss 18\",\"date\":\"1928-05-05\"},{\"title\":\"Engineering and Mining Journal 1928-09-01: Vol 126 Iss 9\",\"date\":\"1928-09-01\"},{\"title\":\"Engineering and Mining Journal 1927-09-17: Vol 124 Iss 12\",\"date\":\"1927-09-17\"},{\"title\":\"Engineering and Mining Journal 1951-03: Vol 152 Iss 3\",\"date\":\"1951-03-01\"},{\"title\":\"Engineering and Mining Journal 1952-08: Vol 153 Iss 8\",\"date\":\"1952-08-01\"},{\"title\":\"Engineering and Mining Journal 1953-07: Vol 154 Iss 7\",\"date\":\"1953-07-01\"},{\"title\":\"Engineering and Mining Journal 1939-04: Vol 140 Iss 4\",\"date\":\"1939-04-01\"},{\"title\":\"Engineering and Mining Journal 1942-02: Vol 143 Iss 2\",\"date\":\"1942-02-01\"},{\"title\":\"Engineering and Mining Journal 1943-08: Vol 144 Iss 8\",\"date\":\"1943-08-01\"},{\"title\":\"The Engineering and Mining Journal January - June 1903: Vol 75 Index\",\"date\":\"1903-01-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1878: Vol 26 Index\",\"date\":\"1878-07-01\"},{\"title\":\"The Engineering and Mining Journal 1872-03-19: Vol 13 Iss 12\",\"date\":\"1872-03-19\"},{\"title\":\"The Engineering and Mining Journal 1873-11-04: Vol 16 Iss 19\",\"date\":\"1873-11-04\"},{\"title\":\"The Engineering and Mining Journal 1875-02-06: Vol 19 Iss 6\",\"date\":\"1875-02-06\"},{\"title\":\"The Engineering and Mining Journal 1875-10-02: Vol 20 Iss 14\",\"date\":\"1875-10-02\"},{\"title\":\"The Engineering and Mining Journal 1906-02-03: Vol 81 Iss 5\",\"date\":\"1906-02-03\"},{\"title\":\"The Engineering and Mining Journal 1912-09-14: Vol 94 Iss 11\",\"date\":\"1912-09-14\"},{\"title\":\"The Engineering and Mining Journal 1912-10-12: Vol 94 Iss 15\",\"date\":\"1912-10-12\"},{\"title\":\"The Engineering and Mining Journal 1916-03-04: Vol 101 Iss 10\",\"date\":\"1916-03-04\"},{\"title\":\"Engineering and Mining Journal 1918-03-16: Vol 105 Iss 11\",\"date\":\"1918-03-16\"},{\"title\":\"Engineering and Mining Journal 1919-10-18: Vol 108 Iss 16\",\"date\":\"1919-10-18\"},{\"title\":\"Engineering and Mining Journal-Press 1923-09-08: Vol 116 Iss 10\",\"date\":\"1923-09-08\"},{\"title\":\"Engineering and Mining Journal 1927-06-18: Vol 123 Iss 25\",\"date\":\"1927-06-18\"},{\"title\":\"Engineering and Mining Journal 1927-09-03: Vol 124 Iss 10\",\"date\":\"1927-09-03\"},{\"title\":\"Engineering and Mining Journal 1927-12-24: Vol 124 Iss 26\",\"date\":\"1927-12-24\"},{\"title\":\"Engineering and Mining Journal 1928-02-04: Vol 125 Iss 5\",\"date\":\"1928-02-04\"},{\"title\":\"Engineering and Mining Journal 1943-03: Vol 144 Iss 3\",\"date\":\"1943-03-01\"},{\"title\":\"Engineering and Mining Journal January-December 1933: Vol 134 Index\",\"date\":\"1933-01-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1875: Vol 20 Index\",\"date\":\"1875-07-01\"},{\"title\":\"American Journal of Mining 1867-07-13: Vol 4 Iss 2\",\"date\":\"1867-07-13\"},{\"title\":\"American Journal of Mining 1867-09-07: Vol 4 Iss 10\",\"date\":\"1867-09-07\"},{\"title\":\"American Journal of Mining 1867-11-30: Vol 4 Iss 22\",\"date\":\"1867-11-30\"},{\"title\":\"The Engineering and Mining Journal 1876-12-16: Vol 22 Iss 25\",\"date\":\"1876-12-16\"},{\"title\":\"The Engineering and Mining Journal 1877-06-09: Vol 23 Iss 23\",\"date\":\"1877-06-09\"},{\"title\":\"The Engineering and Mining Journal 1877-09-15: Vol 24 Iss 11\",\"date\":\"1877-09-15\"},{\"title\":\"The Engineering and Mining Journal 1885-05-30: Vol 39 Iss 22\",\"date\":\"1885-05-30\"},{\"title\":\"The Engineering and Mining Journal 1887-04-30: Vol 43 Iss 18\",\"date\":\"1887-04-30\"},{\"title\":\"The Engineering and Mining Journal 1895-03-02: Vol 59 Iss 9\",\"date\":\"1895-03-02\"},{\"title\":\"The Engineering and Mining Journal 1901-08-24: Vol 72 Supplement\",\"date\":\"1901-08-24\"},{\"title\":\"The Engineering and Mining Journal 1901-03-02: Vol 71 Iss 9\",\"date\":\"1901-03-02\"},{\"title\":\"The Engineering and Mining Journal 1910-09-17: Vol 90 Iss 12\",\"date\":\"1910-09-17\"},{\"title\":\"The Engineering and Mining Journal 1914-02-07: Vol 97 Iss 6\",\"date\":\"1914-02-07\"},{\"title\":\"Engineering and Mining Journal-Press 1923-12-01: Vol 116 Iss 22\",\"date\":\"1923-12-01\"},{\"title\":\"Engineering and Mining Journal-Press 1925-12-26: Vol 120 Iss 26\",\"date\":\"1925-12-26\"},{\"title\":\"Engineering and Mining Journal 1926-08-14: Vol 122 Iss 7\",\"date\":\"1926-08-14\"},{\"title\":\"Engineering and Mining Journal 1931-12-14: Vol 132 Iss 11\",\"date\":\"1931-12-14\"},{\"title\":\"The Engineering and Mining Journal 1912-10-26: Vol 94 Iss 17\",\"date\":\"1912-10-26\"},{\"title\":\"The Engineering and Mining Journal 1907-08-10: Vol 84 Iss 6\",\"date\":\"1907-08-10\"},{\"title\":\"The Engineering and Mining Journal 1904-03-10: Vol 77 Iss 10\",\"date\":\"1904-03-10\"},{\"title\":\"The Engineering and Mining Journal 1913-11-08: Vol 96 Iss 19\",\"date\":\"1913-11-08\"},{\"title\":\"The Engineering and Mining Journal 1909-05-01: Vol 87 Iss 18\",\"date\":\"1909-05-01\"},{\"title\":\"The Engineering and Mining Journal 1909-06-12: Vol 87 Iss 24\",\"date\":\"1909-06-12\"},{\"title\":\"The Engineering and Mining Journal 1916-04-08: Vol 101 Iss 15\",\"date\":\"1916-04-08\"},{\"title\":\"Engineering and Mining Journal 1920-06-19: Vol 109 Iss 25\",\"date\":\"1920-06-19\"},{\"title\":\"Engineering and Mining Journal-Press 1923-11-10: Vol 116 Iss 19\",\"date\":\"1923-11-10\"},{\"title\":\"Engineering and Mining Journal-Press 1922-12-09: Vol 114 Iss 24\",\"date\":\"1922-12-09\"},{\"title\":\"Engineering and Mining Journal 1929-09-14: Vol 128 Iss 11\",\"date\":\"1929-09-14\"},{\"title\":\"Engineering and Mining Journal 1928-09-15: Vol 126 Iss 11\",\"date\":\"1928-09-15\"},{\"title\":\"The Engineering and Mining Journal January - June 1896: Vol 61 Index\",\"date\":\"1896-01-01\"},{\"title\":\"Engineering and Mining Journal January-December 1965: Vol 166 Index\",\"date\":\"1965-01-01\"},{\"title\":\"American Journal of Mining 1869-02-27: Vol 7 Iss 9\",\"date\":\"1869-02-27\"},{\"title\":\"The Engineering and Mining Journal 1872-02-06: Vol 13 Iss 6\",\"date\":\"1872-02-06\"},{\"title\":\"The Engineering and Mining Journal 1875-07-17: Vol 20 Iss 3\",\"date\":\"1875-07-17\"},{\"title\":\"The Engineering and Mining Journal 1876-06-10: Vol 21 Iss 24\",\"date\":\"1876-06-10\"},{\"title\":\"The Engineering and Mining Journal 1876-08-12: Vol 22 Iss 7\",\"date\":\"1876-08-12\"},{\"title\":\"The Engineering and Mining Journal 1895-02-16: Vol 59 Iss 7\",\"date\":\"1895-02-16\"},{\"title\":\"The Engineering and Mining Journal 1897-01-30: Vol 63 Iss 5\",\"date\":\"1897-01-30\"},{\"title\":\"The Engineering and Mining Journal 1894-05-05: Vol 57 Iss 18\",\"date\":\"1894-05-05\"},{\"title\":\"The Engineering and Mining Journal 1894-05-12: Vol 57 Iss 19\",\"date\":\"1894-05-12\"},{\"title\":\"The Engineering and Mining Journal 1897-08-14: Vol 64 Iss 7\",\"date\":\"1897-08-14\"},{\"title\":\"The Engineering and Mining Journal 1908-07-25: Vol 86 Iss 4\",\"date\":\"1908-07-25\"},{\"title\":\"The Engineering and Mining Journal 1912-03-09: Vol 93 Iss 10\",\"date\":\"1912-03-09\"},{\"title\":\"The Engineering and Mining Journal 1915-07-03: Vol 100 Iss 1\",\"date\":\"1915-07-03\"},{\"title\":\"Engineering and Mining Journal 1920-05-15: Vol 109 Iss 20\",\"date\":\"1920-05-15\"},{\"title\":\"Engineering and Mining Journal-Press 1926-01-09: Vol 121 Iss 2\",\"date\":\"1926-01-09\"},{\"title\":\"The Engineering and Mining Journal 1871-05-02: Vol 11 Iss 18\",\"date\":\"1871-05-02\"},{\"title\":\"The Engineering and Mining Journal 1872-05-14: Vol 13 Iss 20\",\"date\":\"1872-05-14\"},{\"title\":\"The Engineering and Mining Journal 1879-09-06: Vol 28 Iss 10\",\"date\":\"1879-09-06\"},{\"title\":\"The Engineering and Mining Journal 1879-09-27: Vol 28 Iss 13\",\"date\":\"1879-09-27\"},{\"title\":\"The Engineering and Mining Journal 1879-11-08: Vol 28 Iss 19\",\"date\":\"1879-11-08\"},{\"title\":\"The Engineering and Mining Journal 1873-07-08: Vol 16 Iss 2\",\"date\":\"1873-07-08\"},{\"title\":\"The Engineering and Mining Journal 1874-01-10: Vol 17 Iss 2\",\"date\":\"1874-01-10\"},{\"title\":\"The Engineering and Mining Journal 1878-03-30: Vol 25 Iss 13\",\"date\":\"1878-03-30\"},{\"title\":\"The Engineering and Mining Journal 1884-02-02: Vol 37 Iss 5\",\"date\":\"1884-02-02\"},{\"title\":\"The Engineering and Mining Journal 1884-12-20: Vol 38 Iss 25\",\"date\":\"1884-12-20\"},{\"title\":\"The Engineering and Mining Journal 1885-01-03: Vol 39 Iss 1\",\"date\":\"1885-01-03\"},{\"title\":\"The Engineering and Mining Journal 1883-12-15: Vol 36 Iss 24\",\"date\":\"1883-12-15\"},{\"title\":\"The Engineering and Mining Journal 1885-05-02: Vol 39 Iss 18\",\"date\":\"1885-05-02\"},{\"title\":\"The Engineering and Mining Journal 1886-06-12: Vol 41 Iss 24\",\"date\":\"1886-06-12\"},{\"title\":\"The Engineering and Mining Journal 1881-08-20: Vol 32 Iss 8\",\"date\":\"1881-08-20\"},{\"title\":\"The Engineering and Mining Journal 1891-04-04: Vol 51 Iss 14\",\"date\":\"1891-04-04\"},{\"title\":\"The Engineering and Mining Journal 1893-04-22: Vol 55 Iss 16\",\"date\":\"1893-04-22\"},{\"title\":\"The Engineering and Mining Journal 1893-10-14: Vol 56 Iss 16\",\"date\":\"1893-10-14\"},{\"title\":\"The Engineering and Mining Journal 1899-12-09: Vol 68 Iss 24\",\"date\":\"1899-12-09\"},{\"title\":\"The Engineering and Mining Journal 1899-12-16: Vol 68 Iss 25\",\"date\":\"1899-12-16\"},{\"title\":\"The Engineering and Mining Journal 1898-05-14: Vol 65 Iss 20\",\"date\":\"1898-05-14\"},{\"title\":\"The Engineering and Mining Journal 1898-06-04: Vol 65 Iss 23\",\"date\":\"1898-06-04\"},{\"title\":\"The Engineering and Mining Journal 1904-07-21: Vol 78 Iss 3\",\"date\":\"1904-07-21\"},{\"title\":\"The Engineering and Mining Journal 1904-10-27: Vol 78 Iss 17\",\"date\":\"1904-10-27\"},{\"title\":\"The Engineering and Mining Journal 1904-11-17: Vol 78 Iss 20\",\"date\":\"1904-11-17\"},{\"title\":\"The Engineering and Mining Journal 1905-02-02: Vol 79 Iss 5\",\"date\":\"1905-02-02\"},{\"title\":\"The Engineering and Mining Journal 1905-08-12: Vol 80 Iss 6\",\"date\":\"1905-08-12\"},{\"title\":\"The Engineering and Mining Journal 1905-08-26: Vol 80 Iss 8\",\"date\":\"1905-08-26\"},{\"title\":\"The Engineering and Mining Journal 1911-09-02: Vol 92 Iss 10\",\"date\":\"1911-09-02\"},{\"title\":\"The Engineering and Mining Journal 1911-09-30: Vol 92 Iss 14\",\"date\":\"1911-09-30\"},{\"title\":\"The Engineering and Mining Journal 1911-11-18: Vol 92 Iss 21\",\"date\":\"1911-11-18\"},{\"title\":\"The Engineering and Mining Journal 1914-09-19: Vol 98 Iss 12\",\"date\":\"1914-09-19\"},{\"title\":\"The Engineering and Mining Journal 1914-12-05: Vol 98 Iss 23\",\"date\":\"1914-12-05\"},{\"title\":\"The Engineering and Mining Journal 1915-04-03: Vol 99 Iss 14\",\"date\":\"1915-04-03\"},{\"title\":\"Engineering and Mining Journal 1921-04-23: Vol 111 Iss 17\",\"date\":\"1921-04-23\"},{\"title\":\"Engineering and Mining Journal 1921-11-19: Vol 112 Iss 21\",\"date\":\"1921-11-19\"},{\"title\":\"Engineering and Mining Journal 1929-02-09: Vol 127 Iss 6\",\"date\":\"1929-02-09\"},{\"title\":\"Engineering and Mining Journal 1931-08-24: Vol 132 Iss 4\",\"date\":\"1931-08-24\"},{\"title\":\"Engineering and Mining Journal 1952: Vol 153 Index\",\"date\":\"1952-01-01\"},{\"title\":\"Engineering and Mining Journal 1958-12: Vol 159 Iss 12\",\"date\":\"1958-12-01\"},{\"title\":\"Engineering and Mining Journal 1960-08: Vol 161 Iss 8\",\"date\":\"1960-08-01\"},{\"title\":\"Engineering and Mining Journal 1961-10: Vol 162 Iss 10\",\"date\":\"1961-10-01\"},{\"title\":\"Engineering and Mining Journal 1944-10: Vol 145 Iss 10\",\"date\":\"1944-10-01\"},{\"title\":\"Engineering and Mining Journal 1945-01: Vol 146 Iss 1\",\"date\":\"1945-01-01\"},{\"title\":\"Engineering and Mining Journal 1946-07: Vol 147 Iss 7\",\"date\":\"1946-07-01\"},{\"title\":\"Engineering and Mining Journal 1947-06: Vol 148 Iss 6\",\"date\":\"1947-06-01\"},{\"title\":\"Engineering and Mining Journal July 1-December 31, 1916: Vol 102 Index\",\"date\":\"1916-07-01\"},{\"title\":\"Engineering and Mining Journal 1991: Vol 192 Index\",\"date\":\"1991-01-01\"},{\"title\":\"Engineering and Mining Journal January-December 1948: Vol 149 Index\",\"date\":\"1948-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1880: Vol 29 Index\",\"date\":\"1880-01-01\"},{\"title\":\"Engineering and Mining Journal 1955-08: Vol 156 Iss 8\",\"date\":\"1955-08-01\"},{\"title\":\"Engineering and Mining Journal 1955-09: Vol 156 Iss 9\",\"date\":\"1955-09-01\"},{\"title\":\"Engineering and Mining Journal 1955: Vol 156 Index\",\"date\":\"1955-01-01\"},{\"title\":\"American Journal of Mining 1866-07-28: Vol 1 Iss 18\",\"date\":\"1866-07-28\"},{\"title\":\"American Journal of Mining 1867-10-12: Vol 4 Iss 15\",\"date\":\"1867-10-12\"},{\"title\":\"American Journal of Mining 1869-06-19: Vol 7 Iss 25\",\"date\":\"1869-06-19\"},{\"title\":\"The Engineering and Mining Journal 1871-10-10: Vol 12 Iss 15\",\"date\":\"1871-10-10\"},{\"title\":\"The Engineering and Mining Journal 1875-04-17: Vol 19 Iss 16\",\"date\":\"1875-04-17\"},{\"title\":\"The Engineering and Mining Journal 1876-01-01: Vol 21 Iss 1\",\"date\":\"1876-01-01\"},{\"title\":\"The Engineering and Mining Journal 1873-06-24: Vol 15 Iss 25\",\"date\":\"1873-06-24\"},{\"title\":\"The Engineering and Mining Journal 1878-03-02: Vol 25 Iss 9\",\"date\":\"1878-03-02\"},{\"title\":\"The Engineering and Mining Journal 1884-04-26: Vol 37 Iss 17\",\"date\":\"1884-04-26\"},{\"title\":\"The Engineering and Mining Journal 1884-05-24: Vol 37 Iss 21\",\"date\":\"1884-05-24\"},{\"title\":\"The Engineering and Mining Journal 1884-11-08: Vol 38 Iss 19\",\"date\":\"1884-11-08\"},{\"title\":\"The Engineering and Mining Journal 1886-08-21: Vol 42 Iss 8\",\"date\":\"1886-08-21\"},{\"title\":\"The Engineering and Mining Journal 1886-11-06: Vol 42 Iss 19\",\"date\":\"1886-11-06\"},{\"title\":\"The Engineering and Mining Journal 1887-01-01: Vol 43 Iss 1\",\"date\":\"1887-01-01\"},{\"title\":\"The Engineering and Mining Journal 1883-04-07: Vol 35 Iss 14\",\"date\":\"1883-04-07\"},{\"title\":\"The Engineering and Mining Journal 1883-06-02: Vol 35 Iss 22\",\"date\":\"1883-06-02\"},{\"title\":\"The Engineering and Mining Journal 1885-07-11: Vol 40 Iss 2\",\"date\":\"1885-07-11\"},{\"title\":\"The Engineering and Mining Journal 1885-07-18: Vol 40 Iss 3\",\"date\":\"1885-07-18\"},{\"title\":\"The Engineering and Mining Journal 1885-08-22: Vol 40 Iss 8\",\"date\":\"1885-08-22\"},{\"title\":\"The Engineering and Mining Journal 1886-01-09: Vol 41 Iss 2\",\"date\":\"1886-01-09\"},{\"title\":\"The Engineering and Mining Journal 1886-02-13: Vol 41 Iss 7\",\"date\":\"1886-02-13\"},{\"title\":\"The Engineering and Mining Journal 1882-03-18: Vol 33 Iss 11\",\"date\":\"1882-03-18\"},{\"title\":\"The Engineering and Mining Journal 1882-09-02: Vol 34 Iss 10\",\"date\":\"1882-09-02\"},{\"title\":\"The Engineering and Mining Journal 1890-03-08: Vol 49 Iss 10\",\"date\":\"1890-03-08\"},{\"title\":\"The Engineering and Mining Journal 1888-05-19: Vol 45 Iss 20\",\"date\":\"1888-05-19\"},{\"title\":\"The Engineering and Mining Journal 1888-06-16: Vol 45 Iss 24\",\"date\":\"1888-06-16\"},{\"title\":\"The Engineering and Mining Journal 1894-12-15: Vol 58 Iss 24\",\"date\":\"1894-12-15\"},{\"title\":\"The Engineering and Mining Journal 1895-08-24: Vol 60 Iss 8\",\"date\":\"1895-08-24\"},{\"title\":\"The Engineering and Mining Journal 1890-08-23: Vol 50 Iss 8\",\"date\":\"1890-08-23\"},{\"title\":\"The Engineering and Mining Journal 1891-03-07: Vol 51 Iss 10\",\"date\":\"1891-03-07\"},{\"title\":\"The Engineering and Mining Journal 1891-08-29: Vol 52 Iss 9\",\"date\":\"1891-08-29\"},{\"title\":\"The Engineering and Mining Journal 1898-02-05: Vol 65 Iss 6\",\"date\":\"1898-02-05\"},{\"title\":\"The Engineering and Mining Journal 1895-11-09: Vol 60 Iss 19\",\"date\":\"1895-11-09\"},{\"title\":\"The Engineering and Mining Journal 1896-03-14: Vol 61 Iss 11\",\"date\":\"1896-03-14\"},{\"title\":\"The Engineering and Mining Journal 1902-09-20: Vol 74 Iss 12\",\"date\":\"1902-09-20\"},{\"title\":\"The Engineering and Mining Journal 1902-11-01: Vol 74 Iss 18\",\"date\":\"1902-11-01\"},{\"title\":\"The Engineering and Mining Journal 1902-11-29: Vol 74 Iss 22\",\"date\":\"1902-11-29\"},{\"title\":\"The Engineering and Mining Journal 1899-10-14: Vol 68 Iss 16\",\"date\":\"1899-10-14\"},{\"title\":\"The Engineering and Mining Journal 1900-02-24: Vol 69 Iss 8\",\"date\":\"1900-02-24\"},{\"title\":\"The Engineering and Mining Journal 1900-06-02: Vol 69 Iss 22\",\"date\":\"1900-06-02\"},{\"title\":\"The Engineering and Mining Journal 1898-07-09: Vol 66 Iss 2\",\"date\":\"1898-07-09\"},{\"title\":\"The Engineering and Mining Journal 1898-08-27: Vol 66 Iss 9\",\"date\":\"1898-08-27\"},{\"title\":\"The Engineering and Mining Journal 1899-04-08: Vol 67 Iss 14\",\"date\":\"1899-04-08\"},{\"title\":\"The Engineering and Mining Journal 1906-03-10: Vol 81 Iss 10\",\"date\":\"1906-03-10\"},{\"title\":\"The Engineering and Mining Journal 1901-11-30: Vol 72 Iss 22\",\"date\":\"1901-11-30\"},{\"title\":\"The Engineering and Mining Journal 1903-09-19: Vol 76 Iss 12\",\"date\":\"1903-09-19\"},{\"title\":\"The Engineering and Mining Journal 1907-02-23: Vol 83 Iss 8\",\"date\":\"1907-02-23\"},{\"title\":\"The Engineering and Mining Journal 1907-05-25: Vol 83 Iss 21\",\"date\":\"1907-05-25\"},{\"title\":\"The Engineering and Mining Journal 1908-06-13: Vol 85 Iss 24\",\"date\":\"1908-06-13\"},{\"title\":\"The Engineering and Mining Journal 1908-09-19: Vol 86 Iss 12\",\"date\":\"1908-09-19\"},{\"title\":\"The Engineering and Mining Journal 1913-08-23: Vol 96 Iss 8\",\"date\":\"1913-08-23\"},{\"title\":\"The Engineering and Mining Journal 1913-12-20: Vol 96 Iss 25\",\"date\":\"1913-12-20\"},{\"title\":\"The Engineering and Mining Journal 1914-04-11: Vol 97 Iss 15\",\"date\":\"1914-04-11\"},{\"title\":\"The Engineering and Mining Journal 1909-08-14: Vol 88 Iss 7\",\"date\":\"1909-08-14\"},{\"title\":\"The Engineering and Mining Journal 1910-04-16: Vol 89 Iss 16\",\"date\":\"1910-04-16\"},{\"title\":\"The Engineering and Mining Journal 1914-11-07: Vol 98 Iss 19\",\"date\":\"1914-11-07\"},{\"title\":\"The Engineering and Mining Journal 1915-03-20: Vol 99 Iss 12\",\"date\":\"1915-03-20\"},{\"title\":\"The Engineering and Mining Journal 1915-05-15: Vol 99 Iss 20\",\"date\":\"1915-05-15\"},{\"title\":\"Engineering and Mining Journal 1918-07-06: Vol 106 Iss 1\",\"date\":\"1918-07-06\"},{\"title\":\"Engineering and Mining Journal 1918-09-21: Vol 106 Iss 12\",\"date\":\"1918-09-21\"},{\"title\":\"Engineering and Mining Journal 1918-10-12: Vol 106 Iss 15\",\"date\":\"1918-10-12\"},{\"title\":\"Engineering and Mining Journal 1919-05-17: Vol 107 Iss 20\",\"date\":\"1919-05-17\"},{\"title\":\"Engineering and Mining Journal 1928-07-28: Vol 126 Iss 4\",\"date\":\"1928-07-28\"},{\"title\":\"Engineering and Mining Journal 1929-01-19: Vol 127 Iss 3\",\"date\":\"1929-01-19\"},{\"title\":\"Engineering and Mining Journal 1926-12-11: Vol 122 Iss 24\",\"date\":\"1926-12-11\"},{\"title\":\"Engineering and Mining Journal 1927-03-12: Vol 123 Iss 11\",\"date\":\"1927-03-12\"},{\"title\":\"Engineering and Mining Journal 1927-10-01: Vol 124 Iss 14\",\"date\":\"1927-10-01\"},{\"title\":\"Engineering and Mining Journal 1929-09-28: Vol 128 Iss 13\",\"date\":\"1929-09-28\"},{\"title\":\"Engineering and Mining Journal 1930-02-08: Vol 129 Iss 3\",\"date\":\"1930-02-08\"},{\"title\":\"Engineering and Mining Journal 1930-06-23: Vol 129 Iss 12\",\"date\":\"1930-06-23\"},{\"title\":\"Engineering and Mining Journal 1934-08: Vol 135 Iss 8\",\"date\":\"1934-08-01\"},{\"title\":\"Engineering and Mining Journal 1935-01: Vol 136 Iss 1\",\"date\":\"1935-01-01\"},{\"title\":\"Engineering and Mining Journal 1960-10: Vol 161 Iss 10\",\"date\":\"1960-10-01\"},{\"title\":\"Engineering and Mining Journal 1961-01: Vol 162 Iss 1\",\"date\":\"1961-01-01\"},{\"title\":\"Engineering and Mining Journal 1961-11: Vol 162 Iss 11\",\"date\":\"1961-11-01\"},{\"title\":\"Engineering and Mining Journal 1945-06: Vol 146 Iss 6\",\"date\":\"1945-06-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1905: Vol 79 Index\",\"date\":\"1905-01-01\"},{\"title\":\"Engineering and Mining Journal July 1-December 1919: Vol 108 Index\",\"date\":\"1919-07-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1883: Vol 36 Index\",\"date\":\"1883-07-01\"},{\"title\":\"Engineering and Mining Journal January-December 1934: Vol 135 Index\",\"date\":\"1934-01-01\"},{\"title\":\"American Journal of Mining January-June 1868: Vol 5 Index\",\"date\":\"1868-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1876: Vol 21 Index\",\"date\":\"1876-01-01\"},{\"title\":\"Engineering and Mining Journal 1954-10: Vol 155 Iss 10\",\"date\":\"1954-10-01\"},{\"title\":\"The Engineering and Mining Journal 1904-07-14: Vol 78 Iss 2\",\"date\":\"1904-07-14\"},{\"title\":\"The Engineering and Mining Journal 1904-09-01: Vol 78 Iss 9\",\"date\":\"1904-09-01\"},{\"title\":\"The Engineering and Mining Journal 1904-09-29: Vol 78 Iss 13\",\"date\":\"1904-09-29\"},{\"title\":\"The Engineering and Mining Journal 1904-12-15: Vol 78 Iss 24\",\"date\":\"1904-12-15\"},{\"title\":\"The Engineering and Mining Journal 1905-03-30: Vol 79 Iss 13\",\"date\":\"1905-03-30\"},{\"title\":\"The Engineering and Mining Journal 1910-10-01: Vol 90 Iss 14\",\"date\":\"1910-10-01\"},{\"title\":\"The Engineering and Mining Journal 1911-02-04: Vol 91 Iss 5\",\"date\":\"1911-02-04\"},{\"title\":\"The Engineering and Mining Journal 1911-08-26: Vol 92 Iss 9\",\"date\":\"1911-08-26\"},{\"title\":\"The Engineering and Mining Journal 1915-12-18: Vol 100 Iss 25\",\"date\":\"1915-12-18\"},{\"title\":\"Engineering and Mining Journal 1916-08-19: Vol 102 Iss 8\",\"date\":\"1916-08-19\"},{\"title\":\"The Engineering and Mining Journal 1913-01-18: Vol 95 Iss 3\",\"date\":\"1913-01-18\"},{\"title\":\"The Engineering and Mining Journal 1913-02-15: Vol 95 Iss 7\",\"date\":\"1913-02-15\"},{\"title\":\"The Engineering and Mining Journal 1913-05-03: Vol 95 Iss 18\",\"date\":\"1913-05-03\"},{\"title\":\"Engineering and Mining Journal 1917-01-06: Vol 103 Iss 1\",\"date\":\"1917-01-06\"},{\"title\":\"Engineering and Mining Journal 1917-08-18: Vol 104 Iss 7\",\"date\":\"1917-08-18\"},{\"title\":\"Engineering and Mining Journal 1917-09-15: Vol 104 Iss 11\",\"date\":\"1917-09-15\"},{\"title\":\"Engineering and Mining Journal 1920-12-25: Vol 110 Iss 26\",\"date\":\"1920-12-25\"},{\"title\":\"Engineering and Mining Journal 1919-08-02: Vol 108 Iss 5\",\"date\":\"1919-08-02\"},{\"title\":\"Engineering and Mining Journal 1926-07-24: Vol 122 Iss 4\",\"date\":\"1926-07-24\"},{\"title\":\"Engineering and Mining Journal 1926-10-02: Vol 122 Iss 14\",\"date\":\"1926-10-02\"},{\"title\":\"Engineering and Mining Journal 1950-07: Vol 151 Iss 7\",\"date\":\"1950-07-01\"},{\"title\":\"Engineering and Mining Journal 1941-04: Vol 142 Iss 4\",\"date\":\"1941-04-01\"},{\"title\":\"Engineering and Mining Journal 1943-02: Vol 144 Iss 2\",\"date\":\"1943-02-01\"},{\"title\":\"Engineering and Mining Journal 1943-06: Vol 144 Iss 6\",\"date\":\"1943-06-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1900: Vol 70 Index\",\"date\":\"1900-07-01\"},{\"title\":\"American Journal of Mining 1869-04-24: Vol 7 Iss 17\",\"date\":\"1869-04-24\"},{\"title\":\"The Engineering and Mining Journal 1874-04-18: Vol 17 Iss 16\",\"date\":\"1874-04-18\"},{\"title\":\"The Engineering and Mining Journal 1885-10-24: Vol 40 Iss 17\",\"date\":\"1885-10-24\"},{\"title\":\"The Engineering and Mining Journal 1886-09-11: Vol 42 Iss 11\",\"date\":\"1886-09-11\"},{\"title\":\"The Engineering and Mining Journal 1895-11-30: Vol 60 Iss 22\",\"date\":\"1895-11-30\"},{\"title\":\"The Engineering and Mining Journal 1905-02-09: Vol 79 Iss 6\",\"date\":\"1905-02-09\"},{\"title\":\"The Engineering and Mining Journal 1906-07-21: Vol 82 Iss 3\",\"date\":\"1906-07-21\"},{\"title\":\"The Engineering and Mining Journal 1913-03-29: Vol 95 Iss 13\",\"date\":\"1913-03-29\"},{\"title\":\"The Engineering and Mining Journal 1913-09-20: Vol 96 Iss 12\",\"date\":\"1913-09-20\"},{\"title\":\"The Engineering and Mining Journal 1915-01-23: Vol 99 Iss 4\",\"date\":\"1915-01-23\"},{\"title\":\"The Engineering and Mining Journal 1915-05-01: Vol 99 Iss 18\",\"date\":\"1915-05-01\"},{\"title\":\"Engineering and Mining Journal 1920-03-06: Vol 109 Iss 10\",\"date\":\"1920-03-06\"},{\"title\":\"Engineering and Mining Journal 1927-03-26: Vol 123 Iss 13\",\"date\":\"1927-03-26\"},{\"title\":\"Engineering and Mining Journal 1993: Vol 194 Index\",\"date\":\"1993-01-01\"},{\"title\":\"The Engineering and Mining Journal January 1-June 30, 1912: Vol 93 Index\",\"date\":\"1912-01-01\"},{\"title\":\"American Journal of Mining 1866-08-18: Vol 1 Iss 21\",\"date\":\"1866-08-18\"},{\"title\":\"American Journal of Mining 1867-08-31: Vol 4 Iss 9\",\"date\":\"1867-08-31\"},{\"title\":\"The Engineering and Mining Journal 1872-12-03: Vol 14 Iss 23\",\"date\":\"1872-12-03\"},{\"title\":\"The Engineering and Mining Journal 1879-09-13: Vol 28 Iss 11\",\"date\":\"1879-09-13\"},{\"title\":\"The Engineering and Mining Journal 1876-10-07: Vol 22 Iss 15\",\"date\":\"1876-10-07\"},{\"title\":\"The Engineering and Mining Journal 1890-11-01: Vol 50 Iss 18\",\"date\":\"1890-11-01\"},{\"title\":\"The Engineering and Mining Journal 1911-01-21: Vol 91 Iss 3\",\"date\":\"1911-01-21\"},{\"title\":\"The Engineering and Mining Journal 1909-04-03: Vol 87 Iss 14\",\"date\":\"1909-04-03\"},{\"title\":\"The Engineering and Mining Journal 1916-05-27: Vol 101 Iss 22\",\"date\":\"1916-05-27\"},{\"title\":\"Engineering and Mining Journal 1916-08-26: Vol 102 Iss 9\",\"date\":\"1916-08-26\"},{\"title\":\"Engineering and Mining Journal 1916-09-09: Vol 102 Iss 11\",\"date\":\"1916-09-09\"},{\"title\":\"Engineering and Mining Journal 1916-12-09: Vol 102 Iss 24\",\"date\":\"1916-12-09\"},{\"title\":\"The Engineering and Mining Journal 1911-05-13: Vol 91 Iss 19\",\"date\":\"1911-05-13\"},{\"title\":\"Engineering and Mining Journal-Press 1923-09-22: Vol 116 Iss 12\",\"date\":\"1923-09-22\"},{\"title\":\"Engineering and Mining Journal-Press 1926-01-16: Vol 121 Iss 3\",\"date\":\"1926-01-16\"},{\"title\":\"Engineering and Mining Journal 1931-06-22: Vol 131 Iss 12\",\"date\":\"1931-06-22\"},{\"title\":\"The Engineering and Mining Journal July-December 1872: Vol 14 Index\",\"date\":\"1872-07-01\"},{\"title\":\"The Engineering and Mining Journal 1889-04-20: Vol 47 Iss 16\",\"date\":\"1889-04-20\"},{\"title\":\"The Engineering and Mining Journal 1886-03-27: Vol 41 Iss 13\",\"date\":\"1886-03-27\"},{\"title\":\"American Journal of Mining 1867-02-23: Vol 2 Iss 22\",\"date\":\"1867-02-23\"},{\"title\":\"American Journal of Mining 1867-10-26: Vol 4 Iss 17\",\"date\":\"1867-10-26\"},{\"title\":\"American Journal of Mining 1867-12-28: Vol 4 Iss 26\",\"date\":\"1867-12-28\"},{\"title\":\"American Journal of Mining 1868-11-07: Vol 6 Iss 19\",\"date\":\"1868-11-07\"},{\"title\":\"American Journal of Mining 1869-05-01: Vol 7 Iss 18\",\"date\":\"1869-05-01\"},{\"title\":\"The Engineering and Mining Journal 1875-09-18: Vol 20 Iss 12\",\"date\":\"1875-09-18\"},{\"title\":\"The Engineering and Mining Journal 1876-01-29: Vol 21 Iss 5\",\"date\":\"1876-01-29\"},{\"title\":\"The Engineering and Mining Journal 1876-04-08: Vol 21 Iss 15\",\"date\":\"1876-04-08\"},{\"title\":\"The Engineering and Mining Journal 1876-04-22: Vol 21 Iss 17\",\"date\":\"1876-04-22\"},{\"title\":\"The Engineering and Mining Journal 1878-05-25: Vol 25 Iss 21\",\"date\":\"1878-05-25\"},{\"title\":\"The Engineering and Mining Journal 1878-09-28: Vol 26 Iss 13\",\"date\":\"1878-09-28\"},{\"title\":\"The Engineering and Mining Journal 1878-12-14: Vol 26 Iss 24\",\"date\":\"1878-12-14\"},{\"title\":\"The Engineering and Mining Journal 1879-04-19: Vol 27 Iss 16\",\"date\":\"1879-04-19\"},{\"title\":\"The Engineering and Mining Journal 1879-08-02: Vol 28 Iss 5\",\"date\":\"1879-08-02\"},{\"title\":\"The Engineering and Mining Journal 1879-10-04: Vol 28 Iss 14\",\"date\":\"1879-10-04\"},{\"title\":\"The Engineering and Mining Journal 1879-12-13: Vol 28 Iss 24\",\"date\":\"1879-12-13\"},{\"title\":\"The Engineering and Mining Journal 1881-01-15: Vol 31 Iss 3\",\"date\":\"1881-01-15\"},{\"title\":\"The Engineering and Mining Journal 1882-05-27: Vol 33 Iss 21\",\"date\":\"1882-05-27\"},{\"title\":\"The Engineering and Mining Journal 1882-09-09: Vol 34 Iss 11\",\"date\":\"1882-09-09\"},{\"title\":\"The Engineering and Mining Journal 1894-08-25: Vol 58 Iss 8\",\"date\":\"1894-08-25\"},{\"title\":\"The Engineering and Mining Journal 1895-07-06: Vol 60 Iss 1\",\"date\":\"1895-07-06\"},{\"title\":\"The Engineering and Mining Journal 1890-06-28: Vol 49 Iss 26\",\"date\":\"1890-06-28\"},{\"title\":\"The Engineering and Mining Journal 1891-01-17: Vol 51 Iss 3\",\"date\":\"1891-01-17\"},{\"title\":\"The Engineering and Mining Journal 1891-04-11: Vol 51 Iss 15\",\"date\":\"1891-04-11\"},{\"title\":\"The Engineering and Mining Journal 1897-05-08: Vol 63 Iss 19\",\"date\":\"1897-05-08\"},{\"title\":\"The Engineering and Mining Journal 1897-11-27: Vol 64 Iss 22\",\"date\":\"1897-11-27\"},{\"title\":\"The Engineering and Mining Journal 1909-09-25: Vol 88 Iss 13\",\"date\":\"1909-09-25\"},{\"title\":\"The Engineering and Mining Journal 1910-10-22: Vol 90 Iss 17\",\"date\":\"1910-10-22\"},{\"title\":\"The Engineering and Mining Journal 1910-11-26: Vol 90 Iss 22\",\"date\":\"1910-11-26\"},{\"title\":\"The Engineering and Mining Journal 1912-03-16: Vol 93 Iss 11\",\"date\":\"1912-03-16\"},{\"title\":\"The Engineering and Mining Journal 1913-07-05: Vol 96 Iss 1\",\"date\":\"1913-07-05\"},{\"title\":\"The Engineering and Mining Journal 1913-12-06: Vol 96 Iss 23\",\"date\":\"1913-12-06\"},{\"title\":\"The Engineering and Mining Journal 1914-03-28: Vol 97 Iss 13\",\"date\":\"1914-03-28\"},{\"title\":\"The Engineering and Mining Journal 1915-10-16: Vol 100 Iss 16\",\"date\":\"1915-10-16\"},{\"title\":\"Engineering and Mining Journal 1918-02-16: Vol 105 Iss 7\",\"date\":\"1918-02-16\"},{\"title\":\"Engineering and Mining Journal 1918-03-09: Vol 105 Iss 10\",\"date\":\"1918-03-09\"},{\"title\":\"Engineering and Mining Journal 1927-06-25: Vol 123 Iss 26\",\"date\":\"1927-06-25\"},{\"title\":\"Engineering and Mining Journal 1954-06: Vol 155 Iss 6\",\"date\":\"1954-06-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1890: Vol 50 Index\",\"date\":\"1890-07-01\"},{\"title\":\"The Engineering and Mining Journal 1912-07-20: Vol 94 Iss 3\",\"date\":\"1912-07-20\"},{\"title\":\"The Engineering and Mining Journal 1872-11-12: Vol 14 Iss 20\",\"date\":\"1872-11-12\"},{\"title\":\"The Engineering and Mining Journal 1874-03-28: Vol 17 Iss 13\",\"date\":\"1874-03-28\"},{\"title\":\"The Engineering and Mining Journal 1874-12-05: Vol 18 Iss 23\",\"date\":\"1874-12-05\"},{\"title\":\"The Engineering and Mining Journal 1877-02-17: Vol 23 Iss 7\",\"date\":\"1877-02-17\"},{\"title\":\"The Engineering and Mining Journal 1881-05-07: Vol 31 Iss 19\",\"date\":\"1881-05-07\"},{\"title\":\"The Engineering and Mining Journal 1881-05-14: Vol 31 Iss 20\",\"date\":\"1881-05-14\"},{\"title\":\"The Engineering and Mining Journal 1882-03-25: Vol 33 Iss 12\",\"date\":\"1882-03-25\"},{\"title\":\"The Engineering and Mining Journal 1883-10-06: Vol 36 Iss 14\",\"date\":\"1883-10-06\"},{\"title\":\"The Engineering and Mining Journal 1892-10-15: Vol 54 Iss 16\",\"date\":\"1892-10-15\"},{\"title\":\"The Engineering and Mining Journal 1893-03-25: Vol 55 Iss 12\",\"date\":\"1893-03-25\"},{\"title\":\"The Engineering and Mining Journal 1898-07-02: Vol 66 Iss 1\",\"date\":\"1898-07-02\"},{\"title\":\"The Engineering and Mining Journal 1899-05-13: Vol 67 Iss 19\",\"date\":\"1899-05-13\"},{\"title\":\"The Engineering and Mining Journal 1903-10-10: Vol 76 Iss 15\",\"date\":\"1903-10-10\"},{\"title\":\"The Engineering and Mining Journal 1905-04-20: Vol 79 Iss 16\",\"date\":\"1905-04-20\"},{\"title\":\"The Engineering and Mining Journal 1905-12-23: Vol 80 Iss 25\",\"date\":\"1905-12-23\"},{\"title\":\"The Engineering and Mining Journal 1909-07-24: Vol 88 Iss 4\",\"date\":\"1909-07-24\"},{\"title\":\"The Engineering and Mining Journal 1911-06-03: Vol 91 Iss 22\",\"date\":\"1911-06-03\"},{\"title\":\"The Engineering and Mining Journal 1912-01-27: Vol 93 Iss 4\",\"date\":\"1912-01-27\"},{\"title\":\"Engineering and Mining Journal 1929-04-20: Vol 127 Iss 16\",\"date\":\"1929-04-20\"},{\"title\":\"Engineering and Mining Journal 1931-02-09: Vol 131 Iss 3\",\"date\":\"1931-02-09\"},{\"title\":\"Engineering and Mining Journal 1932-08: Vol 133 Iss 8\",\"date\":\"1932-08-01\"},{\"title\":\"Engineering and Mining Journal 1934-01: Vol 135 Iss 1\",\"date\":\"1934-01-01\"},{\"title\":\"Engineering and Mining Journal 1957-11: Vol 158 Iss 11\",\"date\":\"1957-11-01\"},{\"title\":\"Engineering and Mining Journal 1958-06: Vol 159 Iss 6\",\"date\":\"1958-06-01\"},{\"title\":\"Engineering and Mining Journal 1959-09: Vol 160 Iss 9\",\"date\":\"1959-09-01\"},{\"title\":\"Engineering and Mining Journal January 1-June 30, 1918: Vol 105 Index\",\"date\":\"1918-01-01\"},{\"title\":\"Engineering and Mining Journal January-December 1942: Vol 143 Index\",\"date\":\"1942-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1877: Vol 23 Index\",\"date\":\"1877-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1879: Vol 27 Index\",\"date\":\"1879-01-01\"},{\"title\":\"The Engineering and Mining Journal July 1-December 31, 1913: Vol 96 Index\",\"date\":\"1913-07-01\"},{\"title\":\"The Engineering and Mining Journal July 1-December 31, 1914: Vol 98 Index\",\"date\":\"1914-07-01\"},{\"title\":\"American Journal of Mining 1866-12-22: Vol 2 Iss 13\",\"date\":\"1866-12-22\"},{\"title\":\"American Journal of Mining 1867-05-04: Vol 3 Iss 6\",\"date\":\"1867-05-04\"},{\"title\":\"American Journal of Mining 1869-03-20: Vol 7 Iss 12\",\"date\":\"1869-03-20\"},{\"title\":\"The Engineering and Mining Journal 1869-09-21: Vol 8 Iss 12\",\"date\":\"1869-09-21\"},{\"title\":\"The Engineering and Mining Journal 1870-01-25: Vol 9 Iss 4\",\"date\":\"1870-01-25\"},{\"title\":\"The Engineering and Mining Journal 1870-08-02: Vol 10 Iss 5\",\"date\":\"1870-08-02\"},{\"title\":\"The Engineering and Mining Journal 1870-09-13: Vol 10 Iss 11\",\"date\":\"1870-09-13\"},{\"title\":\"The Engineering and Mining Journal 1870-12-06: Vol 10 Iss 23\",\"date\":\"1870-12-06\"},{\"title\":\"The Engineering and Mining Journal 1871-04-04: Vol 11 Iss 14\",\"date\":\"1871-04-04\"},{\"title\":\"The Engineering and Mining Journal 1879-02-22: Vol 27 Iss 8\",\"date\":\"1879-02-22\"},{\"title\":\"The Engineering and Mining Journal 1879-03-22: Vol 27 Iss 12\",\"date\":\"1879-03-22\"},{\"title\":\"The Engineering and Mining Journal 1879-08-30: Vol 28 Iss 9\",\"date\":\"1879-08-30\"},{\"title\":\"The Engineering and Mining Journal 1879-11-15: Vol 28 Iss 20\",\"date\":\"1879-11-15\"},{\"title\":\"The Engineering and Mining Journal 1885-12-26: Vol 40 Iss 26\",\"date\":\"1885-12-26\"},{\"title\":\"The Engineering and Mining Journal 1888-07-07: Vol 46 Iss 1\",\"date\":\"1888-07-07\"},{\"title\":\"The Engineering and Mining Journal 1889-07-20: Vol 48 Iss 3\",\"date\":\"1889-07-20\"},{\"title\":\"The Engineering and Mining Journal 1890-11-08: Vol 50 Iss 19\",\"date\":\"1890-11-08\"},{\"title\":\"The Engineering and Mining Journal 1891-01-10: Vol 51 Iss 2\",\"date\":\"1891-01-10\"},{\"title\":\"The Engineering and Mining Journal 1902-05-24: Vol 73 Iss 21\",\"date\":\"1902-05-24\"},{\"title\":\"The Engineering and Mining Journal 1907-05-11: Vol 83 Iss 19\",\"date\":\"1907-05-11\"},{\"title\":\"The Engineering and Mining Journal 1914-09-12: Vol 98 Iss 11\",\"date\":\"1914-09-12\"},{\"title\":\"The Engineering and Mining Journal 1915-09-18: Vol 100 Iss 12\",\"date\":\"1915-09-18\"},{\"title\":\"The Engineering and Mining Journal 1916-02-26: Vol 101 Iss 9\",\"date\":\"1916-02-26\"},{\"title\":\"The Engineering and Mining Journal 1916-06-10: Vol 101 Iss 24\",\"date\":\"1916-06-10\"},{\"title\":\"Engineering and Mining Journal 1916-10-07: Vol 102 Iss 15\",\"date\":\"1916-10-07\"},{\"title\":\"Engineering and Mining Journal 1917-01-20: Vol 103 Iss 3\",\"date\":\"1917-01-20\"},{\"title\":\"Engineering and Mining Journal 1919-05-10: Vol 107 Iss 19\",\"date\":\"1919-05-10\"},{\"title\":\"Engineering and Mining Journal 1921-05-21: Vol 111 Iss 21\",\"date\":\"1921-05-21\"},{\"title\":\"Engineering and Mining Journal-Press 1922-07-15: Vol 114 Iss 3\",\"date\":\"1922-07-15\"},{\"title\":\"Engineering and Mining Journal-Press 1922: Vol 114 Index\",\"date\":\"1922-01-01\"},{\"title\":\"Engineering and Mining Journal-Press 1925-07-25: Vol 120 Iss 4\",\"date\":\"1925-07-25\"},{\"title\":\"Engineering and Mining Journal-Press 1925-08-22: Vol 120 Iss 8\",\"date\":\"1925-08-22\"},{\"title\":\"Engineering and Mining Journal-Press 1925-12-12: Vol 120 Iss 24\",\"date\":\"1925-12-12\"},{\"title\":\"Engineering and Mining Journal 1937-02: Vol 138 Iss 2\",\"date\":\"1937-02-01\"},{\"title\":\"Engineering and Mining Journal 1942-06: Vol 143 Iss 6\",\"date\":\"1942-06-01\"},{\"title\":\"Engineering and Mining Journal 1947-03: Vol 148 Iss 3\",\"date\":\"1947-03-01\"},{\"title\":\"Engineering and Mining Journal 1949-05: Vol 150 Iss 5\",\"date\":\"1949-05-01\"},{\"title\":\"The Engineering and Mining Journal 1869-08-24: Vol 8 Iss 8\",\"date\":\"1869-08-24\"},{\"title\":\"The Engineering and Mining Journal 1870-03-08: Vol 9 Iss 10\",\"date\":\"1870-03-08\"},{\"title\":\"The Engineering and Mining Journal 1870-08-30: Vol 10 Iss 9\",\"date\":\"1870-08-30\"},{\"title\":\"The Engineering and Mining Journal 1871-02-07: Vol 11 Iss 6\",\"date\":\"1871-02-07\"},{\"title\":\"The Engineering and Mining Journal 1871-09-19: Vol 12 Iss 12\",\"date\":\"1871-09-19\"},{\"title\":\"The Engineering and Mining Journal 1872-07-09: Vol 14 Iss 2\",\"date\":\"1872-07-09\"},{\"title\":\"The Engineering and Mining Journal 1875-04-24: Vol 19 Iss 17\",\"date\":\"1875-04-24\"},{\"title\":\"The Engineering and Mining Journal 1874-06-20: Vol 17 Iss 25\",\"date\":\"1874-06-20\"},{\"title\":\"The Engineering and Mining Journal 1880-08-28: Vol 30 Iss 9\",\"date\":\"1880-08-28\"},{\"title\":\"The Engineering and Mining Journal 1880-12-18: Vol 30 Iss 25\",\"date\":\"1880-12-18\"},{\"title\":\"The Engineering and Mining Journal 1884-09-20: Vol 38 Iss 12\",\"date\":\"1884-09-20\"},{\"title\":\"The Engineering and Mining Journal 1884-10-04: Vol 38 Iss 14\",\"date\":\"1884-10-04\"},{\"title\":\"The Engineering and Mining Journal 1884-11-29: Vol 38 Iss 22\",\"date\":\"1884-11-29\"},{\"title\":\"The Engineering and Mining Journal 1885-02-21: Vol 39 Iss 8\",\"date\":\"1885-02-21\"},{\"title\":\"The Engineering and Mining Journal 1881-11-19: Vol 32 Iss 21\",\"date\":\"1881-11-19\"},{\"title\":\"The Engineering and Mining Journal 1888-10-20: Vol 46 Iss 16\",\"date\":\"1888-10-20\"},{\"title\":\"The Engineering and Mining Journal 1892-07-23: Vol 54 Iss 4\",\"date\":\"1892-07-23\"},{\"title\":\"The Engineering and Mining Journal 1894-09-15: Vol 58 Iss 11\",\"date\":\"1894-09-15\"},{\"title\":\"The Engineering and Mining Journal 1895-04-20: Vol 59 Iss 16\",\"date\":\"1895-04-20\"},{\"title\":\"The Engineering and Mining Journal 1895-07-13: Vol 60 Iss 2\",\"date\":\"1895-07-13\"},{\"title\":\"The Engineering and Mining Journal 1891-08-08: Vol 52 Iss 6\",\"date\":\"1891-08-08\"},{\"title\":\"The Engineering and Mining Journal 1897-07-24: Vol 64 Iss 4\",\"date\":\"1897-07-24\"},{\"title\":\"The Engineering and Mining Journal 1897-12-18: Vol 64 Iss 25\",\"date\":\"1897-12-18\"},{\"title\":\"The Engineering and Mining Journal 1893-03-04: Vol 55 Iss 9\",\"date\":\"1893-03-04\"},{\"title\":\"The Engineering and Mining Journal 1893-03-11: Vol 55 Iss 10\",\"date\":\"1893-03-11\"},{\"title\":\"The Engineering and Mining Journal 1896-03-28: Vol 61 Iss 13\",\"date\":\"1896-03-28\"},{\"title\":\"The Engineering and Mining Journal 1902-07-19: Vol 74 Iss 3\",\"date\":\"1902-07-19\"},{\"title\":\"The Engineering and Mining Journal 1902-10-18: Vol 74 Iss 16\",\"date\":\"1902-10-18\"},{\"title\":\"The Engineering and Mining Journal 1906-10-27: Vol 82 Iss 17\",\"date\":\"1906-10-27\"},{\"title\":\"The Engineering and Mining Journal 1903-08-22: Vol 76 Iss 8\",\"date\":\"1903-08-22\"},{\"title\":\"The Engineering and Mining Journal 1903-12-26: Vol 76 Iss 26\",\"date\":\"1903-12-26\"},{\"title\":\"The Engineering and Mining Journal 1906-12-15: Vol 82 Iss 24\",\"date\":\"1906-12-15\"},{\"title\":\"The Engineering and Mining Journal 1904-11-24: Vol 78 Iss 21\",\"date\":\"1904-11-24\"},{\"title\":\"The Engineering and Mining Journal 1905-06-08: Vol 79 Iss 23\",\"date\":\"1905-06-08\"},{\"title\":\"The Engineering and Mining Journal 1908-10-10: Vol 86 Iss 15\",\"date\":\"1908-10-10\"},{\"title\":\"The Engineering and Mining Journal 1908-12-19: Vol 86 Iss 25\",\"date\":\"1908-12-19\"},{\"title\":\"The Engineering and Mining Journal 1909-03-13: Vol 87 Iss 11\",\"date\":\"1909-03-13\"},{\"title\":\"The Engineering and Mining Journal 1913-09-06: Vol 96 Iss 10\",\"date\":\"1913-09-06\"},{\"title\":\"The Engineering and Mining Journal 1913-09-13: Vol 96 Iss 11\",\"date\":\"1913-09-13\"},{\"title\":\"The Engineering and Mining Journal 1914-01-24: Vol 97 Iss 4\",\"date\":\"1914-01-24\"},{\"title\":\"The Engineering and Mining Journal 1916-02-05: Vol 101 Iss 6\",\"date\":\"1916-02-05\"},{\"title\":\"The Engineering and Mining Journal 1912-01-13: Vol 93 Iss 2\",\"date\":\"1912-01-13\"},{\"title\":\"The Engineering and Mining Journal 1912-06-08: Vol 93 Iss 23\",\"date\":\"1912-06-08\"},{\"title\":\"The Engineering and Mining Journal 1912-07-06: Vol 94 Iss 1\",\"date\":\"1912-07-06\"},{\"title\":\"The Engineering and Mining Journal 1912-08-24: Vol 94 Iss 8\",\"date\":\"1912-08-24\"},{\"title\":\"The Engineering and Mining Journal 1913-02-01: Vol 95 Iss 5\",\"date\":\"1913-02-01\"},{\"title\":\"Engineering and Mining Journal 1917-07-07: Vol 104 Iss 1\",\"date\":\"1917-07-07\"},{\"title\":\"Engineering and Mining Journal 1921-07-09: Vol 112 Iss 2\",\"date\":\"1921-07-09\"},{\"title\":\"Engineering and Mining Journal 1921-08-27: Vol 112 Iss 9\",\"date\":\"1921-08-27\"},{\"title\":\"Engineering and Mining Journal 1921-09-24: Vol 112 Iss 13\",\"date\":\"1921-09-24\"},{\"title\":\"Engineering and Mining Journal 1918-03-23: Vol 105 Iss 12\",\"date\":\"1918-03-23\"},{\"title\":\"Engineering and Mining Journal 1918-06-22: Vol 105 Iss 25\",\"date\":\"1918-06-22\"},{\"title\":\"Engineering and Mining Journal 1918-10-19: Vol 106 Iss 16\",\"date\":\"1918-10-19\"},{\"title\":\"Engineering and Mining Journal 1919-08-16: Vol 108 Iss 7\",\"date\":\"1919-08-16\"},{\"title\":\"Engineering and Mining Journal 1920-03-20: Vol 109 Iss 12\",\"date\":\"1920-03-20\"},{\"title\":\"Engineering and Mining Journal 1920-08-21: Vol 110 Iss 8\",\"date\":\"1920-08-21\"},{\"title\":\"Engineering and Mining Journal 1922-01-14: Vol 113 Iss 2\",\"date\":\"1922-01-14\"},{\"title\":\"Engineering and Mining Journal-Press 1922-06-17: Vol 113 Iss 24\",\"date\":\"1922-06-17\"},{\"title\":\"Engineering and Mining Journal-Press 1925-02-07: Vol 119 Iss 6\",\"date\":\"1925-02-07\"},{\"title\":\"Engineering and Mining Journal 1928-09-22: Vol 126 Iss 12\",\"date\":\"1928-09-22\"},{\"title\":\"Engineering and Mining Journal 1927-07-09: Vol 124 Iss 2\",\"date\":\"1927-07-09\"},{\"title\":\"Engineering and Mining Journal 1927-08-20: Vol 124 Iss 8\",\"date\":\"1927-08-20\"},{\"title\":\"Engineering and Mining Journal 1927-11-05: Vol 124 Iss 19\",\"date\":\"1927-11-05\"},{\"title\":\"Engineering and Mining Journal-Press 1926-06-26: Vol 121 Iss 26\",\"date\":\"1926-06-26\"},{\"title\":\"Engineering and Mining Journal 1934-02: Vol 135 Iss 2\",\"date\":\"1934-02-01\"},{\"title\":\"Engineering and Mining Journal 1935-11: Vol 136 Iss 11\",\"date\":\"1935-11-01\"},{\"title\":\"Engineering and Mining Journal 1945-03: Vol 146 Iss 3\",\"date\":\"1945-03-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1886: Vol 41 Index\",\"date\":\"1886-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1906: Vol 81 Index\",\"date\":\"1906-01-01\"},{\"title\":\"The Engineering and Mining Journal July 1-December 31, 1911: Vol 92 Index\",\"date\":\"1911-07-01\"},{\"title\":\"Engineering and Mining Journal Mid-June 1957: Vol 158 Iss 6A\",\"date\":\"1957-06-15\"},{\"title\":\"Engineering and Mining Journal January - December 1969: Vol 170 Index\",\"date\":\"1969-01-01\"},{\"title\":\"Engineering and Mining Journal 1955-03: Vol 156 Iss 3\",\"date\":\"1955-03-01\"},{\"title\":\"Engineering and Mining Journal 1956-03: Vol 157 Iss 3\",\"date\":\"1956-03-01\"},{\"title\":\"American Journal of Mining 1867-04-06: Vol 3 Iss 2\",\"date\":\"1867-04-06\"},{\"title\":\"The Engineering and Mining Journal 1869-11-30: Vol 8 Iss 22\",\"date\":\"1869-11-30\"},{\"title\":\"The Engineering and Mining Journal 1870-02-22: Vol 9 Iss 8\",\"date\":\"1870-02-22\"},{\"title\":\"The Engineering and Mining Journal 1870-10-04: Vol 10 Iss 14\",\"date\":\"1870-10-04\"},{\"title\":\"The Engineering and Mining Journal 1874-01-17: Vol 17 Iss 3\",\"date\":\"1874-01-17\"},{\"title\":\"The Engineering and Mining Journal 1874-01-31: Vol 17 Iss 5\",\"date\":\"1874-01-31\"},{\"title\":\"The Engineering and Mining Journal 1880-11-20: Vol 30 Iss 21\",\"date\":\"1880-11-20\"},{\"title\":\"The Engineering and Mining Journal 1881-03-12: Vol 31 Iss 11\",\"date\":\"1881-03-12\"},{\"title\":\"The Engineering and Mining Journal 1882-12-02: Vol 34 Iss 23\",\"date\":\"1882-12-02\"},{\"title\":\"The Engineering and Mining Journal 1883-02-10: Vol 35 Iss 6\",\"date\":\"1883-02-10\"},{\"title\":\"The Engineering and Mining Journal 1883-09-29: Vol 36 Iss 13\",\"date\":\"1883-09-29\"},{\"title\":\"The Engineering and Mining Journal 1885-09-26: Vol 40 Iss 13\",\"date\":\"1885-09-26\"},{\"title\":\"The Engineering and Mining Journal 1886-01-16: Vol 41 Iss 3\",\"date\":\"1886-01-16\"},{\"title\":\"The Engineering and Mining Journal 1886-04-10: Vol 41 Iss 15\",\"date\":\"1886-04-10\"},{\"title\":\"The Engineering and Mining Journal 1881-10-15: Vol 32 Iss 16\",\"date\":\"1881-10-15\"},{\"title\":\"The Engineering and Mining Journal 1887-12-31: Vol 44 Iss 27\",\"date\":\"1887-12-31\"},{\"title\":\"The Engineering and Mining Journal 1888-03-24: Vol 45 Iss 12\",\"date\":\"1888-03-24\"},{\"title\":\"The Engineering and Mining Journal 1894-08-11: Vol 58 Iss 6\",\"date\":\"1894-08-11\"},{\"title\":\"The Engineering and Mining Journal 1895-06-29: Vol 59 Iss 26\",\"date\":\"1895-06-29\"},{\"title\":\"The Engineering and Mining Journal 1893-07-15: Vol 56 Iss 3\",\"date\":\"1893-07-15\"},{\"title\":\"The Engineering and Mining Journal 1893-11-25: Vol 56 Iss 22\",\"date\":\"1893-11-25\"},{\"title\":\"The Engineering and Mining Journal 1893-12-16: Vol 56 Iss 25\",\"date\":\"1893-12-16\"},{\"title\":\"The Engineering and Mining Journal 1902-02-15: Vol 73 Iss 7\",\"date\":\"1902-02-15\"},{\"title\":\"The Engineering and Mining Journal 1902-03-01: Vol 73 Iss 9\",\"date\":\"1902-03-01\"},{\"title\":\"The Engineering and Mining Journal 1902-05-03: Vol 73 Iss 18\",\"date\":\"1902-05-03\"},{\"title\":\"The Engineering and Mining Journal 1902-07-26: Vol 74 Iss 4\",\"date\":\"1902-07-26\"},{\"title\":\"The Engineering and Mining Journal 1902-09-27: Vol 74 Iss 13\",\"date\":\"1902-09-27\"},{\"title\":\"The Engineering and Mining Journal 1898-07-16: Vol 66 Iss 3\",\"date\":\"1898-07-16\"},{\"title\":\"The Engineering and Mining Journal 1901-09-07: Vol 72 Iss 10\",\"date\":\"1901-09-07\"},{\"title\":\"The Engineering and Mining Journal 1907-10-19: Vol 84 Iss 16\",\"date\":\"1907-10-19\"},{\"title\":\"The Engineering and Mining Journal 1905-04-06: Vol 79 Iss 14\",\"date\":\"1905-04-06\"},{\"title\":\"The Engineering and Mining Journal 1915-04-10: Vol 99 Iss 15\",\"date\":\"1915-04-10\"},{\"title\":\"The Engineering and Mining Journal 1916-01-15: Vol 101 Iss 3\",\"date\":\"1916-01-15\"},{\"title\":\"The Engineering and Mining Journal 1916-03-25: Vol 101 Iss 13\",\"date\":\"1916-03-25\"},{\"title\":\"The Engineering and Mining Journal 1916-06-24: Vol 101 Iss 26\",\"date\":\"1916-06-24\"},{\"title\":\"Engineering and Mining Journal 1916-11-11: Vol 102 Iss 20\",\"date\":\"1916-11-11\"},{\"title\":\"Engineering and Mining Journal 1916-11-18: Vol 102 Iss 21\",\"date\":\"1916-11-18\"},{\"title\":\"Engineering and Mining Journal 1916-12-16: Vol 102 Iss 25\",\"date\":\"1916-12-16\"},{\"title\":\"Engineering and Mining Journal 1919-08-09: Vol 108 Iss 6\",\"date\":\"1919-08-09\"},{\"title\":\"Engineering and Mining Journal 1919-11-01: Vol 108 Iss 18\",\"date\":\"1919-11-01\"},{\"title\":\"Engineering and Mining Journal 1920-05-22: Vol 109 Iss 21\",\"date\":\"1920-05-22\"},{\"title\":\"Engineering and Mining Journal 1926-10-23: Vol 122 Iss 17\",\"date\":\"1926-10-23\"},{\"title\":\"Engineering and Mining Journal 1927-05-07: Vol 123 Iss 19\",\"date\":\"1927-05-07\"},{\"title\":\"Engineering and Mining Journal 1927-05-21: Vol 123 Iss 21\",\"date\":\"1927-05-21\"},{\"title\":\"Engineering and Mining Journal 1950-06: Vol 151 Iss 6\",\"date\":\"1950-06-01\"},{\"title\":\"Engineering and Mining Journal 1951-02: Vol 152 Iss 2\",\"date\":\"1951-02-01\"},{\"title\":\"Engineering and Mining Journal 1954-02: Vol 155 Iss 2\",\"date\":\"1954-02-01\"},{\"title\":\"Engineering and Mining Journal 1956-02: Vol 157 Iss 2\",\"date\":\"1956-02-01\"},{\"title\":\"American Journal of Mining 1868-08-29: Vol 6 Iss 9\",\"date\":\"1868-08-29\"},{\"title\":\"American Journal of Mining 1868-10-31: Vol 6 Iss 18\",\"date\":\"1868-10-31\"},{\"title\":\"American Journal of Mining 1869-03-06: Vol 7 Iss 10\",\"date\":\"1869-03-06\"},{\"title\":\"The Engineering and Mining Journal 1871-01-31: Vol 11 Iss 5\",\"date\":\"1871-01-31\"},{\"title\":\"The Engineering and Mining Journal 1871-10-17: Vol 12 Iss 16\",\"date\":\"1871-10-17\"},{\"title\":\"The Engineering and Mining Journal 1871-11-28: Vol 12 Iss 22\",\"date\":\"1871-11-28\"},{\"title\":\"The Engineering and Mining Journal 1871-12-19: Vol 12 Iss 25\",\"date\":\"1871-12-19\"},{\"title\":\"The Engineering and Mining Journal 1875-06-12: Vol 19 Iss 24\",\"date\":\"1875-06-12\"},{\"title\":\"The Engineering and Mining Journal 1875-12-04: Vol 20 Iss 23\",\"date\":\"1875-12-04\"},{\"title\":\"The Engineering and Mining Journal 1890-07-19: Vol 50 Iss 3\",\"date\":\"1890-07-19\"},{\"title\":\"The Engineering and Mining Journal 1892-02-20: Vol 53 Iss 8\",\"date\":\"1892-02-20\"},{\"title\":\"The Engineering and Mining Journal 1892-03-05: Vol 53 Iss 10\",\"date\":\"1892-03-05\"},{\"title\":\"The Engineering and Mining Journal 1891-01-31: Vol 51 Iss 5\",\"date\":\"1891-01-31\"},{\"title\":\"The Engineering and Mining Journal 1896-04-04: Vol 61 Iss 14\",\"date\":\"1896-04-04\"},{\"title\":\"The Engineering and Mining Journal 1896-04-25: Vol 61 Iss 17\",\"date\":\"1896-04-25\"},{\"title\":\"The Engineering and Mining Journal 1896-07-04: Vol 62 Iss 1\",\"date\":\"1896-07-04\"},{\"title\":\"The Engineering and Mining Journal 1899-08-19: Vol 68 Iss 8\",\"date\":\"1899-08-19\"},{\"title\":\"The Engineering and Mining Journal 1900-07-21: Vol 70 Iss 3\",\"date\":\"1900-07-21\"},{\"title\":\"The Engineering and Mining Journal 1905-11-25: Vol 80 Iss 21\",\"date\":\"1905-11-25\"},{\"title\":\"The Engineering and Mining Journal 1906-01-20: Vol 81 Iss 3\",\"date\":\"1906-01-20\"},{\"title\":\"The Engineering and Mining Journal 1906-08-04: Vol 82 Iss 5\",\"date\":\"1906-08-04\"},{\"title\":\"The Engineering and Mining Journal 1906-09-08: Vol 82 Iss 10\",\"date\":\"1906-09-08\"},{\"title\":\"The Engineering and Mining Journal 1903-06-06: Vol 75 Iss 23\",\"date\":\"1903-06-06\"},{\"title\":\"The Engineering and Mining Journal 1903-12-19: Vol 76 Iss 25\",\"date\":\"1903-12-19\"},{\"title\":\"The Engineering and Mining Journal 1909-05-29: Vol 87 Iss 22\",\"date\":\"1909-05-29\"},{\"title\":\"The Engineering and Mining Journal 1909-06-26: Vol 87 Iss 26\",\"date\":\"1909-06-26\"},{\"title\":\"The Engineering and Mining Journal 1914-06-20: Vol 97 Iss 25\",\"date\":\"1914-06-20\"},{\"title\":\"The Engineering and Mining Journal 1911-03-18: Vol 91 Iss 11\",\"date\":\"1911-03-18\"},{\"title\":\"The Engineering and Mining Journal 1911-10-07: Vol 92 Iss 15\",\"date\":\"1911-10-07\"},{\"title\":\"The Engineering and Mining Journal 1912-04-13: Vol 93 Iss 15\",\"date\":\"1912-04-13\"},{\"title\":\"Engineering and Mining Journal 1917-04-07: Vol 103 Iss 14\",\"date\":\"1917-04-07\"},{\"title\":\"Engineering and Mining Journal 1921-03-05: Vol 111 Iss 10\",\"date\":\"1921-03-05\"},{\"title\":\"Engineering and Mining Journal 1921-06-25: Vol 111 Iss 26\",\"date\":\"1921-06-25\"},{\"title\":\"Engineering and Mining Journal 1918-06-29: Vol 105 Iss 26\",\"date\":\"1918-06-29\"},{\"title\":\"Engineering and Mining Journal-Press 1923-06-16: Vol 115 Iss 24\",\"date\":\"1923-06-16\"},{\"title\":\"Engineering and Mining Journal-Press 1922-08-05: Vol 114 Iss 6\",\"date\":\"1922-08-05\"},{\"title\":\"Engineering and Mining Journal-Press 1925-05-16: Vol 119 Iss 20\",\"date\":\"1925-05-16\"},{\"title\":\"Engineering and Mining Journal 1928-01-07: Vol 125 Iss 1\",\"date\":\"1928-01-07\"},{\"title\":\"Engineering and Mining Journal 1928-03-31: Vol 125 Iss 13\",\"date\":\"1928-03-31\"},{\"title\":\"Engineering and Mining Journal 1928-04-28: Vol 125 Iss 17\",\"date\":\"1928-04-28\"},{\"title\":\"Engineering and Mining Journal 1929-03-02: Vol 127 Iss 9\",\"date\":\"1929-03-02\"},{\"title\":\"Engineering and Mining Journal 1929-03-23: Vol 127 Iss 12\",\"date\":\"1929-03-23\"},{\"title\":\"Engineering and Mining Journal 1933-02: Vol 134 Iss 2\",\"date\":\"1933-02-01\"},{\"title\":\"Engineering and Mining Journal 1936-04: Vol 137 Iss 4\",\"date\":\"1936-04-01\"},{\"title\":\"Engineering and Mining Journal 1945-12: Vol 146 Iss 12\",\"date\":\"1945-12-01\"},{\"title\":\"Engineering and Mining Journal 1946-08: Vol 147 Iss 8\",\"date\":\"1946-08-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1910: Vol 89 Index\",\"date\":\"1910-01-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1873: Vol 16 Index\",\"date\":\"1873-07-01\"},{\"title\":\"Engineering and Mining Journal January - December 1971: Vol 172 Index\",\"date\":\"1971-01-01\"},{\"title\":\"Engineering and Mining Journal-Press 1922-05-13: Vol 113 Iss 19\",\"date\":\"1922-05-13\"},{\"title\":\"The Engineering and Mining Journal 1870-07-05: Vol 10 Iss 1\",\"date\":\"1870-07-05\"},{\"title\":\"The Engineering and Mining Journal 1871-05-09: Vol 11 Iss 19\",\"date\":\"1871-05-09\"},{\"title\":\"The Engineering and Mining Journal 1871-07-18: Vol 12 Iss 3\",\"date\":\"1871-07-18\"},{\"title\":\"The Engineering and Mining Journal 1873-12-16: Vol 16 Iss 25\",\"date\":\"1873-12-16\"},{\"title\":\"The Engineering and Mining Journal 1873-12-23: Vol 16 Iss 26\",\"date\":\"1873-12-23\"},{\"title\":\"The Engineering and Mining Journal 1875-03-20: Vol 19 Iss 12\",\"date\":\"1875-03-20\"},{\"title\":\"The Engineering and Mining Journal 1875-03-27: Vol 19 Iss 13\",\"date\":\"1875-03-27\"},{\"title\":\"The Engineering and Mining Journal 1885-08-01: Vol 40 Iss 5\",\"date\":\"1885-08-01\"},{\"title\":\"The Engineering and Mining Journal 1886-02-06: Vol 41 Iss 6\",\"date\":\"1886-02-06\"},{\"title\":\"The Engineering and Mining Journal 1886-09-04: Vol 42 Iss 10\",\"date\":\"1886-09-04\"},{\"title\":\"The Engineering and Mining Journal 1887-05-07: Vol 43 Iss 19\",\"date\":\"1887-05-07\"},{\"title\":\"The Engineering and Mining Journal 1887-11-05: Vol 44 Iss 19\",\"date\":\"1887-11-05\"},{\"title\":\"The Engineering and Mining Journal 1891-06-20: Vol 51 Iss 25\",\"date\":\"1891-06-20\"},{\"title\":\"The Engineering and Mining Journal 1891-07-04: Vol 52 Iss 1\",\"date\":\"1891-07-04\"},{\"title\":\"The Engineering and Mining Journal 1892-04-09: Vol 53 Iss 15\",\"date\":\"1892-04-09\"},{\"title\":\"The Engineering and Mining Journal 1893-12-30: Vol 56 Iss 27\",\"date\":\"1893-12-30\"},{\"title\":\"The Engineering and Mining Journal 1900-12-29: Vol 70 Iss 26\",\"date\":\"1900-12-29\"},{\"title\":\"The Engineering and Mining Journal 1901-12-14: Vol 72 Iss 24\",\"date\":\"1901-12-14\"},{\"title\":\"The Engineering and Mining Journal 1905-11-18: Vol 80 Iss 20\",\"date\":\"1905-11-18\"},{\"title\":\"The Engineering and Mining Journal 1908-08-08: Vol 86 Iss 6\",\"date\":\"1908-08-08\"},{\"title\":\"Engineering and Mining Journal 1920-05-01: Vol 109 Iss 18\",\"date\":\"1920-05-01\"},{\"title\":\"Engineering and Mining Journal 1920-07-24: Vol 110 Iss 4\",\"date\":\"1920-07-24\"},{\"title\":\"Engineering and Mining Journal-Press 1922-05-06: Vol 113 Iss 18\",\"date\":\"1922-05-06\"},{\"title\":\"Engineering and Mining Journal-Press 1923-01-27: Vol 115 Iss 4\",\"date\":\"1923-01-27\"},{\"title\":\"Engineering and Mining Journal-Press 1925-08-01: Vol 120 Iss 5\",\"date\":\"1925-08-01\"},{\"title\":\"Engineering and Mining Journal 1929-06-29: Vol 127 Iss 26\",\"date\":\"1929-06-29\"},{\"title\":\"Engineering and Mining Journal 1935-06: Vol 136 Iss 6\",\"date\":\"1935-06-01\"},{\"title\":\"Engineering and Mining Journal 1947-12: Vol 148 Iss 12\",\"date\":\"1947-12-01\"},{\"title\":\"Engineering and Mining Journal 1949-08: Vol 150 Iss 8\",\"date\":\"1949-08-01\"},{\"title\":\"Engineering and Mining Journal 1952-04: Vol 153 Iss 4\",\"date\":\"1952-04-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1902: Vol 74 Index\",\"date\":\"1902-07-01\"},{\"title\":\"American Journal of Mining 1867-08-17: Vol 4 Iss 7\",\"date\":\"1867-08-17\"},{\"title\":\"American Journal of Mining 1867-10-19: Vol 4 Iss 16\",\"date\":\"1867-10-19\"},{\"title\":\"American Journal of Mining 1868-04-11: Vol 5 Iss 15\",\"date\":\"1868-04-11\"},{\"title\":\"American Journal of Mining 1868-05-23: Vol 5 Iss 21\",\"date\":\"1868-05-23\"},{\"title\":\"The Engineering and Mining Journal 1871-09-12: Vol 12 Iss 11\",\"date\":\"1871-09-12\"},{\"title\":\"The Engineering and Mining Journal 1872-06-18: Vol 13 Iss 25\",\"date\":\"1872-06-18\"},{\"title\":\"The Engineering and Mining Journal 1872-09-10: Vol 14 Iss 11\",\"date\":\"1872-09-10\"},{\"title\":\"The Engineering and Mining Journal 1872-12-17: Vol 14 Iss 25\",\"date\":\"1872-12-17\"},{\"title\":\"The Engineering and Mining Journal 1873-11-11: Vol 16 Iss 20\",\"date\":\"1873-11-11\"},{\"title\":\"The Engineering and Mining Journal 1880-07-31: Vol 30 Iss 5\",\"date\":\"1880-07-31\"},{\"title\":\"The Engineering and Mining Journal 1880-09-11: Vol 30 Iss 11\",\"date\":\"1880-09-11\"},{\"title\":\"The Engineering and Mining Journal 1885-10-03: Vol 40 Iss 14\",\"date\":\"1885-10-03\"},{\"title\":\"The Engineering and Mining Journal 1895-03-30: Vol 59 Iss 13\",\"date\":\"1895-03-30\"},{\"title\":\"The Engineering and Mining Journal 1895-07-27: Vol 60 Iss 4\",\"date\":\"1895-07-27\"},{\"title\":\"The Engineering and Mining Journal 1888-11-24: Vol 46 Iss 21\",\"date\":\"1888-11-24\"},{\"title\":\"The Engineering and Mining Journal 1889-03-02: Vol 47 Iss 9\",\"date\":\"1889-03-02\"},{\"title\":\"The Engineering and Mining Journal 1890-01-18: Vol 49 Iss 3\",\"date\":\"1890-01-18\"},{\"title\":\"The Engineering and Mining Journal 1890-12-06: Vol 50 Iss 23\",\"date\":\"1890-12-06\"},{\"title\":\"The Engineering and Mining Journal 1897-04-24: Vol 63 Iss 17\",\"date\":\"1897-04-24\"},{\"title\":\"The Engineering and Mining Journal 1897-08-28: Vol 64 Iss 9\",\"date\":\"1897-08-28\"},{\"title\":\"The Engineering and Mining Journal 1898-05-07: Vol 65 Iss 19\",\"date\":\"1898-05-07\"},{\"title\":\"The Engineering and Mining Journal 1899-05-27: Vol 67 Iss 21\",\"date\":\"1899-05-27\"},{\"title\":\"The Engineering and Mining Journal 1902-10-04: Vol 74 Iss 14\",\"date\":\"1902-10-04\"},{\"title\":\"The Engineering and Mining Journal 1910-01-22: Vol 89 Iss 4\",\"date\":\"1910-01-22\"},{\"title\":\"The Engineering and Mining Journal 1910-09-03: Vol 90 Iss 10\",\"date\":\"1910-09-03\"},{\"title\":\"The Engineering and Mining Journal 1911-02-25: Vol 91 Iss 8\",\"date\":\"1911-02-25\"},{\"title\":\"The Engineering and Mining Journal 1915-10-09: Vol 100 Iss 15\",\"date\":\"1915-10-09\"},{\"title\":\"Engineering and Mining Journal-Press 1925-03-21: Vol 119 Iss 12\",\"date\":\"1925-03-21\"},{\"title\":\"Engineering and Mining Journal 1935-10: Vol 136 Iss 10\",\"date\":\"1935-10-01\"},{\"title\":\"Engineering and Mining Journal 1937-06: Vol 138 Iss 6\",\"date\":\"1937-06-01\"},{\"title\":\"Engineering and Mining Journal 1938-11: Vol 139 Iss 11\",\"date\":\"1938-11-01\"},{\"title\":\"Engineering and Mining Journal 1939-07: Vol 140 Iss 7\",\"date\":\"1939-07-01\"},{\"title\":\"Engineering and Mining Journal 1941-03: Vol 142 Iss 3\",\"date\":\"1941-03-01\"},{\"title\":\"Engineering and Mining Journal 1941-12: Vol 142 Iss 12\",\"date\":\"1941-12-01\"},{\"title\":\"Engineering and Mining Journal 1942-04: Vol 143 Iss 4\",\"date\":\"1942-04-01\"},{\"title\":\"Engineering and Mining Journal 1950-05: Vol 151 Iss 5\",\"date\":\"1950-05-01\"},{\"title\":\"Engineering and Mining Journal 1961-08: Vol 162 Iss 8\",\"date\":\"1961-08-01\"},{\"title\":\"Engineering and Mining Journal January-December 1967: Vol 168 Index\",\"date\":\"1967-01-01\"},{\"title\":\"The Engineering and Mining Journal January - June 1890: Vol 49 Index\",\"date\":\"1890-01-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1901: Vol 72 Index\",\"date\":\"1901-07-01\"},{\"title\":\"The Engineering and Mining Journal 1879-05-31: Vol 27 Iss 22\",\"date\":\"1879-05-31\"},{\"title\":\"The Engineering and Mining Journal 1879-06-07: Vol 27 Iss 23\",\"date\":\"1879-06-07\"},{\"title\":\"The Engineering and Mining Journal 1879-07-12: Vol 28 Iss 2\",\"date\":\"1879-07-12\"},{\"title\":\"The Engineering and Mining Journal 1880-04-03: Vol 29 Iss 14\",\"date\":\"1880-04-03\"},{\"title\":\"The Engineering and Mining Journal 1892-02-13: Vol 53 Iss 7\",\"date\":\"1892-02-13\"},{\"title\":\"The Engineering and Mining Journal 1892-04-30: Vol 53 Iss 18\",\"date\":\"1892-04-30\"},{\"title\":\"The Engineering and Mining Journal 1892-08-13: Vol 54 Iss 7\",\"date\":\"1892-08-13\"},{\"title\":\"The Engineering and Mining Journal 1903-01-03: Vol 75 Iss 1\",\"date\":\"1903-01-03\"},{\"title\":\"The Engineering and Mining Journal 1904-09-15: Vol 78 Iss 11\",\"date\":\"1904-09-15\"},{\"title\":\"The Engineering and Mining Journal 1906-03-31: Vol 81 Iss 13\",\"date\":\"1906-03-31\"},{\"title\":\"The Engineering and Mining Journal 1908-10-31: Vol 86 Iss 18\",\"date\":\"1908-10-31\"},{\"title\":\"The Engineering and Mining Journal 1909-01-09: Vol 87 Iss 2\",\"date\":\"1909-01-09\"},{\"title\":\"Engineering and Mining Journal 1917-06-16: Vol 103 Iss 24\",\"date\":\"1917-06-16\"},{\"title\":\"Engineering and Mining Journal 1919-03-01: Vol 107 Iss 9\",\"date\":\"1919-03-01\"},{\"title\":\"Engineering and Mining Journal 1919-05-24: Vol 107 Iss 21\",\"date\":\"1919-05-24\"},{\"title\":\"Engineering and Mining Journal 1920-12-04: Vol 110 Iss 23\",\"date\":\"1920-12-04\"},{\"title\":\"Engineering and Mining Journal-Press 1922-12-16: Vol 114 Iss 25\",\"date\":\"1922-12-16\"},{\"title\":\"Engineering and Mining Journal 1927-06-11: Vol 123 Iss 24\",\"date\":\"1927-06-11\"},{\"title\":\"Engineering and Mining Journal 1927: Vol 124 Index\",\"date\":\"1927-01-01\"},{\"title\":\"Engineering and Mining Journal 1929-05-11: Vol 127 Iss 19\",\"date\":\"1929-05-11\"},{\"title\":\"The Engineering and Mining Journal 1870-04-05: Vol 9 Iss 14\",\"date\":\"1870-04-05\"},{\"title\":\"The Engineering and Mining Journal 1870-06-14: Vol 9 Iss 24\",\"date\":\"1870-06-14\"},{\"title\":\"The Engineering and Mining Journal 1870-07-12: Vol 10 Iss 2\",\"date\":\"1870-07-12\"},{\"title\":\"The Engineering and Mining Journal 1870-08-09: Vol 10 Iss 6\",\"date\":\"1870-08-09\"},{\"title\":\"The Engineering and Mining Journal 1871-08-01: Vol 12 Iss 5\",\"date\":\"1871-08-01\"},{\"title\":\"The Engineering and Mining Journal 1873-07-15: Vol 16 Iss 3\",\"date\":\"1873-07-15\"},{\"title\":\"The Engineering and Mining Journal 1874-09-26: Vol 18 Iss 13\",\"date\":\"1874-09-26\"},{\"title\":\"The Engineering and Mining Journal 1877-03-17: Vol 23 Iss 11\",\"date\":\"1877-03-17\"},{\"title\":\"The Engineering and Mining Journal 1877-03-31: Vol 23 Iss 13\",\"date\":\"1877-03-31\"},{\"title\":\"The Engineering and Mining Journal 1877-09-29: Vol 24 Iss 13\",\"date\":\"1877-09-29\"},{\"title\":\"The Engineering and Mining Journal 1878-07-27: Vol 26 Iss 4\",\"date\":\"1878-07-27\"},{\"title\":\"The Engineering and Mining Journal 1883-12-01: Vol 36 Iss 22\",\"date\":\"1883-12-01\"},{\"title\":\"The Engineering and Mining Journal 1884-05-31: Vol 37 Iss 22\",\"date\":\"1884-05-31\"},{\"title\":\"The Engineering and Mining Journal 1885-02-14: Vol 39 Iss 7\",\"date\":\"1885-02-14\"},{\"title\":\"The Engineering and Mining Journal 1891-12-26: Vol 52 Iss 26\",\"date\":\"1891-12-26\"},{\"title\":\"The Engineering and Mining Journal 1892-06-18: Vol 53 Iss 25\",\"date\":\"1892-06-18\"},{\"title\":\"The Engineering and Mining Journal 1896-01-04: Vol 61 Iss 1\",\"date\":\"1896-01-04\"},{\"title\":\"The Engineering and Mining Journal 1896-12-12: Vol 62 Iss 24\",\"date\":\"1896-12-12\"},{\"title\":\"The Engineering and Mining Journal 1889-06-22: Vol 47 Iss 25\",\"date\":\"1889-06-22\"},{\"title\":\"The Engineering and Mining Journal 1904-02-04: Vol 77 Iss 5\",\"date\":\"1904-02-04\"},{\"title\":\"The Engineering and Mining Journal 1904-11-10: Vol 78 Iss 19\",\"date\":\"1904-11-10\"},{\"title\":\"The Engineering and Mining Journal 1905-05-04: Vol 79 Iss 18\",\"date\":\"1905-05-04\"},{\"title\":\"The Engineering and Mining Journal 1905-12-09: Vol 80 Iss 23\",\"date\":\"1905-12-09\"},{\"title\":\"The Engineering and Mining Journal 1906-07-07: Vol 82 Iss 1\",\"date\":\"1906-07-07\"},{\"title\":\"The Engineering and Mining Journal 1908-08-15: Vol 86 Iss 7\",\"date\":\"1908-08-15\"},{\"title\":\"Engineering and Mining Journal 1916-12-02: Vol 102 Iss 23\",\"date\":\"1916-12-02\"},{\"title\":\"Engineering and Mining Journal 1917-10-27: Vol 104 Iss 17\",\"date\":\"1917-10-27\"},{\"title\":\"Engineering and Mining Journal 1919-07-26: Vol 108 Iss 4\",\"date\":\"1919-07-26\"},{\"title\":\"Engineering and Mining Journal 1927: Vol 123 Index\",\"date\":\"1927-01-01\"},{\"title\":\"Engineering and Mining Journal 1928-10-06: Vol 126 Iss 14\",\"date\":\"1928-10-06\"},{\"title\":\"Engineering and Mining Journal 1929-02-16: Vol 127 Iss 7\",\"date\":\"1929-02-16\"},{\"title\":\"Engineering and Mining Journal 1930-07-10: Vol 130 Iss 1\",\"date\":\"1930-07-10\"},{\"title\":\"Engineering and Mining Journal 1930-11-10: Vol 130 Iss 9\",\"date\":\"1930-11-10\"},{\"title\":\"Engineering and Mining Journal 1931-12-28: Vol 132 Iss 12\",\"date\":\"1931-12-28\"},{\"title\":\"Engineering and Mining Journal 1938-02: Vol 139 Iss 2\",\"date\":\"1938-02-01\"},{\"title\":\"Engineering and Mining Journal January-December 1940: Vol 141 Index\",\"date\":\"1940-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1888: Vol 45 Index\",\"date\":\"1888-01-01\"},{\"title\":\"Engineering and Mining Journal July 1-Decemeber 31, 1918: Vol 106 Index\",\"date\":\"1918-01-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1892: Vol 54 Index\",\"date\":\"1892-07-01\"},{\"title\":\"American Journal of Mining 1866-12-15: Vol 2 Iss 12\",\"date\":\"1866-12-15\"},{\"title\":\"American Journal of Mining 1867-12-21: Vol 4 Iss 25\",\"date\":\"1867-12-21\"},{\"title\":\"The Engineering and Mining Journal 1878-08-17: Vol 26 Iss 7\",\"date\":\"1878-08-17\"},{\"title\":\"The Engineering and Mining Journal 1878-11-09: Vol 26 Iss 19\",\"date\":\"1878-11-09\"},{\"title\":\"The Engineering and Mining Journal 1880-08-21: Vol 30 Iss 8\",\"date\":\"1880-08-21\"},{\"title\":\"The Engineering and Mining Journal 1880-10-09: Vol 30 Iss 15\",\"date\":\"1880-10-09\"},{\"title\":\"The Engineering and Mining Journal 1882-04-29: Vol 33 Iss 17\",\"date\":\"1882-04-29\"},{\"title\":\"The Engineering and Mining Journal 1887-07-16: Vol 44 Iss 3\",\"date\":\"1887-07-16\"},{\"title\":\"The Engineering and Mining Journal 1888-05-12: Vol 45 Iss 19\",\"date\":\"1888-05-12\"},{\"title\":\"The Engineering and Mining Journal 1897-12-04: Vol 64 Iss 23\",\"date\":\"1897-12-04\"},{\"title\":\"The Engineering and Mining Journal 1898-01-29: Vol 65 Iss 5\",\"date\":\"1898-01-29\"},{\"title\":\"The Engineering and Mining Journal 1900-10-06: Vol 70 Iss 14\",\"date\":\"1900-10-06\"},{\"title\":\"The Engineering and Mining Journal 1901-10-19: Vol 72 Iss 16\",\"date\":\"1901-10-19\"},{\"title\":\"The Engineering and Mining Journal 1910-10-08: Vol 90 Iss 15\",\"date\":\"1910-10-08\"},{\"title\":\"The Engineering and Mining Journal 1915-10-30: Vol 100 Iss 18\",\"date\":\"1915-10-30\"},{\"title\":\"Engineering and Mining Journal-Press 1922-07-01: Vol 114 Iss 1\",\"date\":\"1922-07-01\"},{\"title\":\"Engineering and Mining Journal-Press 1924-06-28: Vol 117 Iss 26\",\"date\":\"1924-06-28\"},{\"title\":\"Engineering and Mining Journal-Press 1924-08-30: Vol 118 Iss 9\",\"date\":\"1924-08-30\"},{\"title\":\"Engineering and Mining Journal 1944-09: Vol 145 Iss 9\",\"date\":\"1944-09-01\"},{\"title\":\"Engineering and Mining Journal 1951-08: Vol 152 Iss 8\",\"date\":\"1951-08-01\"},{\"title\":\"Engineering and Mining Journal 1958-08: Vol 159 Iss 8\",\"date\":\"1958-08-01\"},{\"title\":\"Engineering and Mining Journal 1959-03: Vol 160 Iss 3\",\"date\":\"1959-03-01\"},{\"title\":\"American Journal of Mining 1869-02-20: Vol 7 Iss 8\",\"date\":\"1869-02-20\"},{\"title\":\"The Engineering and Mining Journal 1869-12-07: Vol 8 Iss 23\",\"date\":\"1869-12-07\"},{\"title\":\"The Engineering and Mining Journal 1873-10-21: Vol 16 Iss 17\",\"date\":\"1873-10-21\"},{\"title\":\"The Engineering and Mining Journal 1874-03-14: Vol 17 Iss 11\",\"date\":\"1874-03-14\"},{\"title\":\"The Engineering and Mining Journal 1876-04-29: Vol 21 Iss 18\",\"date\":\"1876-04-29\"},{\"title\":\"The Engineering and Mining Journal 1893-04-15: Vol 55 Iss 15\",\"date\":\"1893-04-15\"},{\"title\":\"The Engineering and Mining Journal 1893-06-10: Vol 55 Iss 23\",\"date\":\"1893-06-10\"},{\"title\":\"The Engineering and Mining Journal 1901-06-15: Vol 71 Iss 24\",\"date\":\"1901-06-15\"},{\"title\":\"The Engineering and Mining Journal 1900-09-01: Vol 70 Iss 9\",\"date\":\"1900-09-01\"},{\"title\":\"The Engineering and Mining Journal 1914-11-28: Vol 98 Iss 22\",\"date\":\"1914-11-28\"},{\"title\":\"Engineering and Mining Journal 1919-01-25: Vol 107 Iss 4\",\"date\":\"1919-01-25\"},{\"title\":\"Engineering and Mining Journal-Press 1924-03-22: Vol 117 Iss 12\",\"date\":\"1924-03-22\"},{\"title\":\"Engineering and Mining Journal-Press 1924-09-27: Vol 118 Iss 13\",\"date\":\"1924-09-27\"},{\"title\":\"The Engineering and Mining Journal 1879-02-08: Vol 27 Iss 6\",\"date\":\"1879-02-08\"},{\"title\":\"The Engineering and Mining Journal 1882-03-11: Vol 33 Iss 10\",\"date\":\"1882-03-11\"},{\"title\":\"The Engineering and Mining Journal 1886-12-25: Vol 42 Iss 26\",\"date\":\"1886-12-25\"},{\"title\":\"The Engineering and Mining Journal 1894-12-08: Vol 58 Iss 23\",\"date\":\"1894-12-08\"},{\"title\":\"The Engineering and Mining Journal 1894-04-28: Vol 57 Iss 17\",\"date\":\"1894-04-28\"},{\"title\":\"The Engineering and Mining Journal 1909-06-19: Vol 87 Iss 25\",\"date\":\"1909-06-19\"},{\"title\":\"The Engineering and Mining Journal 1916-03-11: Vol 101 Iss 11\",\"date\":\"1916-03-11\"},{\"title\":\"Engineering and Mining Journal 1928-11-17: Vol 126 Iss 20\",\"date\":\"1928-11-17\"},{\"title\":\"Engineering and Mining Journal July 1 to December 31, 1917: Vol 104 Index\",\"date\":\"1917-07-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1874: Vol 18 Index\",\"date\":\"1874-07-01\"},{\"title\":\"American Journal of Mining 1866-11-10: Vol 2 Iss 7\",\"date\":\"1866-11-10\"},{\"title\":\"American Journal of Mining 1867-03-02: Vol 2 Iss 23\",\"date\":\"1867-03-02\"},{\"title\":\"American Journal of Mining 1868-07-18: Vol 6 Iss 3\",\"date\":\"1868-07-18\"},{\"title\":\"American Journal of Mining 1868-08-15: Vol 6 Iss 7\",\"date\":\"1868-08-15\"},{\"title\":\"The Engineering and Mining Journal 1869-09-07: Vol 8 Iss 10\",\"date\":\"1869-09-07\"},{\"title\":\"The Engineering and Mining Journal 1871-03-21: Vol 11 Iss 12\",\"date\":\"1871-03-21\"},{\"title\":\"The Engineering and Mining Journal 1874-07-04: Vol 18 Iss 1\",\"date\":\"1874-07-04\"},{\"title\":\"The Engineering and Mining Journal 1875-05-01: Vol 19 Iss 18\",\"date\":\"1875-05-01\"},{\"title\":\"The Engineering and Mining Journal 1875-07-31: Vol 20 Iss 5\",\"date\":\"1875-07-31\"},{\"title\":\"The Engineering and Mining Journal 1878-06-01: Vol 25 Iss 22\",\"date\":\"1878-06-01\"},{\"title\":\"The Engineering and Mining Journal 1878-08-24: Vol 26 Iss 8\",\"date\":\"1878-08-24\"},{\"title\":\"The Engineering and Mining Journal 1879-02-01: Vol 27 Iss 5\",\"date\":\"1879-02-01\"},{\"title\":\"The Engineering and Mining Journal 1880-08-07: Vol 30 Iss 6\",\"date\":\"1880-08-07\"},{\"title\":\"The Engineering and Mining Journal 1881-05-28: Vol 31 Iss 22\",\"date\":\"1881-05-28\"},{\"title\":\"The Engineering and Mining Journal 1883-01-13: Vol 35 Iss 2\",\"date\":\"1883-01-13\"},{\"title\":\"The Engineering and Mining Journal 1883-03-17: Vol 35 Iss 11\",\"date\":\"1883-03-17\"},{\"title\":\"The Engineering and Mining Journal 1883-06-30: Vol 35 Iss 26\",\"date\":\"1883-06-30\"},{\"title\":\"The Engineering and Mining Journal 1885-05-23: Vol 39 Iss 21\",\"date\":\"1885-05-23\"},{\"title\":\"The Engineering and Mining Journal 1886-12-11: Vol 42 Iss 24\",\"date\":\"1886-12-11\"},{\"title\":\"The Engineering and Mining Journal 1888-01-07: Vol 45 Iss 1\",\"date\":\"1888-01-07\"},{\"title\":\"The Engineering and Mining Journal 1888-02-25: Vol 45 Iss 8\",\"date\":\"1888-02-25\"},{\"title\":\"The Engineering and Mining Journal 1896-09-12: Vol 62 Iss 11\",\"date\":\"1896-09-12\"},{\"title\":\"The Engineering and Mining Journal 1889-04-06: Vol 47 Iss 14\",\"date\":\"1889-04-06\"},{\"title\":\"The Engineering and Mining Journal 1889-09-14: Vol 48 Iss 11\",\"date\":\"1889-09-14\"},{\"title\":\"The Engineering and Mining Journal 1891-03-21: Vol 51 Iss 12\",\"date\":\"1891-03-21\"},{\"title\":\"The Engineering and Mining Journal 1897-03-13: Vol 63 Iss 11\",\"date\":\"1897-03-13\"},{\"title\":\"The Engineering and Mining Journal 1897-11-20: Vol 64 Iss 21\",\"date\":\"1897-11-20\"},{\"title\":\"The Engineering and Mining Journal 1898-10-01: Vol 66 Iss 14\",\"date\":\"1898-10-01\"},{\"title\":\"The Engineering and Mining Journal 1900-10-13: Vol 70 Iss 15\",\"date\":\"1900-10-13\"},{\"title\":\"The Engineering and Mining Journal 1901-05-25: Vol 71 Iss 21\",\"date\":\"1901-05-25\"},{\"title\":\"The Engineering and Mining Journal 1903-03-07: Vol 75 Iss 10\",\"date\":\"1903-03-07\"},{\"title\":\"The Engineering and Mining Journal 1905-06-01: Vol 79 Iss 22\",\"date\":\"1905-06-01\"},{\"title\":\"The Engineering and Mining Journal 1910-02-12: Vol 89 Iss 7\",\"date\":\"1910-02-12\"},{\"title\":\"The Engineering and Mining Journal 1911-07-01: Vol 92 Iss 1\",\"date\":\"1911-07-01\"},{\"title\":\"The Engineering and Mining Journal 1906-02-24: Vol 81 Iss 8\",\"date\":\"1906-02-24\"},{\"title\":\"The Engineering and Mining Journal 1906-04-28: Vol 81 Iss 17\",\"date\":\"1906-04-28\"},{\"title\":\"The Engineering and Mining Journal 1906-09-22: Vol 82 Iss 12\",\"date\":\"1906-09-22\"},{\"title\":\"The Engineering and Mining Journal 1907-03-09: Vol 83 Iss 10\",\"date\":\"1907-03-09\"},{\"title\":\"The Engineering and Mining Journal 1908-06-06: Vol 85 Iss 23\",\"date\":\"1908-06-06\"},{\"title\":\"The Engineering and Mining Journal 1914-03-21: Vol 97 Iss 12\",\"date\":\"1914-03-21\"},{\"title\":\"The Engineering and Mining Journal 1914-11-14: Vol 98 Iss 20\",\"date\":\"1914-11-14\"},{\"title\":\"The Engineering and Mining Journal 1915-02-06: Vol 99 Iss 6\",\"date\":\"1915-02-06\"},{\"title\":\"The Engineering and Mining Journal 1915-08-21: Vol 100 Iss 8\",\"date\":\"1915-08-21\"},{\"title\":\"Engineering and Mining Journal 1916-11-04: Vol 102 Iss 19\",\"date\":\"1916-11-04\"},{\"title\":\"Engineering and Mining Journal 1916-11-25: Vol 102 Iss 22\",\"date\":\"1916-11-25\"},{\"title\":\"Engineering and Mining Journal 1920-01-31: Vol 109 Iss 5\",\"date\":\"1920-01-31\"},{\"title\":\"Engineering and Mining Journal 1920-08-28: Vol 110 Iss 9\",\"date\":\"1920-08-28\"},{\"title\":\"Engineering and Mining Journal 1920-12-18: Vol 110 Iss 25\",\"date\":\"1920-12-18\"},{\"title\":\"Engineering and Mining Journal-Press 1922-06-24: Vol 113 Iss 25\",\"date\":\"1922-06-24\"},{\"title\":\"Engineering and Mining Journal-Press 1922-07-08: Vol 114 Iss 2\",\"date\":\"1922-07-08\"},{\"title\":\"Engineering and Mining Journal-Press 1923-03-03: Vol 115 Iss 9\",\"date\":\"1923-03-03\"},{\"title\":\"Engineering and Mining Journal-Press 1924-01-12: Vol 117 Iss 2\",\"date\":\"1924-01-12\"},{\"title\":\"Engineering and Mining Journal-Press 1925-02-21: Vol 119 Iss 8\",\"date\":\"1925-02-21\"},{\"title\":\"Engineering and Mining Journal-Press 1925-11-21: Vol 120 Iss 21\",\"date\":\"1925-11-21\"},{\"title\":\"Engineering and Mining Journal 1926-10-16: Vol 122 Iss 16\",\"date\":\"1926-10-16\"},{\"title\":\"Engineering and Mining Journal 1928-03-10: Vol 125 Iss 10\",\"date\":\"1928-03-10\"},{\"title\":\"Engineering and Mining Journal 1928-08-04: Vol 126 Iss 5\",\"date\":\"1928-08-04\"},{\"title\":\"Engineering and Mining Journal 1928-10-20: Vol 126 Iss 16\",\"date\":\"1928-10-20\"},{\"title\":\"Engineering and Mining Journal 1928-12-01: Vol 126 Iss 22\",\"date\":\"1928-12-01\"},{\"title\":\"Engineering and Mining Journal 1929-06-22: Vol 127 Iss 25\",\"date\":\"1929-06-22\"},{\"title\":\"Engineering and Mining Journal 1930: Vol 130 Index\",\"date\":\"1930-01-01\"},{\"title\":\"Engineering and Mining Journal 1931-02-23: Vol 131 Iss 4\",\"date\":\"1931-02-23\"},{\"title\":\"Engineering and Mining Journal 1933-06: Vol 134 Iss 6\",\"date\":\"1933-06-01\"},{\"title\":\"Engineering and Mining Journal 1934-06: Vol 135 Iss 6\",\"date\":\"1934-06-01\"},{\"title\":\"Engineering and Mining Journal 1939-02: Vol 140 Iss 2\",\"date\":\"1939-02-01\"},{\"title\":\"Engineering and Mining Journal 1941-05: Vol 142 Iss 5\",\"date\":\"1941-05-01\"},{\"title\":\"Engineering and Mining Journal 1942-07: Vol 143 Iss 7\",\"date\":\"1942-07-01\"},{\"title\":\"Engineering and Mining Journal 1942-09: Vol 143 Iss 9\",\"date\":\"1942-09-01\"},{\"title\":\"Engineering and Mining Journal 1946-09: Vol 147 Iss 9\",\"date\":\"1946-09-01\"},{\"title\":\"Engineering and Mining Journal 1948-03: Vol 149 Iss 3\",\"date\":\"1948-03-01\"},{\"title\":\"Engineering and Mining Journal 1948-04: Vol 149 Iss 4\",\"date\":\"1948-04-01\"},{\"title\":\"Engineering and Mining Journal 1948-11: Vol 149 Iss 11\",\"date\":\"1948-11-01\"},{\"title\":\"Engineering and Mining Journal 1949-10: Vol 150 Iss 10\",\"date\":\"1949-10-01\"},{\"title\":\"Engineering and Mining Journal 1950-10: Vol 151 Iss 10\",\"date\":\"1950-10-01\"},{\"title\":\"Engineering and Mining Journal 1952-10: Vol 153 Iss 10\",\"date\":\"1952-10-01\"},{\"title\":\"Engineering and Mining Journal 1959-06: Vol 160 Iss 6\",\"date\":\"1959-06-01\"},{\"title\":\"Engineering and Mining Journal January 1-June 30, 1919: Vol 107 Index\",\"date\":\"1919-01-01\"},{\"title\":\"Engineering and Mining Journal January-December 1939: Vol 140 Index\",\"date\":\"1939-01-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1897: Vol 64 Index\",\"date\":\"1897-07-01\"},{\"title\":\"American Journal of Mining 1866-06-09: Vol 1 Iss 11\",\"date\":\"1866-06-09\"},{\"title\":\"The Engineering and Mining Journal 1870-09-06: Vol 10 Iss 10\",\"date\":\"1870-09-06\"},{\"title\":\"The Engineering and Mining Journal 1874-02-07: Vol 17 Iss 6\",\"date\":\"1874-02-07\"},{\"title\":\"The Engineering and Mining Journal 1882-10-07: Vol 34 Iss 15\",\"date\":\"1882-10-07\"},{\"title\":\"The Engineering and Mining Journal 1891-07-18: Vol 52 Iss 3\",\"date\":\"1891-07-18\"},{\"title\":\"The Engineering and Mining Journal 1891-08-15: Vol 52 Iss 7\",\"date\":\"1891-08-15\"},{\"title\":\"The Engineering and Mining Journal 1898-12-31: Vol 66 Iss 27\",\"date\":\"1898-12-31\"},{\"title\":\"The Engineering and Mining Journal 1899-01-14: Vol 67 Iss 2\",\"date\":\"1899-01-14\"},{\"title\":\"The Engineering and Mining Journal 1898-04-16: Vol 65 Iss 16\",\"date\":\"1898-04-16\"},{\"title\":\"The Engineering and Mining Journal 1910-06-18: Vol 89 Iss 25\",\"date\":\"1910-06-18\"},{\"title\":\"The Engineering and Mining Journal 1903-10-24: Vol 76 Iss 17\",\"date\":\"1903-10-24\"},{\"title\":\"The Engineering and Mining Journal 1912-05-25: Vol 93 Iss 21\",\"date\":\"1912-05-25\"},{\"title\":\"The Engineering and Mining Journal 1912-02-04: Vol 93 Iss 5\",\"date\":\"1912-02-04\"},{\"title\":\"Engineering and Mining Journal 1918-12-07: Vol 106 Iss 23\",\"date\":\"1918-12-07\"},{\"title\":\"Engineering and Mining Journal-Press 1925-01-17: Vol 119 Iss 3\",\"date\":\"1925-01-17\"},{\"title\":\"Engineering and Mining Journal-Press 1925-01-24: Vol 119 Iss 4\",\"date\":\"1925-01-24\"},{\"title\":\"Engineering and Mining Journal-Press 1922-09-02: Vol 114 Iss 10\",\"date\":\"1922-09-02\"},{\"title\":\"Engineering and Mining Journal 1941-07: Vol 142 Iss 7\",\"date\":\"1941-07-01\"},{\"title\":\"The Engineering and Mining Journal 1888-12-15: Vol 46 Iss 24\",\"date\":\"1888-12-15\"},{\"title\":\"The Engineering and Mining Journal 1885-10-10: Vol 40 Iss 15\",\"date\":\"1885-10-10\"},{\"title\":\"The Engineering and Mining Journal 1885-11-14: Vol 40 Iss 20\",\"date\":\"1885-11-14\"},{\"title\":\"The Engineering and Mining Journal 1886-03-13: Vol 41 Iss 11\",\"date\":\"1886-03-13\"},{\"title\":\"The Engineering and Mining Journal 1886-08-28: Vol 42 Iss 9\",\"date\":\"1886-08-28\"},{\"title\":\"The Engineering and Mining Journal 1893-01-14: Vol 55 Iss 2\",\"date\":\"1893-01-14\"},{\"title\":\"The Engineering and Mining Journal 1893-01-28: Vol 55 Iss 4\",\"date\":\"1893-01-28\"},{\"title\":\"The Engineering and Mining Journal 1888-09-08: Vol 46 Iss 10\",\"date\":\"1888-09-08\"},{\"title\":\"The Engineering and Mining Journal 1895-04-13: Vol 59 Iss 15\",\"date\":\"1895-04-13\"},{\"title\":\"The Engineering and Mining Journal 1892-01-23: Vol 53 Iss 4\",\"date\":\"1892-01-23\"},{\"title\":\"The Engineering and Mining Journal 1900-07-07: Vol 70 Iss 1\",\"date\":\"1900-07-07\"},{\"title\":\"The Engineering and Mining Journal 1900-04-07: Vol 69 Iss 14\",\"date\":\"1900-04-07\"},{\"title\":\"The Engineering and Mining Journal 1909-10-30: Vol 88 Iss 18\",\"date\":\"1909-10-30\"},{\"title\":\"Engineering and Mining Journal 1917-03-10: Vol 103 Iss 10\",\"date\":\"1917-03-10\"},{\"title\":\"Engineering and Mining Journal-Press 1924-07-19: Vol 118 Iss 3\",\"date\":\"1924-07-19\"},{\"title\":\"Engineering and Mining Journal-Press 1926-04-17: Vol 121 Iss 16\",\"date\":\"1926-04-17\"},{\"title\":\"The Engineering and Mining Journal 1876-07-22: Vol 22 Iss 4\",\"date\":\"1876-07-22\"},{\"title\":\"The Engineering and Mining Journal 1877-08-11: Vol 24 Iss 6\",\"date\":\"1877-08-11\"},{\"title\":\"The Engineering and Mining Journal 1877-11-24: Vol 24 Iss 21\",\"date\":\"1877-11-24\"},{\"title\":\"The Engineering and Mining Journal 1878-06-08: Vol 25 Iss 23\",\"date\":\"1878-06-08\"},{\"title\":\"The Engineering and Mining Journal 1878-06-29: Vol 25 Iss 26\",\"date\":\"1878-06-29\"},{\"title\":\"The Engineering and Mining Journal 1879-01-18: Vol 27 Iss 3\",\"date\":\"1879-01-18\"},{\"title\":\"The Engineering and Mining Journal 1886-12-04: Vol 42 Iss 23\",\"date\":\"1886-12-04\"},{\"title\":\"The Engineering and Mining Journal 1887-08-20: Vol 44 Iss 8\",\"date\":\"1887-08-20\"},{\"title\":\"The Engineering and Mining Journal 1885-10-31: Vol 40 Iss 18\",\"date\":\"1885-10-31\"},{\"title\":\"The Engineering and Mining Journal 1889-10-12: Vol 48 Iss 15\",\"date\":\"1889-10-12\"},{\"title\":\"The Engineering and Mining Journal 1890-05-03: Vol 49 Iss 18\",\"date\":\"1890-05-03\"},{\"title\":\"The Engineering and Mining Journal 1892-08-20: Vol 54 Iss 8\",\"date\":\"1892-08-20\"},{\"title\":\"The Engineering and Mining Journal 1891-08-01: Vol 52 Iss 5\",\"date\":\"1891-08-01\"},{\"title\":\"The Engineering and Mining Journal 1897-10-30: Vol 64 Iss 18\",\"date\":\"1897-10-30\"},{\"title\":\"The Engineering and Mining Journal 1893-02-04: Vol 55 Iss 5\",\"date\":\"1893-02-04\"},{\"title\":\"The Engineering and Mining Journal 1893-08-05: Vol 56 Iss 6\",\"date\":\"1893-08-05\"},{\"title\":\"The Engineering and Mining Journal 1893-09-23: Vol 56 Iss 13\",\"date\":\"1893-09-23\"},{\"title\":\"The Engineering and Mining Journal 1894-01-20: Vol 57 Iss 3\",\"date\":\"1894-01-20\"},{\"title\":\"The Engineering and Mining Journal 1896-06-13: Vol 61 Iss 24\",\"date\":\"1896-06-13\"},{\"title\":\"The Engineering and Mining Journal 1896-07-25: Vol 62 Iss 4\",\"date\":\"1896-07-25\"},{\"title\":\"The Engineering and Mining Journal 1896-09-26: Vol 62 Iss 13\",\"date\":\"1896-09-26\"},{\"title\":\"The Engineering and Mining Journal 1898-06-18: Vol 65 Iss 25\",\"date\":\"1898-06-18\"},{\"title\":\"The Engineering and Mining Journal 1899-03-18: Vol 67 Iss 11\",\"date\":\"1899-03-18\"},{\"title\":\"The Engineering and Mining Journal 1905-10-14: Vol 80 Iss 15\",\"date\":\"1905-10-14\"},{\"title\":\"The Engineering and Mining Journal 1906-01-06: Vol 81 Iss 1\",\"date\":\"1906-01-06\"},{\"title\":\"The Engineering and Mining Journal 1906-06-16: Vol 81 Iss 24\",\"date\":\"1906-06-16\"},{\"title\":\"The Engineering and Mining Journal 1908-02-22: Vol 85 Iss 8\",\"date\":\"1908-02-22\"},{\"title\":\"The Engineering and Mining Journal 1904-12-29: Vol 78 Iss 26\",\"date\":\"1904-12-29\"},{\"title\":\"The Engineering and Mining Journal 1905-01-05: Vol 79 Iss 1\",\"date\":\"1905-01-05\"},{\"title\":\"The Engineering and Mining Journal 1905-03-23: Vol 79 Iss 12\",\"date\":\"1905-03-23\"},{\"title\":\"The Engineering and Mining Journal 1913-06-14: Vol 95 Iss 24\",\"date\":\"1913-06-14\"},{\"title\":\"The Engineering and Mining Journal 1913-10-18: Vol 96 Iss 16\",\"date\":\"1913-10-18\"},{\"title\":\"The Engineering and Mining Journal 1914-06-27: Vol 97 Iss 26\",\"date\":\"1914-06-27\"},{\"title\":\"The Engineering and Mining Journal 1915-02-20: Vol 99 Iss 8\",\"date\":\"1915-02-20\"},{\"title\":\"Engineering and Mining Journal 1917-06-02: Vol 103 Iss 22\",\"date\":\"1917-06-02\"},{\"title\":\"Engineering and Mining Journal 1917-10-13: Vol 104 Iss 15\",\"date\":\"1917-10-13\"},{\"title\":\"Engineering and Mining Journal 1918-02-02: Vol 105 Iss 5\",\"date\":\"1918-02-02\"},{\"title\":\"Engineering and Mining Journal 1921-01-08: Vol 111 Iss 2\",\"date\":\"1921-01-08\"},{\"title\":\"Engineering and Mining Journal-Press 1923-03-31: Vol 115 Iss 13\",\"date\":\"1923-03-31\"},{\"title\":\"Engineering and Mining Journal-Press 1924-12-13: Vol 118 Iss 24\",\"date\":\"1924-12-13\"},{\"title\":\"Engineering and Mining Journal-Press 1925-04-11: Vol 119 Iss 15\",\"date\":\"1925-04-11\"},{\"title\":\"Engineering and Mining Journal-Press 1925-10-24: Vol 120 Iss 17\",\"date\":\"1925-10-24\"},{\"title\":\"Engineering and Mining Journal-Press 1925-10-31: Vol 120 Iss 18\",\"date\":\"1925-10-31\"},{\"title\":\"Engineering and Mining Journal-Press 1925-11-07: Vol 120 Iss 19\",\"date\":\"1925-11-07\"},{\"title\":\"Engineering and Mining Journal-Press 1926-06-12: Vol 121 Iss 24\",\"date\":\"1926-06-12\"},{\"title\":\"Engineering and Mining Journal 1953-06: Vol 154 Iss 6\",\"date\":\"1953-06-01\"},{\"title\":\"Engineering and Mining Journal 1944-12: Vol 145 Iss 12\",\"date\":\"1944-12-01\"},{\"title\":\"Engineering and Mining Journal 1945-10: Vol 146 Iss 10\",\"date\":\"1945-10-01\"},{\"title\":\"Engineering and Mining Journal January-December 1966: Vol 167 Index\",\"date\":\"1966-01-01\"},{\"title\":\"Engineering and Mining Journal 1956-06: Vol 157 Iss 6\",\"date\":\"1956-06-01\"},{\"title\":\"American Journal of Mining 1868-02-15: Vol 5 Iss 7\",\"date\":\"1868-02-15\"},{\"title\":\"American Journal of Mining 1868-08-22: Vol 6 Iss 8\",\"date\":\"1868-08-22\"},{\"title\":\"The Engineering and Mining Journal 1870-01-04: Vol 9 Iss 1\",\"date\":\"1870-01-04\"},{\"title\":\"The Engineering and Mining Journal 1870-07-26: Vol 10 Iss 4\",\"date\":\"1870-07-26\"},{\"title\":\"The Engineering and Mining Journal 1872-10-22: Vol 14 Iss 17\",\"date\":\"1872-10-22\"},{\"title\":\"The Engineering and Mining Journal 1874-11-14: Vol 18 Iss 20\",\"date\":\"1874-11-14\"},{\"title\":\"The Engineering and Mining Journal 1875-08-28: Vol 20 Iss 9\",\"date\":\"1875-08-28\"},{\"title\":\"The Engineering and Mining Journal 1875-10-30: Vol 20 Iss 18\",\"date\":\"1875-10-30\"},{\"title\":\"The Engineering and Mining Journal 1876-02-19: Vol 21 Iss 8\",\"date\":\"1876-02-19\"},{\"title\":\"The Engineering and Mining Journal 1873-09-02: Vol 16 Iss 10\",\"date\":\"1873-09-02\"},{\"title\":\"The Engineering and Mining Journal 1874-02-14: Vol 17 Iss 7\",\"date\":\"1874-02-14\"},{\"title\":\"The Engineering and Mining Journal 1874-02-28: Vol 17 Iss 9\",\"date\":\"1874-02-28\"},{\"title\":\"The Engineering and Mining Journal 1874-05-09: Vol 17 Iss 19\",\"date\":\"1874-05-09\"},{\"title\":\"The Engineering and Mining Journal 1885-01-17: Vol 39 Iss 3\",\"date\":\"1885-01-17\"},{\"title\":\"The Engineering and Mining Journal 1883-04-14: Vol 35 Iss 15\",\"date\":\"1883-04-14\"},{\"title\":\"The Engineering and Mining Journal 1883-09-08: Vol 36 Iss 10\",\"date\":\"1883-09-08\"},{\"title\":\"The Engineering and Mining Journal 1882-06-24: Vol 33 Iss 25\",\"date\":\"1882-06-24\"},{\"title\":\"The Engineering and Mining Journal 1882-08-05: Vol 34 Iss 6\",\"date\":\"1882-08-05\"},{\"title\":\"The Engineering and Mining Journal 1888-12-29: Vol 46 Iss 26\",\"date\":\"1888-12-29\"},{\"title\":\"The Engineering and Mining Journal 1894-06-23: Vol 57 Iss 25\",\"date\":\"1894-06-23\"},{\"title\":\"The Engineering and Mining Journal 1894-11-17: Vol 58 Iss 20\",\"date\":\"1894-11-17\"},{\"title\":\"The Engineering and Mining Journal 1895-02-02: Vol 59 Iss 5\",\"date\":\"1895-02-02\"},{\"title\":\"The Engineering and Mining Journal 1895-09-07: Vol 60 Iss 10\",\"date\":\"1895-09-07\"},{\"title\":\"The Engineering and Mining Journal 1895-09-21: Vol 60 Iss 12\",\"date\":\"1895-09-21\"},{\"title\":\"The Engineering and Mining Journal 1902-12-20: Vol 74 Iss 25\",\"date\":\"1902-12-20\"},{\"title\":\"The Engineering and Mining Journal 1901-08-31: Vol 72 Iss 9\",\"date\":\"1901-08-31\"},{\"title\":\"The Engineering and Mining Journal 1904-03-03: Vol 77 Iss 9\",\"date\":\"1904-03-03\"},{\"title\":\"The Engineering and Mining Journal 1904-03-24: Vol 77 Iss 12\",\"date\":\"1904-03-24\"},{\"title\":\"The Engineering and Mining Journal 1904-04-21: Vol 77 Iss 16\",\"date\":\"1904-04-21\"},{\"title\":\"The Engineering and Mining Journal 1904-05-26: Vol 77 Iss 21\",\"date\":\"1904-05-26\"},{\"title\":\"The Engineering and Mining Journal 1909-05-15: Vol 87 Iss 20\",\"date\":\"1909-05-15\"},{\"title\":\"The Engineering and Mining Journal 1910-12-24: Vol 90 Iss 26\",\"date\":\"1910-12-24\"},{\"title\":\"The Engineering and Mining Journal 1909-10-16: Vol 88 Iss 16\",\"date\":\"1909-10-16\"},{\"title\":\"The Engineering and Mining Journal 1910-03-05: Vol 89 Iss 10\",\"date\":\"1910-03-05\"},{\"title\":\"The Engineering and Mining Journal 1910-07-30: Vol 90 Iss 5\",\"date\":\"1910-07-30\"},{\"title\":\"Engineering and Mining Journal 1918-12-28: Vol 106 Iss 26\",\"date\":\"1918-12-28\"},{\"title\":\"Engineering and Mining Journal 1919-01-11: Vol 107 Iss 2\",\"date\":\"1919-01-11\"},{\"title\":\"Engineering and Mining Journal 1919-09-13: Vol 108 Iss 11\",\"date\":\"1919-09-13\"},{\"title\":\"Engineering and Mining Journal 1920-01-24: Vol 109 Iss 4\",\"date\":\"1920-01-24\"},{\"title\":\"Engineering and Mining Journal 1920-02-07: Vol 109 Iss 6\",\"date\":\"1920-02-07\"},{\"title\":\"Engineering and Mining Journal 1922-02-11: Vol 113 Iss 6\",\"date\":\"1922-02-11\"},{\"title\":\"Engineering and Mining Journal 1928-07-14: Vol 126 Iss 2\",\"date\":\"1928-07-14\"},{\"title\":\"Engineering and Mining Journal 1928-08-11: Vol 126 Iss 6\",\"date\":\"1928-08-11\"},{\"title\":\"American Journal of Mining 1867-07-27: Vol 4 Iss 4\",\"date\":\"1867-07-27\"},{\"title\":\"American Journal of Mining 1867-10-05: Vol 4 Iss 14\",\"date\":\"1867-10-05\"},{\"title\":\"American Journal of Mining 1867-12-07: Vol 4 Iss 23\",\"date\":\"1867-12-07\"},{\"title\":\"American Journal of Mining 1868-05-30: Vol 5 Iss 22\",\"date\":\"1868-05-30\"},{\"title\":\"American Journal of Mining 1868-09-26: Vol 6 Iss 13\",\"date\":\"1868-09-26\"},{\"title\":\"The Engineering and Mining Journal 1877-08-25: Vol 24 Iss 8\",\"date\":\"1877-08-25\"},{\"title\":\"The Engineering and Mining Journal 1874-11-07: Vol 18 Iss 19\",\"date\":\"1874-11-07\"},{\"title\":\"The Engineering and Mining Journal 1880-09-25: Vol 30 Iss 13\",\"date\":\"1880-09-25\"},{\"title\":\"The Engineering and Mining Journal 1882-10-21: Vol 34 Iss 17\",\"date\":\"1882-10-21\"},{\"title\":\"The Engineering and Mining Journal 1891-12-12: Vol 52 Iss 24\",\"date\":\"1891-12-12\"},{\"title\":\"The Engineering and Mining Journal 1892-03-26: Vol 53 Iss 13\",\"date\":\"1892-03-26\"},{\"title\":\"The Engineering and Mining Journal 1892-08-27: Vol 54 Iss 9\",\"date\":\"1892-08-27\"},{\"title\":\"The Engineering and Mining Journal 1892-12-17: Vol 54 Iss 25\",\"date\":\"1892-12-17\"},{\"title\":\"The Engineering and Mining Journal 1890-12-20: Vol 50 Iss 25\",\"date\":\"1890-12-20\"},{\"title\":\"The Engineering and Mining Journal 1893-01-21: Vol 55 Iss 3\",\"date\":\"1893-01-21\"},{\"title\":\"The Engineering and Mining Journal 1893-09-02: Vol 56 Iss 10\",\"date\":\"1893-09-02\"},{\"title\":\"The Engineering and Mining Journal 1894-04-14: Vol 57 Iss 15\",\"date\":\"1894-04-14\"},{\"title\":\"The Engineering and Mining Journal 1895-10-19: Vol 60 Iss 16\",\"date\":\"1895-10-19\"},{\"title\":\"The Engineering and Mining Journal 1899-09-30: Vol 68 Iss 14\",\"date\":\"1899-09-30\"},{\"title\":\"The Engineering and Mining Journal 1899-11-18: Vol 68 Iss 21\",\"date\":\"1899-11-18\"},{\"title\":\"The Engineering and Mining Journal 1900-02-10: Vol 69 Iss 6\",\"date\":\"1900-02-10\"},{\"title\":\"The Engineering and Mining Journal 1900-09-08: Vol 70 Iss 10\",\"date\":\"1900-09-08\"},{\"title\":\"The Engineering and Mining Journal 1905-10-21: Vol 80 Iss 16\",\"date\":\"1905-10-21\"},{\"title\":\"The Engineering and Mining Journal 1906-09-29: Vol 82 Iss 13\",\"date\":\"1906-09-29\"},{\"title\":\"The Engineering and Mining Journal 1903-06-27: Vol 75 Iss 26\",\"date\":\"1903-06-27\"},{\"title\":\"The Engineering and Mining Journal 1903-08-15: Vol 76 Iss 7\",\"date\":\"1903-08-15\"},{\"title\":\"The Engineering and Mining Journal 1903-10-17: Vol 76 Iss 16\",\"date\":\"1903-10-17\"},{\"title\":\"The Engineering and Mining Journal 1908-05-30: Vol 85 Iss 22\",\"date\":\"1908-05-30\"},{\"title\":\"The Engineering and Mining Journal 1908-06-27: Vol 85 Iss 26\",\"date\":\"1908-06-27\"},{\"title\":\"The Engineering and Mining Journal 1908-10-17: Vol 86 Iss 16\",\"date\":\"1908-10-17\"},{\"title\":\"The Engineering and Mining Journal 1911-03-04: Vol 91 Iss 9\",\"date\":\"1911-03-04\"},{\"title\":\"The Engineering and Mining Journal 1911-03-11: Vol 91 Iss 10\",\"date\":\"1911-03-11\"},{\"title\":\"The Engineering and Mining Journal 1910-02-05: Vol 89 Iss 6\",\"date\":\"1910-02-05\"},{\"title\":\"The Engineering and Mining Journal 1910-04-23: Vol 89 Iss 17\",\"date\":\"1910-04-23\"},{\"title\":\"The Engineering and Mining Journal 1910-06-04: Vol 89 Iss 23\",\"date\":\"1910-06-04\"},{\"title\":\"Engineering and Mining Journal 1917-01-13: Vol 103 Iss 2\",\"date\":\"1917-01-13\"},{\"title\":\"Engineering and Mining Journal 1917-02-03: Vol 103 Iss 5\",\"date\":\"1917-02-03\"},{\"title\":\"Engineering and Mining Journal 1917-03-03: Vol 103 Iss 9\",\"date\":\"1917-03-03\"},{\"title\":\"Engineering and Mining Journal 1920-06-12: Vol 109 Iss 24\",\"date\":\"1920-06-12\"},{\"title\":\"Engineering and Mining Journal 1920-08-07: Vol 110 Iss 6\",\"date\":\"1920-08-07\"},{\"title\":\"Engineering and Mining Journal-Press 1923-08-25: Vol 116 Iss 8\",\"date\":\"1923-08-25\"},{\"title\":\"Engineering and Mining Journal-Press 1924-05-24: Vol 117 Iss 21\",\"date\":\"1924-05-24\"},{\"title\":\"Engineering and Mining Journal-Press 1924-06-21: Vol 117 Iss 25\",\"date\":\"1924-06-21\"},{\"title\":\"Engineering and Mining Journal-Press 1925-02-28: Vol 119 Iss 9\",\"date\":\"1925-02-28\"},{\"title\":\"Engineering and Mining Journal-Press 1925-04-25: Vol 119 Iss 17\",\"date\":\"1925-04-25\"},{\"title\":\"Engineering and Mining Journal 1927-03-05: Vol 123 Iss 10\",\"date\":\"1927-03-05\"},{\"title\":\"Engineering and Mining Journal 1927-07-23: Vol 124 Iss 4\",\"date\":\"1927-07-23\"},{\"title\":\"Engineering and Mining Journal 1927-08-27: Vol 124 Iss 9\",\"date\":\"1927-08-27\"},{\"title\":\"Engineering and Mining Journal 1927-10-08: Vol 124 Iss 15\",\"date\":\"1927-10-08\"},{\"title\":\"Engineering and Mining Journal 1929-04-06: Vol 127 Iss 14\",\"date\":\"1929-04-06\"},{\"title\":\"Engineering and Mining Journal 1929-08-17: Vol 128 Iss 7\",\"date\":\"1929-08-17\"},{\"title\":\"Engineering and Mining Journal 1930-03-24: Vol 129 Iss 6\",\"date\":\"1930-03-24\"},{\"title\":\"Engineering and Mining Journal 1930-05-23: Vol 129 Iss 10\",\"date\":\"1930-05-23\"},{\"title\":\"Engineering and Mining Journal 1953-10: Vol 154 Iss 10\",\"date\":\"1953-10-01\"},{\"title\":\"Engineering and Mining Journal 1939-03: Vol 140 Iss 3\",\"date\":\"1939-03-01\"},{\"title\":\"Engineering and Mining Journal 1942-12: Vol 143 Iss 12\",\"date\":\"1942-12-01\"},{\"title\":\"Engineering and Mining Journal 1943-01: Vol 144 Iss 1\",\"date\":\"1943-01-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1908: Vol 86 Index\",\"date\":\"1908-07-01\"},{\"title\":\"The Engineering and Mining Journal July-Decemebr 1907: Vol 84 Index\",\"date\":\"1907-01-01\"},{\"title\":\"Engineering and Mining Journal November 22 and 29, 1919: Vol 108 Iss 20\",\"date\":\"1919-11-22\"},{\"title\":\"American Journal of Mining 1866-07-14: Vol 1 Iss 16\",\"date\":\"1866-07-14\"},{\"title\":\"The Engineering and Mining Journal 1871-08-15: Vol 12 Iss 7\",\"date\":\"1871-08-15\"},{\"title\":\"The Engineering and Mining Journal 1871-10-03: Vol 12 Iss 14\",\"date\":\"1871-10-03\"},{\"title\":\"The Engineering and Mining Journal 1879-01-25: Vol 27 Iss 4\",\"date\":\"1879-01-25\"},{\"title\":\"The Engineering and Mining Journal 1880-03-27: Vol 29 Iss 13\",\"date\":\"1880-03-27\"},{\"title\":\"The Engineering and Mining Journal 1884-06-28: Vol 37 Iss 26\",\"date\":\"1884-06-28\"},{\"title\":\"The Engineering and Mining Journal 1885-01-10: Vol 39 Iss 2\",\"date\":\"1885-01-10\"},{\"title\":\"The Engineering and Mining Journal 1886-09-25: Vol 42 Iss 13\",\"date\":\"1886-09-25\"},{\"title\":\"The Engineering and Mining Journal 1886-10-30: Vol 42 Iss 18\",\"date\":\"1886-10-30\"},{\"title\":\"The Engineering and Mining Journal 1885-04-18: Vol 39 Iss 16\",\"date\":\"1885-04-18\"},{\"title\":\"The Engineering and Mining Journal 1885-09-12: Vol 40 Iss 11\",\"date\":\"1885-09-12\"},{\"title\":\"The Engineering and Mining Journal 1889-10-19: Vol 48 Iss 16\",\"date\":\"1889-10-19\"},{\"title\":\"The Engineering and Mining Journal 1890-04-26: Vol 49 Iss 17\",\"date\":\"1890-04-26\"},{\"title\":\"The Engineering and Mining Journal 1897-03-06: Vol 63 Iss 10\",\"date\":\"1897-03-06\"},{\"title\":\"The Engineering and Mining Journal 1897-09-25: Vol 64 Iss 13\",\"date\":\"1897-09-25\"},{\"title\":\"The Engineering and Mining Journal 1897-11-13: Vol 64 Iss 20\",\"date\":\"1897-11-13\"},{\"title\":\"The Engineering and Mining Journal 1898-02-19: Vol 65 Iss 8\",\"date\":\"1898-02-19\"},{\"title\":\"The Engineering and Mining Journal 1902-03-22: Vol 73 Iss 12\",\"date\":\"1902-03-22\"},{\"title\":\"The Engineering and Mining Journal 1898-12-03: Vol 66 Iss 23\",\"date\":\"1898-12-03\"},{\"title\":\"The Engineering and Mining Journal 1901-02-02: Vol 71 Iss 5\",\"date\":\"1901-02-02\"},{\"title\":\"The Engineering and Mining Journal 1901-10-26: Vol 72 Iss 17\",\"date\":\"1901-10-26\"},{\"title\":\"The Engineering and Mining Journal 1902-01-11: Vol 73 Iss 2\",\"date\":\"1902-01-11\"},{\"title\":\"The Engineering and Mining Journal 1913-05-31: Vol 95 Iss 22\",\"date\":\"1913-05-31\"},{\"title\":\"The Engineering and Mining Journal 1913-08-09: Vol 96 Iss 6\",\"date\":\"1913-08-09\"},{\"title\":\"The Engineering and Mining Journal 1913-11-15: Vol 96 Iss 20\",\"date\":\"1913-11-15\"},{\"title\":\"The Engineering and Mining Journal 1914-07-25: Vol 98 Iss 4\",\"date\":\"1914-07-25\"},{\"title\":\"The Engineering and Mining Journal 1915-09-25: Vol 100 Iss 13\",\"date\":\"1915-09-25\"},{\"title\":\"The Engineering and Mining Journal 1916-01-01: Vol 101 Iss 1\",\"date\":\"1916-01-01\"},{\"title\":\"The Engineering and Mining Journal 1916-04-01: Vol 101 Iss 14\",\"date\":\"1916-04-01\"},{\"title\":\"The Engineering and Mining Journal 1916-04-22: Vol 101 Iss 17\",\"date\":\"1916-04-22\"},{\"title\":\"The Engineering and Mining Journal 1912-06-15: Vol 93 Iss 24\",\"date\":\"1912-06-15\"},{\"title\":\"The Engineering and Mining Journal 1912-07-13: Vol 94 Iss 2\",\"date\":\"1912-07-13\"},{\"title\":\"Engineering and Mining Journal 1918-11-02: Vol 106 Iss 18\",\"date\":\"1918-11-02\"},{\"title\":\"Engineering and Mining Journal 1918-11-09: Vol 106 Iss 19\",\"date\":\"1918-11-09\"},{\"title\":\"Engineering and Mining Journal 1919-03-08: Vol 107 Iss 10\",\"date\":\"1919-03-08\"},{\"title\":\"Engineering and Mining Journal 1921-12-03: Vol 112 Iss 23\",\"date\":\"1921-12-03\"},{\"title\":\"Engineering and Mining Journal 1921-12-31: Vol 112 Iss 27\",\"date\":\"1921-12-31\"},{\"title\":\"Engineering and Mining Journal 1922-02-18: Vol 113 Iss 7\",\"date\":\"1922-02-18\"},{\"title\":\"Engineering and Mining Journal 1922-02-25: Vol 113 Iss 8\",\"date\":\"1922-02-25\"},{\"title\":\"Engineering and Mining Journal-Press 1922-11-18: Vol 114 Iss 21\",\"date\":\"1922-11-18\"},{\"title\":\"Engineering and Mining Journal-Press 1923-01-20: Vol 115 Iss 3\",\"date\":\"1923-01-20\"},{\"title\":\"Engineering and Mining Journal-Press 1923-02-03: Vol 115 Iss 5\",\"date\":\"1923-02-03\"},{\"title\":\"Engineering and Mining Journal-Press 1923-02-24: Vol 115 Iss 8\",\"date\":\"1923-02-24\"},{\"title\":\"Engineering and Mining Journal 1928-03-17: Vol 125 Iss 11\",\"date\":\"1928-03-17\"},{\"title\":\"Engineering and Mining Journal 1928-12-29: Vol 126 Iss 26\",\"date\":\"1928-12-29\"},{\"title\":\"Engineering and Mining Journal 1934-09: Vol 135 Iss 9\",\"date\":\"1934-09-01\"},{\"title\":\"Engineering and Mining Journal 1936-05: Vol 137 Iss 5\",\"date\":\"1936-05-01\"},{\"title\":\"Engineering and Mining Journal 1959-10: Vol 160 Iss 10\",\"date\":\"1959-10-01\"},{\"title\":\"Engineering and Mining Journal 1945-05: Vol 146 Iss 5\",\"date\":\"1945-05-01\"},{\"title\":\"Engineering and Mining Journal 1947-05: Vol 148 Iss 5\",\"date\":\"1947-05-01\"},{\"title\":\"Engineering and Mining Journal 1954-07: Vol 155 Iss 7\",\"date\":\"1954-07-01\"},{\"title\":\"Engineering and Mining Journal 1955-11: Vol 156 Iss 11\",\"date\":\"1955-11-01\"},{\"title\":\"Engineering and Mining Journal 1956-08: Vol 157 Iss 8\",\"date\":\"1956-08-01\"},{\"title\":\"Engineering and Mining Journal 1956: Vol 157 Index\",\"date\":\"1956-01-01\"},{\"title\":\"The Engineering and Mining Journal 1902-12-13: Vol 74 Iss 24\",\"date\":\"1902-12-13\"},{\"title\":\"The Engineering and Mining Journal 1904-10-20: Vol 78 Iss 16\",\"date\":\"1904-10-20\"},{\"title\":\"The Engineering and Mining Journal 1904-12-01: Vol 78 Iss 22\",\"date\":\"1904-12-01\"},{\"title\":\"The Engineering and Mining Journal 1913-08-16: Vol 96 Iss 7\",\"date\":\"1913-08-16\"},{\"title\":\"Engineering and Mining Journal 1920-04-10: Vol 109 Iss 15\",\"date\":\"1920-04-10\"},{\"title\":\"Engineering and Mining Journal 1921-01-22: Vol 111 Iss 4\",\"date\":\"1921-01-22\"},{\"title\":\"Engineering and Mining Journal 1921-10-08: Vol 112 Iss 15\",\"date\":\"1921-10-08\"},{\"title\":\"Engineering and Mining Journal-Press 1923-10-27: Vol 116 Iss 17\",\"date\":\"1923-10-27\"},{\"title\":\"Engineering and Mining Journal-Press 1924-08-16: Vol 118 Iss 7\",\"date\":\"1924-08-16\"},{\"title\":\"Engineering and Mining Journal-Press 1924-08-23: Vol 118 Iss 8\",\"date\":\"1924-08-23\"},{\"title\":\"Engineering and Mining Journal-Press 1925-05-30: Vol 119 Iss 22\",\"date\":\"1925-05-30\"},{\"title\":\"Engineering and Mining Journal 1929-10-19: Vol 128 Iss 16\",\"date\":\"1929-10-19\"},{\"title\":\"Engineering and Mining Journal 1930-04-07: Vol 129 Iss 7\",\"date\":\"1930-04-07\"},{\"title\":\"Engineering and Mining Journal 1932-01: Vol 133 Iss 1\",\"date\":\"1932-01-01\"},{\"title\":\"Engineering and Mining Journal 1946-10: Vol 147 Iss 10\",\"date\":\"1946-10-01\"},{\"title\":\"Engineering and Mining Journal 1948-01: Vol 149 Iss 1\",\"date\":\"1948-01-01\"},{\"title\":\"Engineering and Mining Journal 1956-05: Vol 157 Iss 5\",\"date\":\"1956-05-01\"},{\"title\":\"Engineering and Mining Journal December 13 and 20, 1919: Vol 108 Iss 22\",\"date\":\"1919-12-13\"},{\"title\":\"American Journal of Mining October, 1866-March, 1867: Vol 2 Index\",\"date\":\"1866-10-01\"},{\"title\":\"The Engineering and Mining Journal 1883-11-03: Vol 36 Iss 18\",\"date\":\"1883-11-03\"},{\"title\":\"The Engineering and Mining Journal 1884-03-01: Vol 37 Iss 9\",\"date\":\"1884-03-01\"},{\"title\":\"The Engineering and Mining Journal 1884-07-26: Vol 38 Iss 4\",\"date\":\"1884-07-26\"},{\"title\":\"The Engineering and Mining Journal 1884-09-06: Vol 38 Iss 10\",\"date\":\"1884-09-06\"},{\"title\":\"The Engineering and Mining Journal 1885-08-15: Vol 40 Iss 7\",\"date\":\"1885-08-15\"},{\"title\":\"The Engineering and Mining Journal 1891-06-27: Vol 51 Iss 26\",\"date\":\"1891-06-27\"},{\"title\":\"The Engineering and Mining Journal 1891-09-12: Vol 52 Iss 11\",\"date\":\"1891-09-12\"},{\"title\":\"The Engineering and Mining Journal 1891-09-26: Vol 52 Iss 13\",\"date\":\"1891-09-26\"},{\"title\":\"The Engineering and Mining Journal 1891-11-21: Vol 52 Iss 21\",\"date\":\"1891-11-21\"},{\"title\":\"The Engineering and Mining Journal 1892-05-28: Vol 53 Iss 22\",\"date\":\"1892-05-28\"},{\"title\":\"The Engineering and Mining Journal 1892-09-24: Vol 54 Iss 13\",\"date\":\"1892-09-24\"},{\"title\":\"The Engineering and Mining Journal 1894-11-10: Vol 58 Iss 19\",\"date\":\"1894-11-10\"},{\"title\":\"The Engineering and Mining Journal 1895-01-19: Vol 59 Iss 3\",\"date\":\"1895-01-19\"},{\"title\":\"The Engineering and Mining Journal 1895-11-23: Vol 60 Iss 21\",\"date\":\"1895-11-23\"},{\"title\":\"The Engineering and Mining Journal 1896-02-15: Vol 61 Iss 7\",\"date\":\"1896-02-15\"},{\"title\":\"The Engineering and Mining Journal 1896-08-29: Vol 62 Iss 9\",\"date\":\"1896-08-29\"},{\"title\":\"The Engineering and Mining Journal 1896-10-24: Vol 62 Iss 17\",\"date\":\"1896-10-24\"},{\"title\":\"The Engineering and Mining Journal 1897-01-16: Vol 63 Iss 3\",\"date\":\"1897-01-16\"},{\"title\":\"The Engineering and Mining Journal 1897-02-06: Vol 63 Iss 6\",\"date\":\"1897-02-06\"},{\"title\":\"The Engineering and Mining Journal 1890-11-29: Vol 50 Iss 22\",\"date\":\"1890-11-29\"},{\"title\":\"The Engineering and Mining Journal 1899-11-11: Vol 68 Iss 20\",\"date\":\"1899-11-11\"},{\"title\":\"The Engineering and Mining Journal 1900-09-29: Vol 70 Iss 13\",\"date\":\"1900-09-29\"},{\"title\":\"The Engineering and Mining Journal 1909-12-11: Vol 88 Iss 24\",\"date\":\"1909-12-11\"},{\"title\":\"The Engineering and Mining Journal 1911-05-27: Vol 91 Iss 21\",\"date\":\"1911-05-27\"},{\"title\":\"The Engineering and Mining Journal 1912-04-20: Vol 93 Iss 16\",\"date\":\"1912-04-20\"},{\"title\":\"Engineering and Mining Journal 1917-12-22: Vol 104 Iss 25\",\"date\":\"1917-12-22\"},{\"title\":\"Engineering and Mining Journal 1918-07-13: Vol 106 Iss 2\",\"date\":\"1918-07-13\"},{\"title\":\"Engineering and Mining Journal-Press 1926-03-20: Vol 121 Iss 12\",\"date\":\"1926-03-20\"},{\"title\":\"Engineering and Mining Journal-Press 1926-05-15: Vol 121 Iss 20\",\"date\":\"1926-05-15\"},{\"title\":\"Engineering and Mining Journal 1928-11-10: Vol 126 Iss 19\",\"date\":\"1928-11-10\"},{\"title\":\"The Engineering and Mining Journal July - December 1898: Vol 66 Index\",\"date\":\"1898-07-01\"},{\"title\":\"American Journal of Mining 1867-08-03: Vol 4 Iss 5\",\"date\":\"1867-08-03\"},{\"title\":\"The Engineering and Mining Journal 1893-12-23: Vol 56 Iss 26\",\"date\":\"1893-12-23\"},{\"title\":\"The Engineering and Mining Journal 1905-01-26: Vol 79 Iss 4\",\"date\":\"1905-01-26\"},{\"title\":\"The Engineering and Mining Journal 1911-08-19: Vol 92 Iss 8\",\"date\":\"1911-08-19\"},{\"title\":\"Engineering and Mining Journal 1917-12-01: Vol 104 Iss 22\",\"date\":\"1917-12-01\"},{\"title\":\"Engineering and Mining Journal 1928-06-23: Vol 125 Iss 25\",\"date\":\"1928-06-23\"},{\"title\":\"The Engineering and Mining Journal January-June 1909: Vol 87 Index\",\"date\":\"1909-01-01\"},{\"title\":\"The Engineering and Mining Journal 1869-12-21: Vol 8 Iss 25\",\"date\":\"1869-12-21\"},{\"title\":\"American Journal of Mining 1868-05-02: Vol 5 Iss 18\",\"date\":\"1868-05-02\"},{\"title\":\"The Engineering and Mining Journal 1875-03-13: Vol 19 Iss 11\",\"date\":\"1875-03-13\"},{\"title\":\"The Engineering and Mining Journal 1890-02-15: Vol 49 Iss 7\",\"date\":\"1890-02-15\"},{\"title\":\"The Engineering and Mining Journal 1887-12-24: Vol 44 Iss 26\",\"date\":\"1887-12-24\"},{\"title\":\"The Engineering and Mining Journal 1899-04-15: Vol 67 Iss 15\",\"date\":\"1899-04-15\"},{\"title\":\"The Engineering and Mining Journal 1902-06-28: Vol 73 Iss 26\",\"date\":\"1902-06-28\"},{\"title\":\"The Engineering and Mining Journal 1908-09-05: Vol 86 Iss 10\",\"date\":\"1908-09-05\"},{\"title\":\"The Engineering and Mining Journal 1908-02-01: Vol 85 Iss 5\",\"date\":\"1908-02-01\"},{\"title\":\"Engineering and Mining Journal 1931-07-27: Vol 132 Iss 2\",\"date\":\"1931-07-27\"},{\"title\":\"American Journal of Mining 1866-09-01: Vol 1 Iss 23\",\"date\":\"1866-09-01\"},{\"title\":\"The Engineering and Mining Journal 1869-09-28: Vol 8 Iss 13\",\"date\":\"1869-09-28\"},{\"title\":\"The Engineering and Mining Journal 1871-03-28: Vol 11 Iss 13\",\"date\":\"1871-03-28\"},{\"title\":\"The Engineering and Mining Journal 1875-10-23: Vol 20 Iss 17\",\"date\":\"1875-10-23\"},{\"title\":\"The Engineering and Mining Journal 1877-12-15: Vol 24 Iss 24\",\"date\":\"1877-12-15\"},{\"title\":\"The Engineering and Mining Journal 1876-11-25: Vol 22 Iss 22\",\"date\":\"1876-11-25\"},{\"title\":\"The Engineering and Mining Journal 1876-10-28: Vol 22 Iss 18\",\"date\":\"1876-10-28\"},{\"title\":\"The Engineering and Mining Journal 1889-04-27: Vol 47 Iss 17\",\"date\":\"1889-04-27\"},{\"title\":\"The Engineering and Mining Journal 1893-06-03: Vol 55 Iss 22\",\"date\":\"1893-06-03\"},{\"title\":\"The Engineering and Mining Journal 1894-03-24: Vol 57 Iss 12\",\"date\":\"1894-03-24\"},{\"title\":\"The Engineering and Mining Journal 1894-08-04: Vol 58 Iss 5\",\"date\":\"1894-08-04\"},{\"title\":\"The Engineering and Mining Journal 1901-07-27: Vol 72 Iss 4\",\"date\":\"1901-07-27\"},{\"title\":\"The Engineering and Mining Journal 1901-11-02: Vol 72 Iss 18\",\"date\":\"1901-11-02\"},{\"title\":\"The Engineering and Mining Journal 1916-03-18: Vol 101 Iss 12\",\"date\":\"1916-03-18\"},{\"title\":\"The Engineering and Mining Journal 1911-09-16: Vol 92 Iss 12\",\"date\":\"1911-09-16\"},{\"title\":\"Engineering and Mining Journal 1917-08-25: Vol 104 Iss 8\",\"date\":\"1917-08-25\"},{\"title\":\"Engineering and Mining Journal 1922-02-04: Vol 113 Iss 5\",\"date\":\"1922-02-04\"},{\"title\":\"Engineering and Mining Journal-Press 1922-08-26: Vol 114 Iss 9\",\"date\":\"1922-08-26\"},{\"title\":\"Engineering and Mining Journal 1928-06-30: Vol 125 Iss 26\",\"date\":\"1928-06-30\"},{\"title\":\"Engineering and Mining Journal 1928-10-27: Vol 126 Iss 17\",\"date\":\"1928-10-27\"},{\"title\":\"Engineering and Mining Journal 1928-06-02: Vol 125 Iss 22\",\"date\":\"1928-06-02\"},{\"title\":\"Engineering and Mining Journal 1950-03: Vol 151 Iss 3\",\"date\":\"1950-03-01\"},{\"title\":\"The Engineering and Mining Journal 1872-02-13: Vol 13 Iss 7\",\"date\":\"1872-02-13\"},{\"title\":\"The Engineering and Mining Journal 1883-11-10: Vol 36 Iss 19\",\"date\":\"1883-11-10\"},{\"title\":\"The Engineering and Mining Journal 1890-01-11: Vol 49 Iss 2\",\"date\":\"1890-01-11\"},{\"title\":\"The Engineering and Mining Journal 1899-03-25: Vol 67 Iss 12\",\"date\":\"1899-03-25\"},{\"title\":\"The Engineering and Mining Journal 1905-01-19: Vol 79 Iss 3\",\"date\":\"1905-01-19\"},{\"title\":\"The Engineering and Mining Journal 1906-05-19: Vol 81 Iss 20\",\"date\":\"1906-05-19\"},{\"title\":\"The Engineering and Mining Journal 1909-03-20: Vol 87 Iss 12\",\"date\":\"1909-03-20\"},{\"title\":\"The Engineering and Mining Journal 1905-11-04: Vol 80 Iss 18\",\"date\":\"1905-11-04\"},{\"title\":\"The Engineering and Mining Journal 1912-05-11: Vol 93 Iss 19\",\"date\":\"1912-05-11\"},{\"title\":\"The Engineering and Mining Journal 1883-10-13: Vol 36 Iss 15\",\"date\":\"1883-10-13\"},{\"title\":\"American Journal of Mining 1868-05-16: Vol 5 Iss 20\",\"date\":\"1868-05-16\"},{\"title\":\"The Engineering and Mining Journal 1872-10-29: Vol 14 Iss 18\",\"date\":\"1872-10-29\"},{\"title\":\"The Engineering and Mining Journal 1873-11-18: Vol 16 Iss 21\",\"date\":\"1873-11-18\"},{\"title\":\"The Engineering and Mining Journal 1874-10-24: Vol 18 Iss 17\",\"date\":\"1874-10-24\"},{\"title\":\"The Engineering and Mining Journal 1875-01-23: Vol 19 Iss 4\",\"date\":\"1875-01-23\"},{\"title\":\"The Engineering and Mining Journal 1880-05-15: Vol 29 Iss 20\",\"date\":\"1880-05-15\"},{\"title\":\"The Engineering and Mining Journal 1880-07-03: Vol 30 Iss 1\",\"date\":\"1880-07-03\"},{\"title\":\"The Engineering and Mining Journal 1881-04-30: Vol 31 Iss 18\",\"date\":\"1881-04-30\"},{\"title\":\"The Engineering and Mining Journal 1881-07-16: Vol 32 Iss 3\",\"date\":\"1881-07-16\"},{\"title\":\"The Engineering and Mining Journal 1881-12-17: Vol 32 Iss 25\",\"date\":\"1881-12-17\"},{\"title\":\"The Engineering and Mining Journal 1886-01-30: Vol 41 Iss 5\",\"date\":\"1886-01-30\"},{\"title\":\"The Engineering and Mining Journal 1886-04-03: Vol 41 Iss 14\",\"date\":\"1886-04-03\"},{\"title\":\"The Engineering and Mining Journal 1886-04-17: Vol 41 Iss 16\",\"date\":\"1886-04-17\"},{\"title\":\"The Engineering and Mining Journal 1886-07-31: Vol 42 Iss 5\",\"date\":\"1886-07-31\"},{\"title\":\"The Engineering and Mining Journal 1891-10-17: Vol 52 Iss 16\",\"date\":\"1891-10-17\"},{\"title\":\"The Engineering and Mining Journal 1892-01-16: Vol 53 Iss 3\",\"date\":\"1892-01-16\"},{\"title\":\"The Engineering and Mining Journal 1892-11-26: Vol 54 Iss 22\",\"date\":\"1892-11-26\"},{\"title\":\"The Engineering and Mining Journal 1890-02-01: Vol 49 Iss 5\",\"date\":\"1890-02-01\"},{\"title\":\"The Engineering and Mining Journal 1890-05-31: Vol 49 Iss 22\",\"date\":\"1890-05-31\"},{\"title\":\"The Engineering and Mining Journal 1899-03-04: Vol 67 Iss 9\",\"date\":\"1899-03-04\"},{\"title\":\"The Engineering and Mining Journal 1899-04-29: Vol 67 Iss 17\",\"date\":\"1899-04-29\"},{\"title\":\"The Engineering and Mining Journal 1904-03-17: Vol 77 Iss 11\",\"date\":\"1904-03-17\"},{\"title\":\"The Engineering and Mining Journal 1905-07-22: Vol 80 Iss 3\",\"date\":\"1905-07-22\"},{\"title\":\"The Engineering and Mining Journal 1905-09-02: Vol 80 Iss 9\",\"date\":\"1905-09-02\"},{\"title\":\"The Engineering and Mining Journal 1906-08-11: Vol 82 Iss 6\",\"date\":\"1906-08-11\"},{\"title\":\"The Engineering and Mining Journal 1906-11-24: Vol 82 Iss 21\",\"date\":\"1906-11-24\"},{\"title\":\"The Engineering and Mining Journal 1907-06-22: Vol 83 Iss 25\",\"date\":\"1907-06-22\"},{\"title\":\"The Engineering and Mining Journal 1908-02-29: Vol 85 Iss 9\",\"date\":\"1908-02-29\"},{\"title\":\"The Engineering and Mining Journal 1914-07-18: Vol 98 Iss 3\",\"date\":\"1914-07-18\"},{\"title\":\"The Engineering and Mining Journal 1915-11-27: Vol 100 Iss 22\",\"date\":\"1915-11-27\"},{\"title\":\"Engineering and Mining Journal 1919-02-15: Vol 107 Iss 7\",\"date\":\"1919-02-15\"},{\"title\":\"Engineering and Mining Journal-Press 1925-10-10: Vol 120 Iss 15\",\"date\":\"1925-10-10\"},{\"title\":\"Engineering and Mining Journal 1945-07: Vol 146 Iss 7\",\"date\":\"1945-07-01\"},{\"title\":\"Engineering and Mining Journal 1948-09: Vol 149 Iss 9\",\"date\":\"1948-09-01\"},{\"title\":\"Engineering and Mining Journal 1956-04: Vol 157 Iss 4\",\"date\":\"1956-04-01\"},{\"title\":\"Engineering and Mining Journal 1957-12: Vol 158 Iss 12\",\"date\":\"1957-12-01\"},{\"title\":\"Engineering and Mining Journal 1960-02: Vol 161 Iss 2\",\"date\":\"1960-02-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1893: Vol 56 Index\",\"date\":\"1893-07-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1894: Vol 58 Index\",\"date\":\"1894-07-01\"},{\"title\":\"The Engineering and Mining Journal 1869-09-14: Vol 8 Iss 11\",\"date\":\"1869-09-14\"},{\"title\":\"The Engineering and Mining Journal 1871-01-03: Vol 11 Iss 1\",\"date\":\"1871-01-03\"},{\"title\":\"The Engineering and Mining Journal 1877-10-06: Vol 24 Iss 14\",\"date\":\"1877-10-06\"},{\"title\":\"The Engineering and Mining Journal 1878-01-05: Vol 25 Iss 1\",\"date\":\"1878-01-05\"},{\"title\":\"The Engineering and Mining Journal 1879-07-26: Vol 28 Iss 4\",\"date\":\"1879-07-26\"},{\"title\":\"The Engineering and Mining Journal 1883-12-29: Vol 36 Iss 26\",\"date\":\"1883-12-29\"},{\"title\":\"The Engineering and Mining Journal 1884-03-08: Vol 37 Iss 10\",\"date\":\"1884-03-08\"},{\"title\":\"The Engineering and Mining Journal 1885-06-20: Vol 39 Iss 25\",\"date\":\"1885-06-20\"},{\"title\":\"The Engineering and Mining Journal 1894-09-29: Vol 58 Iss 13\",\"date\":\"1894-09-29\"},{\"title\":\"The Engineering and Mining Journal 1896-07-11: Vol 62 Iss 2\",\"date\":\"1896-07-11\"},{\"title\":\"The Engineering and Mining Journal 1900-03-24: Vol 69 Iss 12\",\"date\":\"1900-03-24\"},{\"title\":\"The Engineering and Mining Journal 1900-05-19: Vol 69 Iss 20\",\"date\":\"1900-05-19\"},{\"title\":\"The Engineering and Mining Journal 1901-01-19: Vol 71 Supplement\",\"date\":\"1901-01-19\"},{\"title\":\"The Engineering and Mining Journal 1901-04-20: Vol 71 Supplement\",\"date\":\"1901-04-20\"},{\"title\":\"The Engineering and Mining Journal 1901-06-29: Vol 71 Iss 26\",\"date\":\"1901-06-29\"},{\"title\":\"The Engineering and Mining Journal 1901-07-06: Vol 72 Iss 1\",\"date\":\"1901-07-06\"},{\"title\":\"The Engineering and Mining Journal 1902-01-25: Vol 73 Iss 4\",\"date\":\"1902-01-25\"},{\"title\":\"The Engineering and Mining Journal 1902-05-31: Vol 73 Iss 22\",\"date\":\"1902-05-31\"},{\"title\":\"The Engineering and Mining Journal 1911-04-22: Vol 91 Iss 16\",\"date\":\"1911-04-22\"},{\"title\":\"Engineering and Mining Journal 1920-05-08: Vol 109 Iss 19\",\"date\":\"1920-05-08\"},{\"title\":\"Engineering and Mining Journal 1920-10-30: Vol 110 Iss 18\",\"date\":\"1920-10-30\"},{\"title\":\"Engineering and Mining Journal 1921-03-12: Vol 111 Iss 11\",\"date\":\"1921-03-12\"},{\"title\":\"Engineering and Mining Journal-Press 1922-04-22: Vol 113 Iss 16\",\"date\":\"1922-04-22\"},{\"title\":\"Engineering and Mining Journal-Press 1926-03-06: Vol 121 Iss 10\",\"date\":\"1926-03-06\"},{\"title\":\"Engineering and Mining Journal-Press 1926-05-29: Vol 121 Iss 22\",\"date\":\"1926-05-29\"},{\"title\":\"Engineering and Mining Journal 1926-07-10: Vol 122 Iss 2\",\"date\":\"1926-07-10\"},{\"title\":\"Engineering and Mining Journal 1927-11-19: Vol 124 Iss 21\",\"date\":\"1927-11-19\"},{\"title\":\"Engineering and Mining Journal 1928-02-11: Vol 125 Iss 6\",\"date\":\"1928-02-11\"},{\"title\":\"Engineering and Mining Journal 1929-07-20: Vol 128 Iss 3\",\"date\":\"1929-07-20\"},{\"title\":\"Engineering and Mining Journal 1929: Vol 127 Index\",\"date\":\"1929-01-01\"},{\"title\":\"Engineering and Mining Journal 1930-04-24: Vol 129 Iss 8\",\"date\":\"1930-04-24\"},{\"title\":\"Engineering and Mining Journal 1932-02: Vol 133 Iss 2\",\"date\":\"1932-02-01\"},{\"title\":\"The Engineering and Mining Journal 1870-10-25: Vol 10 Iss 17\",\"date\":\"1870-10-25\"},{\"title\":\"The Engineering and Mining Journal 1871-02-21: Vol 11 Iss 8\",\"date\":\"1871-02-21\"},{\"title\":\"The Engineering and Mining Journal 1873-02-25: Vol 15 Iss 8\",\"date\":\"1873-02-25\"},{\"title\":\"The Engineering and Mining Journal 1873-08-19: Vol 16 Iss 8\",\"date\":\"1873-08-19\"},{\"title\":\"The Engineering and Mining Journal 1878-10-19: Vol 26 Iss 16\",\"date\":\"1878-10-19\"},{\"title\":\"The Engineering and Mining Journal 1879-04-26: Vol 27 Iss 17\",\"date\":\"1879-04-26\"},{\"title\":\"The Engineering and Mining Journal 1884-09-27: Vol 38 Iss 13\",\"date\":\"1884-09-27\"},{\"title\":\"The Engineering and Mining Journal 1885-03-21: Vol 39 Iss 12\",\"date\":\"1885-03-21\"},{\"title\":\"The Engineering and Mining Journal 1894-10-13: Vol 58 Iss 15\",\"date\":\"1894-10-13\"},{\"title\":\"The Engineering and Mining Journal 1895-08-10: Vol 60 Iss 6\",\"date\":\"1895-08-10\"},{\"title\":\"The Engineering and Mining Journal 1896-02-22: Vol 61 Iss 8\",\"date\":\"1896-02-22\"},{\"title\":\"The Engineering and Mining Journal 1896-06-06: Vol 61 Iss 23\",\"date\":\"1896-06-06\"},{\"title\":\"The Engineering and Mining Journal 1897-06-19: Vol 63 Iss 25\",\"date\":\"1897-06-19\"},{\"title\":\"The Engineering and Mining Journal 1897-10-09: Vol 64 Iss 15\",\"date\":\"1897-10-09\"},{\"title\":\"The Engineering and Mining Journal 1898-10-15: Vol 66 Iss 16\",\"date\":\"1898-10-15\"},{\"title\":\"The Engineering and Mining Journal 1899-07-22: Vol 68 Iss 4\",\"date\":\"1899-07-22\"},{\"title\":\"The Engineering and Mining Journal 1900-01-20: Vol 69 Iss 3\",\"date\":\"1900-01-20\"},{\"title\":\"The Engineering and Mining Journal 1902-12-27: Vol 74 Iss 26\",\"date\":\"1902-12-27\"},{\"title\":\"The Engineering and Mining Journal 1907-02-02: Vol 83 Iss 5\",\"date\":\"1907-02-02\"},{\"title\":\"The Engineering and Mining Journal 1909-02-27: Vol 87 Iss 9\",\"date\":\"1909-02-27\"},{\"title\":\"The Engineering and Mining Journal 1909-05-08: Vol 87 Iss 19\",\"date\":\"1909-05-08\"},{\"title\":\"Engineering and Mining Journal 1916-07-08: Vol 102 Iss 2\",\"date\":\"1916-07-08\"},{\"title\":\"Engineering and Mining Journal 1917-12-08: Vol 104 Iss 23\",\"date\":\"1917-12-08\"},{\"title\":\"Engineering and Mining Journal 1919-12-06: Vol 108 Iss 21\",\"date\":\"1919-12-06\"},{\"title\":\"Engineering and Mining Journal 1927-02-19: Vol 123 Iss 8\",\"date\":\"1927-02-19\"},{\"title\":\"Engineering and Mining Journal 1927-04-16: Vol 123 Iss 16\",\"date\":\"1927-04-16\"},{\"title\":\"Engineering and Mining Journal 1927-05-14: Vol 123 Iss 20\",\"date\":\"1927-05-14\"},{\"title\":\"Engineering and Mining Journal 1944-04: Vol 145 Iss 4\",\"date\":\"1944-04-01\"},{\"title\":\"Engineering and Mining Journal 1948-02: Vol 149 Iss 2\",\"date\":\"1948-02-01\"},{\"title\":\"Engineering and Mining Journal 1952-09: Vol 153 Iss 9\",\"date\":\"1952-09-01\"},{\"title\":\"Engineering and Mining Journal 1954-04: Vol 155 Iss 4\",\"date\":\"1954-04-01\"},{\"title\":\"Engineering and Mining Journal 1955-12: Vol 156 Iss 12\",\"date\":\"1955-12-01\"},{\"title\":\"Engineering and Mining Journal 1956-09: Vol 157 Iss 9\",\"date\":\"1956-09-01\"},{\"title\":\"Engineering and Mining Journal 1957-05: Vol 158 Iss 5\",\"date\":\"1957-05-01\"},{\"title\":\"The Engineering and Mining Journal 1877-08-18: Vol 24 Iss 7\",\"date\":\"1877-08-18\"},{\"title\":\"The Engineering and Mining Journal 1878-07-06: Vol 26 Iss 1\",\"date\":\"1878-07-06\"},{\"title\":\"The Engineering and Mining Journal 1881-04-02: Vol 31 Iss 14\",\"date\":\"1881-04-02\"},{\"title\":\"The Engineering and Mining Journal 1881-06-25: Vol 31 Iss 26\",\"date\":\"1881-06-25\"},{\"title\":\"The Engineering and Mining Journal 1882-08-19: Vol 34 Iss 8\",\"date\":\"1882-08-19\"},{\"title\":\"The Engineering and Mining Journal 1888-08-25: Vol 46 Iss 8\",\"date\":\"1888-08-25\"},{\"title\":\"The Engineering and Mining Journal 1888-11-03: Vol 46 Iss 18\",\"date\":\"1888-11-03\"},{\"title\":\"The Engineering and Mining Journal 1891-11-28: Vol 52 Iss 22\",\"date\":\"1891-11-28\"},{\"title\":\"The Engineering and Mining Journal 1901-04-06: Vol 71 Iss 14\",\"date\":\"1901-04-06\"},{\"title\":\"The Engineering and Mining Journal 1901-09-28: Vol 72 Iss 13\",\"date\":\"1901-09-28\"},{\"title\":\"The Engineering and Mining Journal 1902-03-29: Vol 73 Iss 13\",\"date\":\"1902-03-29\"},{\"title\":\"The Engineering and Mining Journal 1911-01-14: Vol 91 Iss 2\",\"date\":\"1911-01-14\"},{\"title\":\"The Engineering and Mining Journal 1911-12-16: Vol 92 Iss 25\",\"date\":\"1911-12-16\"},{\"title\":\"The Engineering and Mining Journal 1912-03-02: Vol 93 Iss 9\",\"date\":\"1912-03-02\"},{\"title\":\"The Engineering and Mining Journal 1912-05-18: Vol 93 Iss 20\",\"date\":\"1912-05-18\"},{\"title\":\"The Engineering and Mining Journal 1913-04-12: Vol 95 Iss 15\",\"date\":\"1913-04-12\"},{\"title\":\"The Engineering and Mining Journal 1915-07-10: Vol 100 Iss 2\",\"date\":\"1915-07-10\"},{\"title\":\"Engineering and Mining Journal 1920-03-13: Vol 109 Iss 11\",\"date\":\"1920-03-13\"},{\"title\":\"Engineering and Mining Journal 1921-02-12: Vol 111 Iss 7\",\"date\":\"1921-02-12\"},{\"title\":\"Engineering and Mining Journal 1921-04-30: Vol 111 Iss 18\",\"date\":\"1921-04-30\"},{\"title\":\"Engineering and Mining Journal-Press 1922-09-30: Vol 114 Iss 14\",\"date\":\"1922-09-30\"},{\"title\":\"Engineering and Mining Journal-Press 1922-10-07: Vol 114 Iss 15\",\"date\":\"1922-10-07\"},{\"title\":\"Engineering and Mining Journal-Press 1923-11-24: Vol 116 Iss 21\",\"date\":\"1923-11-24\"},{\"title\":\"Engineering and Mining Journal-Press 1924-05-17: Vol 117 Iss 20\",\"date\":\"1924-05-17\"},{\"title\":\"Engineering and Mining Journal-Press 1924-10-11: Vol 118 Iss 15\",\"date\":\"1924-10-11\"},{\"title\":\"Engineering and Mining Journal-Press 1924-11-08: Vol 118 Iss 19\",\"date\":\"1924-11-08\"},{\"title\":\"Engineering and Mining Journal-Press 1924: Vol 118 Index\",\"date\":\"1924-01-01\"},{\"title\":\"Engineering and Mining Journal-Press 1925-04-04: Vol 119 Iss 14\",\"date\":\"1925-04-04\"},{\"title\":\"Engineering and Mining Journal 1937-12: Vol 138 Iss 12\",\"date\":\"1937-12-01\"},{\"title\":\"Engineering and Mining Journal 1938-12: Vol 139 Iss 12\",\"date\":\"1938-12-01\"},{\"title\":\"Engineering and Mining Journal January-December 1945: Vol 146 Index\",\"date\":\"1945-01-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1887: Vol 44 Index\",\"date\":\"1887-07-01\"},{\"title\":\"The Engineering and Mining Journal July - December 1895: Vol 60 Index\",\"date\":\"1895-07-01\"},{\"title\":\"The Engineering and Mining Journal 1872-10-08: Vol 14 Iss 15\",\"date\":\"1872-10-08\"},{\"title\":\"The Engineering and Mining Journal 1872-12-24: Vol 14 Iss 26\",\"date\":\"1872-12-24\"},{\"title\":\"The Engineering and Mining Journal 1875-08-14: Vol 20 Iss 7\",\"date\":\"1875-08-14\"},{\"title\":\"The Engineering and Mining Journal 1875-10-09: Vol 20 Iss 15\",\"date\":\"1875-10-09\"},{\"title\":\"The Engineering and Mining Journal 1876-06-24: Vol 21 Iss 26\",\"date\":\"1876-06-24\"},{\"title\":\"The Engineering and Mining Journal 1876-07-01: Vol 22 Iss 1\",\"date\":\"1876-07-01\"},{\"title\":\"The Engineering and Mining Journal 1877-03-10: Vol 23 Iss 10\",\"date\":\"1877-03-10\"},{\"title\":\"The Engineering and Mining Journal 1877-12-29: Vol 24 Iss 26\",\"date\":\"1877-12-29\"},{\"title\":\"The Engineering and Mining Journal 1878-05-18: Vol 25 Iss 20\",\"date\":\"1878-05-18\"},{\"title\":\"The Engineering and Mining Journal 1895-06-08: Vol 59 Iss 23\",\"date\":\"1895-06-08\"},{\"title\":\"The Engineering and Mining Journal 1896-06-20: Vol 61 Iss 25\",\"date\":\"1896-06-20\"},{\"title\":\"The Engineering and Mining Journal 1896-10-17: Vol 62 Iss 16\",\"date\":\"1896-10-17\"},{\"title\":\"The Engineering and Mining Journal 1909-11-27: Vol 88 Iss 22\",\"date\":\"1909-11-27\"},{\"title\":\"Engineering and Mining Journal 1920-08-14: Vol 110 Iss 7\",\"date\":\"1920-08-14\"},{\"title\":\"Engineering and Mining Journal 1937-03: Vol 138 Iss 3\",\"date\":\"1937-03-01\"},{\"title\":\"Engineering and Mining Journal 1938-04: Vol 139 Iss 4\",\"date\":\"1938-04-01\"},{\"title\":\"Engineering and Mining Journal 1938-10: Vol 139 Iss 10\",\"date\":\"1938-10-01\"},{\"title\":\"Engineering and Mining Journal 1939-08: Vol 140 Iss 8\",\"date\":\"1939-08-01\"},{\"title\":\"Engineering and Mining Journal 1940-11: Vol 141 Iss 11\",\"date\":\"1940-11-01\"},{\"title\":\"Engineering and Mining Journal January - December 1966: Vol 167 Index\",\"date\":\"1966-01-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1871: Vol 11 Index\",\"date\":\"1871-01-01\"},{\"title\":\"The Engineering and Mining Journal January - June 1894: Vol 57 Index\",\"date\":\"1894-01-01\"},{\"title\":\"American Journal of Mining July-December 1867: Vol 4 Index\",\"date\":\"1867-07-01\"},{\"title\":\"The Engineering and Mining Journal 1869-10-12: Vol 8 Iss 15\",\"date\":\"1869-10-12\"},{\"title\":\"The Engineering and Mining Journal 1870-05-31: Vol 9 Iss 22\",\"date\":\"1870-05-31\"},{\"title\":\"The Engineering and Mining Journal 1870-11-29: Vol 10 Iss 22\",\"date\":\"1870-11-29\"},{\"title\":\"The Engineering and Mining Journal 1871-03-14: Vol 11 Iss 11\",\"date\":\"1871-03-14\"},{\"title\":\"The Engineering and Mining Journal 1879-06-21: Vol 27 Iss 25\",\"date\":\"1879-06-21\"},{\"title\":\"The Engineering and Mining Journal 1880-01-24: Vol 29 Iss 4\",\"date\":\"1880-01-24\"},{\"title\":\"The Engineering and Mining Journal 1892-05-14: Vol 53 Iss 20\",\"date\":\"1892-05-14\"},{\"title\":\"The Engineering and Mining Journal 1894-03-10: Vol 57 Iss 10\",\"date\":\"1894-03-10\"},{\"title\":\"The Engineering and Mining Journal 1905-12-30: Vol 80 Iss 26\",\"date\":\"1905-12-30\"},{\"title\":\"The Engineering and Mining Journal 1906-02-10: Vol 81 Iss 6\",\"date\":\"1906-02-10\"},{\"title\":\"Engineering and Mining Journal 1917-04-21: Vol 103 Iss 16\",\"date\":\"1917-04-21\"},{\"title\":\"Engineering and Mining Journal 1917-11-10: Vol 104 Iss 19\",\"date\":\"1917-11-10\"},{\"title\":\"Engineering and Mining Journal 1918-04-20: Vol 105 Iss 16\",\"date\":\"1918-04-20\"},{\"title\":\"Engineering and Mining Journal 1919-08-30: Vol 108 Iss 9\",\"date\":\"1919-08-30\"},{\"title\":\"Engineering and Mining Journal 1926-09-04: Vol 122 Iss 10\",\"date\":\"1926-09-04\"},{\"title\":\"Engineering and Mining Journal 1928-09-29: Vol 126 Iss 13\",\"date\":\"1928-09-29\"},{\"title\":\"Engineering and Mining Journal 1929-02-23: Vol 127 Iss 8\",\"date\":\"1929-02-23\"},{\"title\":\"The Engineering and Mining Journal 1880-11-13: Vol 30 Iss 20\",\"date\":\"1880-11-13\"},{\"title\":\"The Engineering and Mining Journal 1884-04-05: Vol 37 Iss 14\",\"date\":\"1884-04-05\"},{\"title\":\"The Engineering and Mining Journal 1884-04-19: Vol 37 Iss 16\",\"date\":\"1884-04-19\"},{\"title\":\"The Engineering and Mining Journal 1884-10-18: Vol 38 Iss 16\",\"date\":\"1884-10-18\"},{\"title\":\"The Engineering and Mining Journal 1886-05-15: Vol 41 Iss 20\",\"date\":\"1886-05-15\"},{\"title\":\"The Engineering and Mining Journal 1888-12-01: Vol 46 Iss 22\",\"date\":\"1888-12-01\"},{\"title\":\"The Engineering and Mining Journal 1889-08-24: Vol 48 Iss 8\",\"date\":\"1889-08-24\"},{\"title\":\"The Engineering and Mining Journal 1889-11-02: Vol 48 Iss 18\",\"date\":\"1889-11-02\"},{\"title\":\"The Engineering and Mining Journal 1907-10-12: Vol 84 Iss 15\",\"date\":\"1907-10-12\"},{\"title\":\"The Engineering and Mining Journal 1908-05-16: Vol 85 Iss 20\",\"date\":\"1908-05-16\"},{\"title\":\"The Engineering and Mining Journal 1914-09-05: Vol 98 Iss 10\",\"date\":\"1914-09-05\"},{\"title\":\"The Engineering and Mining Journal 1915-07-24: Vol 100 Iss 4\",\"date\":\"1915-07-24\"},{\"title\":\"Engineering and Mining Journal-Press 1923-11-03: Vol 116 Iss 18\",\"date\":\"1923-11-03\"},{\"title\":\"Engineering and Mining Journal-Press 1924-10-18: Vol 118 Iss 16\",\"date\":\"1924-10-18\"},{\"title\":\"Engineering and Mining Journal-Press 1925-10-03: Vol 120 Iss 14\",\"date\":\"1925-10-03\"},{\"title\":\"Engineering and Mining Journal 1929-07-13: Vol 128 Iss 2\",\"date\":\"1929-07-13\"},{\"title\":\"Engineering and Mining Journal 1929-12-07: Vol 128 Iss 23\",\"date\":\"1929-12-07\"},{\"title\":\"Engineering and Mining Journal 1930-09-25: Vol 130 Iss 6\",\"date\":\"1930-09-25\"},{\"title\":\"Engineering and Mining Journal 1932-10: Vol 133 Iss 10\",\"date\":\"1932-10-01\"},{\"title\":\"Engineering and Mining Journal 1934-03: Vol 135 Iss 3\",\"date\":\"1934-03-01\"},{\"title\":\"Engineering and Mining Journal 1951-11: Vol 152 Iss 11\",\"date\":\"1951-11-01\"},{\"title\":\"Engineering and Mining Journal 1953-08: Vol 154 Iss 8\",\"date\":\"1953-08-01\"},{\"title\":\"Engineering and Mining Journal 1955-10: Vol 156 Iss 10\",\"date\":\"1955-10-01\"},{\"title\":\"Engineering and Mining Journal 1957-10: Vol 158 Iss 10\",\"date\":\"1957-10-01\"},{\"title\":\"American Journal of Mining 1866-03-31: Vol 1 Iss 1\",\"date\":\"1866-03-31\"},{\"title\":\"American Journal of Mining 1867-02-09: Vol 2 Iss 20\",\"date\":\"1867-02-09\"},{\"title\":\"The Engineering and Mining Journal 1870-02-08: Vol 9 Iss 6\",\"date\":\"1870-02-08\"},{\"title\":\"The Engineering and Mining Journal 1870-05-03: Vol 9 Iss 18\",\"date\":\"1870-05-03\"},{\"title\":\"The Engineering and Mining Journal 1874-10-10: Vol 18 Iss 15\",\"date\":\"1874-10-10\"},{\"title\":\"The Engineering and Mining Journal 1875-01-02: Vol 19 Iss 1\",\"date\":\"1875-01-02\"},{\"title\":\"The Engineering and Mining Journal 1875-02-27: Vol 19 Iss 9\",\"date\":\"1875-02-27\"},{\"title\":\"The Engineering and Mining Journal 1876-02-12: Vol 21 Iss 7\",\"date\":\"1876-02-12\"},{\"title\":\"The Engineering and Mining Journal 1873-05-20: Vol 15 Iss 20\",\"date\":\"1873-05-20\"},{\"title\":\"The Engineering and Mining Journal 1873-07-22: Vol 16 Iss 4\",\"date\":\"1873-07-22\"},{\"title\":\"The Engineering and Mining Journal 1887-02-05: Vol 43 Iss 6\",\"date\":\"1887-02-05\"},{\"title\":\"The Engineering and Mining Journal 1887-10-08: Vol 44 Iss 15\",\"date\":\"1887-10-08\"},{\"title\":\"The Engineering and Mining Journal 1881-07-30: Vol 32 Iss 5\",\"date\":\"1881-07-30\"},{\"title\":\"The Engineering and Mining Journal 1881-12-03: Vol 32 Iss 23\",\"date\":\"1881-12-03\"},{\"title\":\"The Engineering and Mining Journal 1882-02-18: Vol 33 Iss 7\",\"date\":\"1882-02-18\"},{\"title\":\"The Engineering and Mining Journal 1895-03-09: Vol 59 Iss 10\",\"date\":\"1895-03-09\"},{\"title\":\"The Engineering and Mining Journal 1895-04-06: Vol 59 Iss 14\",\"date\":\"1895-04-06\"},{\"title\":\"The Engineering and Mining Journal 1895-05-18: Vol 59 Iss 20\",\"date\":\"1895-05-18\"},{\"title\":\"The Engineering and Mining Journal 1895-08-03: Vol 60 Iss 5\",\"date\":\"1895-08-03\"},{\"title\":\"The Engineering and Mining Journal 1897-12-11: Vol 64 Iss 24\",\"date\":\"1897-12-11\"},{\"title\":\"The Engineering and Mining Journal 1896-02-01: Vol 61 Iss 5\",\"date\":\"1896-02-01\"},{\"title\":\"The Engineering and Mining Journal 1896-05-09: Vol 61 Iss 19\",\"date\":\"1896-05-09\"},{\"title\":\"The Engineering and Mining Journal 1896-06-27: Vol 61 Iss 26\",\"date\":\"1896-06-27\"},{\"title\":\"The Engineering and Mining Journal 1896-11-07: Vol 62 Iss 19\",\"date\":\"1896-11-07\"},{\"title\":\"The Engineering and Mining Journal 1903-01-24: Vol 75 Iss 4\",\"date\":\"1903-01-24\"},{\"title\":\"The Engineering and Mining Journal 1898-06-11: Vol 65 Iss 24\",\"date\":\"1898-06-11\"},{\"title\":\"The Engineering and Mining Journal 1898-09-17: Vol 66 Iss 12\",\"date\":\"1898-09-17\"},{\"title\":\"The Engineering and Mining Journal 1899-07-15: Vol 68 Iss 3\",\"date\":\"1899-07-15\"},{\"title\":\"The Engineering and Mining Journal 1899-08-12: Vol 68 Iss 7\",\"date\":\"1899-08-12\"},{\"title\":\"The Engineering and Mining Journal 1901-09-21: Vol 72 Iss 12\",\"date\":\"1901-09-21\"},{\"title\":\"The Engineering and Mining Journal 1907-01-26: Vol 83 Iss 4\",\"date\":\"1907-01-26\"},{\"title\":\"The Engineering and Mining Journal 1907-06-08: Vol 83 Iss 23\",\"date\":\"1907-06-08\"},{\"title\":\"The Engineering and Mining Journal 1907-08-03: Vol 84 Iss 5\",\"date\":\"1907-08-03\"},{\"title\":\"The Engineering and Mining Journal 1907-09-28: Vol 84 Iss 13\",\"date\":\"1907-09-28\"},{\"title\":\"The Engineering and Mining Journal 1907-11-09: Vol 84 Iss 19\",\"date\":\"1907-11-09\"},{\"title\":\"The Engineering and Mining Journal 1910-11-19: Vol 90 Iss 21\",\"date\":\"1910-11-19\"},{\"title\":\"The Engineering and Mining Journal 1915-08-28: Vol 100 Iss 9\",\"date\":\"1915-08-28\"},{\"title\":\"Engineering and Mining Journal 1918-04-06: Vol 105 Iss 14\",\"date\":\"1918-04-06\"},{\"title\":\"Engineering and Mining Journal 1918-05-11: Vol 105 Iss 19\",\"date\":\"1918-05-11\"},{\"title\":\"Engineering and Mining Journal 1919-02-01: Vol 107 Iss 5\",\"date\":\"1919-02-01\"},{\"title\":\"Engineering and Mining Journal-Press 1922-10-21: Vol 114 Iss 17\",\"date\":\"1922-10-21\"},{\"title\":\"Engineering and Mining Journal-Press 1923-01-06: Vol 115 Iss 1\",\"date\":\"1923-01-06\"},{\"title\":\"Engineering and Mining Journal 1929-08-03: Vol 128 Iss 5\",\"date\":\"1929-08-03\"},{\"title\":\"Engineering and Mining Journal 1929-12-21: Vol 128 Iss 25\",\"date\":\"1929-12-21\"},{\"title\":\"Engineering and Mining Journal 1942-05: Vol 143 Iss 5\",\"date\":\"1942-05-01\"},{\"title\":\"Engineering and Mining Journal 1943-09: Vol 144 Iss 9\",\"date\":\"1943-09-01\"},{\"title\":\"The Engineering and Mining Journal January - June 1899: Vol 67 Index\",\"date\":\"1899-01-01\"},{\"title\":\"The Engineering and Mining Journal January - June 1900: Vol 69 Index\",\"date\":\"1900-01-01\"},{\"title\":\"Engineering and Mining Journal January 1-June 30, 1917: Vol 103 Index\",\"date\":\"1917-01-01\"},{\"title\":\"Engineering and Mining Journal January-December 1964: Vol 165 Index\",\"date\":\"1964-01-01\"},{\"title\":\"American Journal of Mining January-June 1869: Vol 7 Index\",\"date\":\"1869-01-01\"},{\"title\":\"American Journal of Mining 1867-11-16: Vol 4 Iss 20\",\"date\":\"1867-11-16\"},{\"title\":\"American Journal of Mining 1868-01-11: Vol 5 Iss 2\",\"date\":\"1868-01-11\"},{\"title\":\"American Journal of Mining 1868-03-21: Vol 5 Iss 12\",\"date\":\"1868-03-21\"},{\"title\":\"American Journal of Mining 1868-09-12: Vol 6 Iss 11\",\"date\":\"1868-09-12\"},{\"title\":\"American Journal of Mining 1868-10-24: Vol 6 Iss 17\",\"date\":\"1868-10-24\"},{\"title\":\"American Journal of Mining 1868-11-28: Vol 6 Iss 22\",\"date\":\"1868-11-28\"},{\"title\":\"The Engineering and Mining Journal 1869-07-20: Vol 8 Iss 3\",\"date\":\"1869-07-20\"},{\"title\":\"The Engineering and Mining Journal 1871-04-11: Vol 11 Iss 15\",\"date\":\"1871-04-11\"},{\"title\":\"The Engineering and Mining Journal 1877-02-24: Vol 23 Iss 8\",\"date\":\"1877-02-24\"},{\"title\":\"The Engineering and Mining Journal 1877-09-22: Vol 24 Iss 12\",\"date\":\"1877-09-22\"},{\"title\":\"The Engineering and Mining Journal 1879-11-01: Vol 28 Iss 18\",\"date\":\"1879-11-01\"},{\"title\":\"The Engineering and Mining Journal 1880-09-18: Vol 30 Iss 12\",\"date\":\"1880-09-18\"},{\"title\":\"The Engineering and Mining Journal 1885-02-07: Vol 39 Iss 6\",\"date\":\"1885-02-07\"},{\"title\":\"The Engineering and Mining Journal 1885-02-28: Vol 39 Iss 9\",\"date\":\"1885-02-28\"},{\"title\":\"The Engineering and Mining Journal 1885-03-14: Vol 39 Iss 11\",\"date\":\"1885-03-14\"},{\"title\":\"The Engineering and Mining Journal 1889-10-05: Vol 48 Iss 14\",\"date\":\"1889-10-05\"},{\"title\":\"The Engineering and Mining Journal 1890-05-10: Vol 49 Iss 19\",\"date\":\"1890-05-10\"},{\"title\":\"The Engineering and Mining Journal 1892-03-12: Vol 53 Iss 11\",\"date\":\"1892-03-12\"},{\"title\":\"The Engineering and Mining Journal 1893-03-18: Vol 55 Iss 11\",\"date\":\"1893-03-18\"},{\"title\":\"The Engineering and Mining Journal 1893-04-08: Vol 55 Iss 14\",\"date\":\"1893-04-08\"},{\"title\":\"The Engineering and Mining Journal 1893-11-11: Vol 56 Iss 20\",\"date\":\"1893-11-11\"},{\"title\":\"The Engineering and Mining Journal 1893-12-02: Vol 56 Iss 23\",\"date\":\"1893-12-02\"},{\"title\":\"The Engineering and Mining Journal 1899-09-16: Vol 68 Iss 12\",\"date\":\"1899-09-16\"},{\"title\":\"The Engineering and Mining Journal 1900-03-31: Vol 69 Iss 13\",\"date\":\"1900-03-31\"},{\"title\":\"The Engineering and Mining Journal 1903-08-08: Vol 76 Iss 6\",\"date\":\"1903-08-08\"},{\"title\":\"The Engineering and Mining Journal 1904-05-19: Vol 77 Iss 20\",\"date\":\"1904-05-19\"},{\"title\":\"The Engineering and Mining Journal 1908-04-04: Vol 85 Iss 14\",\"date\":\"1908-04-04\"},{\"title\":\"The Engineering and Mining Journal 1908-07-18: Vol 86 Iss 3\",\"date\":\"1908-07-18\"},{\"title\":\"The Engineering and Mining Journal 1908-11-07: Vol 86 Iss 19\",\"date\":\"1908-11-07\"},{\"title\":\"The Engineering and Mining Journal 1909-01-02: Vol 87 Iss 1\",\"date\":\"1909-01-02\"},{\"title\":\"The Engineering and Mining Journal 1909-04-24: Vol 87 Iss 17\",\"date\":\"1909-04-24\"},{\"title\":\"The Engineering and Mining Journal 1913-05-24: Vol 95 Iss 21\",\"date\":\"1913-05-24\"},{\"title\":\"The Engineering and Mining Journal 1913-10-04: Vol 96 Iss 14\",\"date\":\"1913-10-04\"},{\"title\":\"The Engineering and Mining Journal 1913-12-27: Vol 96 Iss 26\",\"date\":\"1913-12-27\"},{\"title\":\"The Engineering and Mining Journal 1914-08-01: Vol 98 Iss 5\",\"date\":\"1914-08-01\"},{\"title\":\"The Engineering and Mining Journal 1909-08-28: Vol 88 Iss 9\",\"date\":\"1909-08-28\"},{\"title\":\"The Engineering and Mining Journal 1910-01-01: Vol 89 Iss 1\",\"date\":\"1910-01-01\"},{\"title\":\"The Engineering and Mining Journal 1910-01-15: Vol 89 Iss 3\",\"date\":\"1910-01-15\"},{\"title\":\"The Engineering and Mining Journal 1910-08-27: Vol 90 Iss 9\",\"date\":\"1910-08-27\"},{\"title\":\"The Engineering and Mining Journal 1916-02-12: Vol 101 Iss 7\",\"date\":\"1916-02-12\"},{\"title\":\"The Engineering and Mining Journal 1916-04-29: Vol 101 Iss 18\",\"date\":\"1916-04-29\"},{\"title\":\"The Engineering and Mining Journal 1912-11-16: Vol 94 Iss 20\",\"date\":\"1912-11-16\"},{\"title\":\"Engineering and Mining Journal 1917-12-29: Vol 104 Iss 26\",\"date\":\"1917-12-29\"},{\"title\":\"Engineering and Mining Journal 1919-12-27: Vol 108 Iss 23\",\"date\":\"1919-12-27\"},{\"title\":\"Engineering and Mining Journal 1920-04-03: Vol 109 Iss 14\",\"date\":\"1920-04-03\"},{\"title\":\"Engineering and Mining Journal-Press 1923-06-02: Vol 115 Iss 22\",\"date\":\"1923-06-02\"},{\"title\":\"Engineering and Mining Journal-Press 1924-10-04: Vol 118 Iss 14\",\"date\":\"1924-10-04\"},{\"title\":\"Engineering and Mining Journal-Press 1925-01-03: Vol 119 Iss 1\",\"date\":\"1925-01-03\"},{\"title\":\"Engineering and Mining Journal-Press 1925-07-18: Vol 120 Iss 3\",\"date\":\"1925-07-18\"},{\"title\":\"Engineering and Mining Journal 1928-01-28: Vol 125 Iss 4\",\"date\":\"1928-01-28\"},{\"title\":\"Engineering and Mining Journal 1928-07-21: Vol 126 Iss 3\",\"date\":\"1928-07-21\"},{\"title\":\"Engineering and Mining Journal 1929-01-12: Vol 127 Iss 2\",\"date\":\"1929-01-12\"},{\"title\":\"Engineering and Mining Journal-Press 1925-10-17: Vol 120 Iss 16\",\"date\":\"1925-10-17\"},{\"title\":\"Engineering and Mining Journal-Press 1926-05-08: Vol 121 Iss 19\",\"date\":\"1926-05-08\"},{\"title\":\"Engineering and Mining Journal 1931-06-08: Vol 131 Iss 11\",\"date\":\"1931-06-08\"},{\"title\":\"Engineering and Mining Journal 1931-11-23: Vol 132 Iss 10\",\"date\":\"1931-11-23\"},{\"title\":\"Engineering and Mining Journal 1932-03: Vol 133 Iss 3\",\"date\":\"1932-03-01\"},{\"title\":\"Engineering and Mining Journal 1932-04: Vol 133 Iss 4\",\"date\":\"1932-04-01\"},{\"title\":\"Engineering and Mining Journal 1949-12: Vol 150 Iss 12\",\"date\":\"1949-12-01\"},{\"title\":\"Engineering and Mining Journal 1952-12: Vol 153 Iss 12\",\"date\":\"1952-12-01\"},{\"title\":\"Engineering and Mining Journal 1953-09: Vol 154 Iss 9\",\"date\":\"1953-09-01\"},{\"title\":\"Engineering and Mining Journal 1934-07: Vol 135 Iss 7\",\"date\":\"1934-07-01\"},{\"title\":\"Engineering and Mining Journal 1958: Vol 159 Index\",\"date\":\"1958-01-01\"},{\"title\":\"Engineering and Mining Journal 1960-09: Vol 161 Iss 9\",\"date\":\"1960-09-01\"},{\"title\":\"Engineering and Mining Journal 1945-02: Vol 146 Iss 2\",\"date\":\"1945-02-01\"},{\"title\":\"Engineering and Mining Journal 1948-07: Vol 149 Iss 7\",\"date\":\"1948-07-01\"},{\"title\":\"The Engineering and Mining Journal January-June 1885: Vol 39 Index\",\"date\":\"1885-01-01\"},{\"title\":\"The Engineering and Mining Journal July-December 1882: Vol 34 Index\",\"date\":\"1882-07-01\"},{\"title\":\"Engineering and Mining Journal 1956-10: Vol 157 Iss 10\",\"date\":\"1956-10-01\"},{\"title\":\"Engineering and Mining Journal 1957-02: Vol 158 Iss 2\",\"date\":\"1957-02-01\"},{\"title\":\"American Journal of Mining 1867-04-27: Vol 3 Iss 5\",\"date\":\"1867-04-27\"},{\"title\":\"The Engineering and Mining Journal 1877-05-26: Vol 23 Iss 21\",\"date\":\"1877-05-26\"},{\"title\":\"The Engineering and Mining Journal 1877-07-21: Vol 24 Iss 3\",\"date\":\"1877-07-21\"},{\"title\":\"The Engineering and Mining Journal 1876-09-09: Vol 22 Iss 11\",\"date\":\"1876-09-09\"},{\"title\":\"The Engineering and Mining Journal 1883-06-16: Vol 35 Iss 24\",\"date\":\"1883-06-16\"},{\"title\":\"The Engineering and Mining Journal 1882-04-01: Vol 33 Iss 13\",\"date\":\"1882-04-01\"},{\"title\":\"The Engineering and Mining Journal 1902-08-02: Vol 74 Iss 5\",\"date\":\"1902-08-02\"},{\"title\":\"The Engineering and Mining Journal 1905-04-27: Vol 79 Iss 17\",\"date\":\"1905-04-27\"},{\"title\":\"The Engineering and Mining Journal 1903-07-25: Vol 76 Iss 4\",\"date\":\"1903-07-25\"},{\"title\":\"The Engineering and Mining Journal 1904-01-28: Vol 77 Iss 4\",\"date\":\"1904-01-28\"},{\"title\":\"The Engineering and Mining Journal 1909-03-27: Vol 87 Iss 13\",\"date\":\"1909-03-27\"},{\"title\":\"Engineering and Mining Journal 1920-06-05: Vol 109 Iss 23\",\"date\":\"1920-06-05\"},{\"title\":\"Engineering and Mining Journal-Press 1925-06-20: Vol 119 Iss 25\",\"date\":\"1925-06-20\"},{\"title\":\"Engineering and Mining Journal 1929-01-26: Vol 127 Iss 4\",\"date\":\"1929-01-26\"},{\"title\":\"Engineering and Mining Journal 1927-12-03: Vol 124 Iss 23\",\"date\":\"1927-12-03\"},{\"title\":\"Engineering and Mining Journal 1944-06: Vol 145 Iss 6\",\"date\":\"1944-06-01\"},{\"title\":\"Engineering and Mining Journal 1962: Vol 163 Index\",\"date\":\"1962-01-01\"},{\"title\":\"American Journal of Mining 1869-04-17: Vol 7 Iss 16\",\"date\":\"1869-04-17\"},{\"title\":\"The Engineering and Mining Journal 1871-05-30: Vol 11 Iss 22\",\"date\":\"1871-05-30\"},{\"title\":\"The Engineering and Mining Journal 1874-11-21: Vol 18 Iss 21\",\"date\":\"1874-11-21\"},{\"title\":\"The Engineering and Mining Journal 1874-06-06: Vol 17 Iss 23\",\"date\":\"1874-06-06\"},{\"title\":\"The Engineering and Mining Journal 1883-11-17: Vol 36 Iss 20\",\"date\":\"1883-11-17\"},{\"title\":\"The Engineering and Mining Journal 1892-07-09: Vol 54 Iss 2\",\"date\":\"1892-07-09\"},{\"title\":\"The Engineering and Mining Journal 1896-09-19: Vol 62 Iss 12\",\"date\":\"1896-09-19\"},{\"title\":\"The Engineering and Mining Journal 1893-12-09: Vol 56 Iss 24\",\"date\":\"1893-12-09\"},{\"title\":\"The Engineering and Mining Journal 1894-01-27: Vol 57 Iss 4\",\"date\":\"1894-01-27\"},{\"title\":\"The Engineering and Mining Journal 1907-08-17: Vol 84 Iss 7\",\"date\":\"1907-08-17\"},{\"title\":\"The Engineering and Mining Journal 1910-11-12: Vol 90 Iss 20\",\"date\":\"1910-11-12\"},{\"title\":\"The Engineering and Mining Journal 1911-12-02: Vol 92 Iss 23\",\"date\":\"1911-12-02\"},{\"title\":\"Engineering and Mining Journal 1921-02-19: Vol 111 Iss 8\",\"date\":\"1921-02-19\"},{\"title\":\"The Engineering and Mining Journal 1873-07-29: Vol 16 Iss 5\",\"date\":\"1873-07-29\"},{\"title\":\"The Engineering and Mining Journal 1883-08-25: Vol 36 Iss 8\",\"date\":\"1883-08-25\"},{\"title\":\"The Engineering and Mining Journal 1882-01-14: Vol 33 Iss 2\",\"date\":\"1882-01-14\"},{\"title\":\"The Engineering and Mining Journal 1882-09-16: Vol 34 Iss 12\",\"date\":\"1882-09-16\"},{\"title\":\"The Engineering and Mining Journal 1894-12-01: Vol 58 Iss 22\",\"date\":\"1894-12-01\"},{\"title\":\"The Engineering and Mining Journal 1894-02-17: Vol 57 Iss 7\",\"date\":\"1894-02-17\"},{\"title\":\"The Engineering and Mining Journal 1907-11-02: Vol 84 Iss 18\",\"date\":\"1907-11-02\"},{\"title\":\"The Engineering and Mining Journal 1872-05-28: 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2462\",\"date\":\"1882-10-28\"},{\"title\":\"The Mining Journal 1881-08-06: Vol 51 Supplement\",\"date\":\"1881-08-06\"},{\"title\":\"The Mining Journal 1880-06-12: Vol 50 Supplement\",\"date\":\"1880-06-12\"},{\"title\":\"The Mining Journal 1880-08-07: Vol 50 Iss 2346\",\"date\":\"1880-08-07\"},{\"title\":\"The Mining Journal 1884-06-21: Vol 54 Supplement\",\"date\":\"1884-06-21\"},{\"title\":\"The Mining Journal 1884-09-13: Vol 54 Supplement\",\"date\":\"1884-09-13\"},{\"title\":\"The Mining Journal 1883-03-24: Vol 53 Supplement\",\"date\":\"1883-03-24\"},{\"title\":\"The Mining Journal 1883-07-14: Vol 53 Iss 2499\",\"date\":\"1883-07-14\"},{\"title\":\"The Mining Journal 1883-09-01: Vol 53 Supplement\",\"date\":\"1883-09-01\"},{\"title\":\"The Mining Journal 1954-02-12: Vol 242 Iss 6182\",\"date\":\"1954-02-12\"},{\"title\":\"The Mining Journal 1954-04-30: Vol 242 Iss 6193\",\"date\":\"1954-04-30\"},{\"title\":\"The Mining Journal 1957-11-15: Vol 249 Iss 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319\",\"date\":\"1841-10-02\"},{\"title\":\"Mining Journal 1841-10-30: Vol 11 Iss 323\",\"date\":\"1841-10-30\"},{\"title\":\"Mining Journal 1842-07-09: Vol 12 Iss 359\",\"date\":\"1842-07-09\"},{\"title\":\"Mining Journal 1842-10-29: Vol 12 Iss 375\",\"date\":\"1842-10-29\"},{\"title\":\"Mining Journal 1843-04-22: Vol 13 Iss 400\",\"date\":\"1843-04-22\"},{\"title\":\"Mining Journal 1844: Vol 14 Supplement\",\"date\":\"1844-01-01\"},{\"title\":\"Mining Journal 1846-10-10: Vol 16 Iss 581\",\"date\":\"1846-10-10\"},{\"title\":\"Mining Journal 1847-06-05: Vol 17 Iss 615\",\"date\":\"1847-06-05\"},{\"title\":\"Mining Journal 1846-01-24: Vol 16 Iss 544\",\"date\":\"1846-01-24\"},{\"title\":\"Mining Journal 1846-09-05: Vol 16 Iss 576\",\"date\":\"1846-09-05\"},{\"title\":\"Mining Journal 1840-06-27: Vol 10 Iss 253\",\"date\":\"1840-06-27\"},{\"title\":\"Mining Journal 1840-10-17: Vol 10 Iss 269\",\"date\":\"1840-10-17\"},{\"title\":\"Mining Journal 1851-08-02: Vol 21 Iss 832\",\"date\":\"1851-08-02\"},{\"title\":\"The Mining Journal 1855-03-31: Vol 25 Iss 1023\",\"date\":\"1855-03-31\"},{\"title\":\"The Mining Journal 1853: Vol 23 Index\",\"date\":\"1853-01-01\"},{\"title\":\"Mining Journal 1852-09-25: Vol 22 Iss 892\",\"date\":\"1852-09-25\"},{\"title\":\"The Mining Journal 1853-01-29: Vol 23 Iss 910\",\"date\":\"1853-01-29\"},{\"title\":\"Mining Journal 1838-08-25: Vol 7 Iss 157\",\"date\":\"1838-08-25\"},{\"title\":\"Mining Journal 1844-02-10: Vol 14 Iss 442\",\"date\":\"1844-02-10\"},{\"title\":\"Mining Journal 1844-04-06: Vol 14 Iss 450\",\"date\":\"1844-04-06\"},{\"title\":\"Mining Journal 1848-09-30: Vol 18 Iss 684\",\"date\":\"1848-09-30\"},{\"title\":\"Mining Journal 1850-07-13: Vol 20 Iss 777\",\"date\":\"1850-07-13\"},{\"title\":\"Mining Journal 1848-12-23: Vol 18 Iss 696\",\"date\":\"1848-12-23\"},{\"title\":\"The Mining Journal 1856-07-12: Vol 26 Supplement\",\"date\":\"1856-07-12\"},{\"title\":\"The Mining Journal 1856-10-11: Vol 26 Iss 1103\",\"date\":\"1856-10-11\"},{\"title\":\"The Mining Journal 1856-12-20: Vol 26 Iss 1113\",\"date\":\"1856-12-20\"},{\"title\":\"The Mining Journal 1883-02-17: Vol 53 Supplement\",\"date\":\"1883-02-17\"},{\"title\":\"The Mining Journal 1885-02-14: Vol 55 Supplement\",\"date\":\"1885-02-14\"},{\"title\":\"The Mining Journal 1885-04-11: Vol 55 Iss 2590\",\"date\":\"1885-04-11\"},{\"title\":\"The Mining Journal 1894-05-12: Vol 64 Iss 3064\",\"date\":\"1894-05-12\"},{\"title\":\"The Mining Journal 1894-12-08: Vol 64 Iss 3094\",\"date\":\"1894-12-08\"},{\"title\":\"The Mining Journal 1895-05-25: Vol 65 Iss 3118\",\"date\":\"1895-05-25\"},{\"title\":\"The Mining Journal 1895-07-06: Vol 65 Iss 3124\",\"date\":\"1895-07-06\"},{\"title\":\"The Mining Journal 1955-05-06: Vol 244 Iss 6246\",\"date\":\"1955-05-06\"},{\"title\":\"The Mining Journal 1958-08-01: Vol 251 Iss 6415\",\"date\":\"1958-08-01\"},{\"title\":\"The Mining Journal 1959-02-06: Vol 252 Iss 6442\",\"date\":\"1959-02-06\"},{\"title\":\"The Mining Journal 1959-06-12: Vol 252 Iss 6460\",\"date\":\"1959-06-12\"},{\"title\":\"The Mining Journal 1959-07-17: Vol 253 Iss 6465\",\"date\":\"1959-07-17\"},{\"title\":\"The Mining Journal 1959-08-21: Vol 253 Iss 6470\",\"date\":\"1959-08-21\"},{\"title\":\"The Mining Journal January-December 1958: Vol 250-251 Index\",\"date\":\"1958-01-01\"},{\"title\":\"The Mining Journal January-December 1962: Vol 258 Index\",\"date\":\"1962-01-01\"},{\"title\":\"The Mining Journal 1857-10-17: Vol 27 Iss 1156\",\"date\":\"1857-10-17\"},{\"title\":\"The Mining Journal 1861-08-10: Vol 31 Iss 1355\",\"date\":\"1861-08-10\"},{\"title\":\"The Mining Journal 1863-05-02: Vol 33 Iss 1445\",\"date\":\"1863-05-02\"},{\"title\":\"The Mining Journal 1863-07-11: Vol 33 Iss 1455\",\"date\":\"1863-07-11\"},{\"title\":\"The Mining Journal 1863-10-17: Vol 33 Supplement\",\"date\":\"1863-10-17\"},{\"title\":\"The Mining Journal 1862-07-26: Vol 32 Supplement\",\"date\":\"1862-07-26\"},{\"title\":\"The Mining Journal 1862: Vol 32 Index\",\"date\":\"1862-01-01\"},{\"title\":\"The Mining Journal 1859-06-25: Vol 29 Iss 1244\",\"date\":\"1859-06-25\"},{\"title\":\"The Mining Journal 1859-11-19: Vol 29 Iss 1265\",\"date\":\"1859-11-19\"},{\"title\":\"The Mining Journal 1858-08-21: Vol 28 Iss 1200\",\"date\":\"1858-08-21\"},{\"title\":\"The Mining Journal 1858-12-18: Vol 28 Iss 1217\",\"date\":\"1858-12-18\"},{\"title\":\"The Mining Journal 1859-02-05: Vol 29 Iss 1224\",\"date\":\"1859-02-05\"},{\"title\":\"The Mining Journal 1859-02-12: Vol 29 Supplement\",\"date\":\"1859-02-12\"},{\"title\":\"The Mining Journal 1859-03-26: Vol 29 Supplement\",\"date\":\"1859-03-26\"},{\"title\":\"The Mining Journal 1859-04-30: Vol 29 Iss 1236\",\"date\":\"1859-04-30\"},{\"title\":\"The Mining Journal 1859-05-21: Vol 29 Iss 1239\",\"date\":\"1859-05-21\"},{\"title\":\"The Mining Journal 1864-08-13: Vol 34 Iss 1512\",\"date\":\"1864-08-13\"},{\"title\":\"The Mining Journal 1864-09-24: Vol 34 Iss 1518\",\"date\":\"1864-09-24\"},{\"title\":\"The Mining Journal 1866-02-17: Vol 36 Iss 1591\",\"date\":\"1866-02-17\"},{\"title\":\"The Mining Journal 1866-06-09: Vol 36 Iss 1607\",\"date\":\"1866-06-09\"},{\"title\":\"The Mining Journal 1866-06-30: Vol 36 Iss 1610\",\"date\":\"1866-06-30\"},{\"title\":\"The Mining Journal 1865-04-22: Vol 35 Iss 1548\",\"date\":\"1865-04-22\"},{\"title\":\"The Mining Journal 1865-08-05: Vol 35 Iss 1563\",\"date\":\"1865-08-05\"},{\"title\":\"The Mining Journal 1865-09-16: Vol 35 Iss 1569\",\"date\":\"1865-09-16\"},{\"title\":\"Mining Journal 1842-05-07: Vol 12 Iss 350\",\"date\":\"1842-05-07\"},{\"title\":\"The Mining Journal 1863-06-20: Vol 33 Supplement\",\"date\":\"1863-06-20\"},{\"title\":\"The Mining Journal 1878-09-07: Vol 48 Iss 2246\",\"date\":\"1878-09-07\"},{\"title\":\"The Mining Journal 1881-12-03: Vol 51 Iss 2415\",\"date\":\"1881-12-03\"},{\"title\":\"The Mining Journal 1884-02-16: Vol 54 Supplement\",\"date\":\"1884-02-16\"},{\"title\":\"The Mining Journal 1895-11-23: Vol 65 Iss 3144\",\"date\":\"1895-11-23\"},{\"title\":\"The Mining Journal January-December 1956: Vol 246-247 Index\",\"date\":\"1956-01-01\"},{\"title\":\"Mining Journal 1837: Vol 3 Supplement\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1847-06-12: Vol 17 Iss 616\",\"date\":\"1847-06-12\"},{\"title\":\"Mining Journal 1850-08-31: Vol 20 Iss 784\",\"date\":\"1850-08-31\"},{\"title\":\"Mining Journal 1850-09-07: Vol 20 Iss 785\",\"date\":\"1850-09-07\"},{\"title\":\"The Mining Journal 1853-04-23: Vol 23 Iss 922\",\"date\":\"1853-04-23\"},{\"title\":\"The Mining Journal 1854-06-17: Vol 24 Iss 982\",\"date\":\"1854-06-17\"},{\"title\":\"The Mining Journal 1854-10-14: Vol 24 Supplement\",\"date\":\"1854-10-14\"},{\"title\":\"The Mining Journal 1864-05-14: Vol 34 Iss 1499\",\"date\":\"1864-05-14\"},{\"title\":\"The Mining Journal 1864-07-30: Vol 34 Supplement\",\"date\":\"1864-07-30\"},{\"title\":\"The Mining Journal 1864-09-03: Vol 34 Iss 1515\",\"date\":\"1864-09-03\"},{\"title\":\"The Mining Journal 1864-11-26: Vol 34 Iss 1527\",\"date\":\"1864-11-26\"},{\"title\":\"The Mining Journal 1869-06-05: Vol 39 Iss 1763\",\"date\":\"1869-06-05\"},{\"title\":\"The Mining Journal 1870-08-06: Vol 40 Iss 1824\",\"date\":\"1870-08-06\"},{\"title\":\"The Mining Journal 1874-05-16: Vol 44 Iss 2021\",\"date\":\"1874-05-16\"},{\"title\":\"The Mining Journal 1877-10-20: Vol 47 Supplement\",\"date\":\"1877-10-20\"},{\"title\":\"Mining Journal 1847-12-11: Vol 17 Iss 642\",\"date\":\"1847-12-11\"},{\"title\":\"Mining Journal 1848-05-13: Vol 18 Iss 664\",\"date\":\"1848-05-13\"},{\"title\":\"Mining Journal 1846-09-12: Vol 16 Iss 577\",\"date\":\"1846-09-12\"},{\"title\":\"Mining Journal 1846-11-07: Vol 16 Iss 585\",\"date\":\"1846-11-07\"},{\"title\":\"Mining Journal 1846-12-26: Vol 16 Iss 592\",\"date\":\"1846-12-26\"},{\"title\":\"Mining Journal 1847-06-19: Vol 17 Iss 617\",\"date\":\"1847-06-19\"},{\"title\":\"Mining Journal 1851-03-01: Vol 21 Iss 810\",\"date\":\"1851-03-01\"},{\"title\":\"Mining Journal 1851-03-22: Vol 21 Iss 813\",\"date\":\"1851-03-22\"},{\"title\":\"Mining Journal 1851-12-27: Vol 21 Iss 853\",\"date\":\"1851-12-27\"},{\"title\":\"The Mining Journal 1858-09-18: Vol 28 Iss 1204\",\"date\":\"1858-09-18\"},{\"title\":\"The Mining Journal 1858-11-20: Vol 28 Iss 1213\",\"date\":\"1858-11-20\"},{\"title\":\"The Mining Journal 1859-01-29: Vol 29 Iss 1223\",\"date\":\"1859-01-29\"},{\"title\":\"The Mining Journal 1864-05-14: Vol 34 Supplement\",\"date\":\"1864-05-14\"},{\"title\":\"The Mining Journal 1864-07-02: Vol 34 Iss 1506\",\"date\":\"1864-07-02\"},{\"title\":\"The Mining Journal 1864-10-01: Vol 34 Supplement\",\"date\":\"1864-10-01\"},{\"title\":\"The Mining Journal 1864-12-03: Vol 34 Iss 1528\",\"date\":\"1864-12-03\"},{\"title\":\"The Mining Journal 1866-01-20: Vol 36 Iss 1587\",\"date\":\"1866-01-20\"},{\"title\":\"The Mining Journal 1866-08-04: Vol 36 Iss 1615\",\"date\":\"1866-08-04\"},{\"title\":\"The Mining Journal 1865-05-13: Vol 35 Iss 1551\",\"date\":\"1865-05-13\"},{\"title\":\"The Mining Journal 1867-05-18: Vol 37 Supplement\",\"date\":\"1867-05-18\"},{\"title\":\"The Mining Journal 1870-09-03: Vol 40 Supplement\",\"date\":\"1870-09-03\"},{\"title\":\"The Mining Journal 1870-09-17: Vol 40 Iss 1830\",\"date\":\"1870-09-17\"},{\"title\":\"The Mining Journal 1870-10-01: Vol 40 Iss 1832\",\"date\":\"1870-10-01\"},{\"title\":\"The Mining Journal 1877-07-21: Vol 47 Supplement\",\"date\":\"1877-07-21\"},{\"title\":\"The Mining Journal 1877-09-08: Vol 47 Supplement\",\"date\":\"1877-09-08\"},{\"title\":\"The Mining Journal 1877-09-29: Vol 47 Supplement\",\"date\":\"1877-09-29\"},{\"title\":\"The Mining Journal 1878-07-27: Vol 48 Iss 2240\",\"date\":\"1878-07-27\"},{\"title\":\"The Mining Journal 1878-08-24: Vol 48 Iss 2244\",\"date\":\"1878-08-24\"},{\"title\":\"The Mining Journal 1878-11-02: Vol 48 Iss 2254\",\"date\":\"1878-11-02\"},{\"title\":\"The Mining Journal 1878-11-16: Vol 48 Supplement\",\"date\":\"1878-11-16\"},{\"title\":\"The Mining Journal 1878-05-25: Vol 48 Supplement\",\"date\":\"1878-05-25\"},{\"title\":\"The Mining Journal 1880-04-03: Vol 50 Supplement\",\"date\":\"1880-04-03\"},{\"title\":\"The Mining Journal 1881-08-06: Vol 51 Iss 2398\",\"date\":\"1881-08-06\"},{\"title\":\"The Mining Journal 1881-08-13: Vol 51 Iss 2399\",\"date\":\"1881-08-13\"},{\"title\":\"The Mining Journal 1881-08-27: Vol 51 Iss 2401\",\"date\":\"1881-08-27\"},{\"title\":\"The Mining Journal 1883-04-07: Vol 53 Supplement\",\"date\":\"1883-04-07\"},{\"title\":\"The Mining Journal 1883-06-23: Vol 53 Iss 2496\",\"date\":\"1883-06-23\"},{\"title\":\"The Mining Journal 1894-09-01: Vol 64 Iss 3080\",\"date\":\"1894-09-01\"},{\"title\":\"The Mining Journal 1894-12-22: Vol 64 Iss 3096\",\"date\":\"1894-12-22\"},{\"title\":\"The Mining Journal 1895-02-16: Vol 65 Iss 3104\",\"date\":\"1895-02-16\"},{\"title\":\"The Mining Journal 1895-12-21: Vol 65 Iss 3148\",\"date\":\"1895-12-21\"},{\"title\":\"The Mining Journal 1896-05-09: Vol 66 Iss 3168\",\"date\":\"1896-05-09\"},{\"title\":\"The Mining Journal 1954-04-16: Vol 242 Iss 6191\",\"date\":\"1954-04-16\"},{\"title\":\"The Mining Journal Magazine 1959-04: Vol 100 Iss 4\",\"date\":\"1959-04-01\"},{\"title\":\"Mining Magazine 1969: Vol 120 Index\",\"date\":\"1969-01-01\"},{\"title\":\"Mining Journal 1995: Vol 325 Index\",\"date\":\"1995-01-01\"},{\"title\":\"Mining Journal 1839-06-15: Vol 8 Iss 199\",\"date\":\"1839-06-15\"},{\"title\":\"Mining Journal 1839-09-14: Vol 9 Iss 212\",\"date\":\"1839-09-14\"},{\"title\":\"Mining Journal 1843-10-21: Vol 13 Iss 426\",\"date\":\"1843-10-21\"},{\"title\":\"Mining Journal 1849-12-01: Vol 19 Iss 745\",\"date\":\"1849-12-01\"},{\"title\":\"Mining Journal 1849-09-01: Vol 19 Iss 732\",\"date\":\"1849-09-01\"},{\"title\":\"The Mining Journal 1854-11-11: Vol 24 Iss 1003\",\"date\":\"1854-11-11\"},{\"title\":\"The Mining Journal 1857-04-18: Vol 27 Iss 1130\",\"date\":\"1857-04-18\"},{\"title\":\"The Mining Journal 1856-05-10: Vol 26 Supplement\",\"date\":\"1856-05-10\"},{\"title\":\"The Mining Journal 1867-12-21: Vol 37 Iss 1687\",\"date\":\"1867-12-21\"},{\"title\":\"The Mining Journal 1868-04-04: Vol 38 Iss 1702\",\"date\":\"1868-04-04\"},{\"title\":\"The Mining Journal 1872-03-16: Vol 42 Supplement\",\"date\":\"1872-03-16\"},{\"title\":\"The Mining Journal 1876-01-15: Vol 46 Iss 2108\",\"date\":\"1876-01-15\"},{\"title\":\"The Mining Journal 1876-06-24: Vol 46 Supplement\",\"date\":\"1876-06-24\"},{\"title\":\"The Mining Journal 1881-04-02: Vol 51 Iss 2380\",\"date\":\"1881-04-02\"},{\"title\":\"The Mining Journal 1881-06-11: Vol 51 Iss 2390\",\"date\":\"1881-06-11\"},{\"title\":\"The Mining Journal 1884-07-12: Vol 54 Supplement\",\"date\":\"1884-07-12\"},{\"title\":\"The Mining Journal 1884-09-20: Vol 54 Supplement\",\"date\":\"1884-09-20\"},{\"title\":\"The Mining Journal 1885-01-03: Vol 55 Supplement\",\"date\":\"1885-01-03\"},{\"title\":\"The Mining Journal 1952-06-13: Vol 238 Iss 6095\",\"date\":\"1952-06-13\"},{\"title\":\"The Mining Journal 1955-03-11: Vol 244 Iss 6238\",\"date\":\"1955-03-11\"},{\"title\":\"The Mining Journal 1955-03-18: Vol 244 Iss 6239\",\"date\":\"1955-03-18\"},{\"title\":\"The Mining Journal 1958-06-13: Vol 250 Iss 6408\",\"date\":\"1958-06-13\"},{\"title\":\"The Mining Journal 1958-07-11: Vol 251 Iss 6412\",\"date\":\"1958-07-11\"},{\"title\":\"The Mining Journal 1959-10-30: Vol 253 Supplement\",\"date\":\"1959-10-30\"},{\"title\":\"The Mining Journal 1959-11-06: Vol 253 Iss 6481\",\"date\":\"1959-11-06\"},{\"title\":\"The Mining Journal 1959-11-20: Vol 253 Iss 6483\",\"date\":\"1959-11-20\"},{\"title\":\"The Mining Journal 1959-12-11: Vol 253 Iss 6486\",\"date\":\"1959-12-11\"},{\"title\":\"The Mining Journal 1959-12-25: Vol 253 Iss 6488\",\"date\":\"1959-12-25\"},{\"title\":\"Mining Journal 1836-07-23: Vol 3 Iss 48\",\"date\":\"1836-07-23\"},{\"title\":\"Mining Journal 1836: Vol 2 Index\",\"date\":\"1836-01-01\"},{\"title\":\"Mining Journal 1837-07-08: Vol 5 Iss 98\",\"date\":\"1837-07-08\"},{\"title\":\"Mining Journal 1837-07-22: Vol 5 Iss 100\",\"date\":\"1837-07-22\"},{\"title\":\"Mining Journal 1841-07-03: Vol 11 Iss 306\",\"date\":\"1841-07-03\"},{\"title\":\"Mining Journal 1841-07-17: Vol 11 Iss 308\",\"date\":\"1841-07-17\"},{\"title\":\"Mining Journal 1842-05-14: Vol 12 Iss 351\",\"date\":\"1842-05-14\"},{\"title\":\"Mining Journal 1845: Vol 15 Index\",\"date\":\"1845-01-01\"},{\"title\":\"Mining Journal 1846-05-16: Vol 16 Iss 560\",\"date\":\"1846-05-16\"},{\"title\":\"Mining Journal 1846-07-11: Vol 16 Iss 568\",\"date\":\"1846-07-11\"},{\"title\":\"Mining Journal 1852-10-30: Vol 22 Iss 897\",\"date\":\"1852-10-30\"},{\"title\":\"The Mining Journal 1861-05-25: Vol 31 Iss 1344\",\"date\":\"1861-05-25\"},{\"title\":\"The Mining Journal 1859-11-05: Vol 29 Iss 1263\",\"date\":\"1859-11-05\"},{\"title\":\"The Mining Journal 1870-08-13: Vol 40 Iss 1825\",\"date\":\"1870-08-13\"},{\"title\":\"The Mining Journal 1870-08-20: Vol 40 Supplement\",\"date\":\"1870-08-20\"},{\"title\":\"The Mining Journal 1869-07-17: Vol 39 Iss 1769\",\"date\":\"1869-07-17\"},{\"title\":\"The Mining Journal 1871-06-03: Vol 41 Iss 1867\",\"date\":\"1871-06-03\"},{\"title\":\"The Mining Journal 1873-07-26: Vol 43 Iss 1979\",\"date\":\"1873-07-26\"},{\"title\":\"The Mining Journal 1873-09-13: Vol 43 Iss 1986\",\"date\":\"1873-09-13\"},{\"title\":\"The Mining Journal 1873-09-20: Vol 43 Supplement\",\"date\":\"1873-09-20\"},{\"title\":\"The Mining Journal 1873-10-11: Vol 43 Supplement\",\"date\":\"1873-10-11\"},{\"title\":\"The Mining Journal 1873-11-29: Vol 43 Iss 1997\",\"date\":\"1873-11-29\"},{\"title\":\"The Mining Journal 1875-11-20: Vol 45 Supplement\",\"date\":\"1875-11-20\"},{\"title\":\"The Mining Journal 1876-08-19: Vol 46 Iss 2139\",\"date\":\"1876-08-19\"},{\"title\":\"The Mining Journal 1877-02-03: Vol 47 Supplement\",\"date\":\"1877-02-03\"},{\"title\":\"The Mining Journal 1879-03-08: Vol 49 Supplement\",\"date\":\"1879-03-08\"},{\"title\":\"The Mining Journal 1879-04-19: Vol 49 Supplement\",\"date\":\"1879-04-19\"},{\"title\":\"The Mining Journal 1882-06-24: Vol 52 Iss 2444\",\"date\":\"1882-06-24\"},{\"title\":\"The Mining Journal 1882-07-15: Vol 52 Iss 2447\",\"date\":\"1882-07-15\"},{\"title\":\"The Mining Journal 1952-10-31: Vol 239 Iss 6115\",\"date\":\"1952-10-31\"},{\"title\":\"The Mining Journal 1956-08-31: Vol 247 Iss 6315\",\"date\":\"1956-08-31\"},{\"title\":\"The Mining Journal 1959-07-31: Vol 253 Iss 6467\",\"date\":\"1959-07-31\"},{\"title\":\"The Mining Journal 1959-09-11: Vol 253 Iss 6473\",\"date\":\"1959-09-11\"},{\"title\":\"Mining Journal 1838: Vol 5 Supplement\",\"date\":\"1838-01-01\"},{\"title\":\"Mining Journal 1841-04-03: Vol 11 Iss 293\",\"date\":\"1841-04-03\"},{\"title\":\"Mining Journal 1844-08-31: Vol 14 Iss 471\",\"date\":\"1844-08-31\"},{\"title\":\"Mining Journal 1844-09-14: Vol 14 Iss 473\",\"date\":\"1844-09-14\"},{\"title\":\"Mining Journal 1846: Vol 16 Index\",\"date\":\"1846-01-01\"},{\"title\":\"The Mining Journal 1853-04-30: Vol 23 Iss 923\",\"date\":\"1853-04-30\"},{\"title\":\"The Mining Journal 1854-11-25: Vol 24 Supplement\",\"date\":\"1854-11-25\"},{\"title\":\"The Mining Journal 1857-03-07: Vol 27 Supplement\",\"date\":\"1857-03-07\"},{\"title\":\"The Mining Journal 1857-07-25: Vol 27 Iss 1144\",\"date\":\"1857-07-25\"},{\"title\":\"The Mining Journal 1858-10-02: Vol 28 Supplement\",\"date\":\"1858-10-02\"},{\"title\":\"The Mining Journal 1862-02-22: Vol 32 Supplement\",\"date\":\"1862-02-22\"},{\"title\":\"The Mining Journal 1867-11-16: Vol 37 Iss 1682\",\"date\":\"1867-11-16\"},{\"title\":\"The Mining Journal 1870-06-18: Vol 40 Iss 1817\",\"date\":\"1870-06-18\"},{\"title\":\"The Mining Journal 1870-07-16: Vol 40 Supplement\",\"date\":\"1870-07-16\"},{\"title\":\"The Mining Journal 1874-01-03: Vol 44 Supplement\",\"date\":\"1874-01-03\"},{\"title\":\"The Mining Journal 1875-10-23: Vol 45 Supplement\",\"date\":\"1875-10-23\"},{\"title\":\"The Mining Journal 1880-10-02: Vol 50 Iss 2354\",\"date\":\"1880-10-02\"},{\"title\":\"The Mining Journal 1883-11-24: Vol 53 Supplement\",\"date\":\"1883-11-24\"},{\"title\":\"The Mining Journal 1884-03-08: Vol 54 Supplement\",\"date\":\"1884-03-08\"},{\"title\":\"Mining Journal 1837-10-28: Vol 5 Iss 114\",\"date\":\"1837-10-28\"},{\"title\":\"Mining Journal 1839: Vol 9 Supplement\",\"date\":\"1839-01-01\"},{\"title\":\"Mining Journal 1843-11-11: Vol 13 Iss 429\",\"date\":\"1843-11-11\"},{\"title\":\"The Mining Journal 1871-02-04: Vol 41 Supplement\",\"date\":\"1871-02-04\"},{\"title\":\"The Mining Journal 1874-12-26: Vol 44 Supplement\",\"date\":\"1874-12-26\"},{\"title\":\"The Mining Journal 1877-11-17: Vol 47 Iss 2204\",\"date\":\"1877-11-17\"},{\"title\":\"The Mining Journal 1879-07-26: Vol 49 Supplement\",\"date\":\"1879-07-26\"},{\"title\":\"The Mining Journal 1883-05-26: Vol 53 Supplement\",\"date\":\"1883-05-26\"},{\"title\":\"The Mining Journal 1896-01-11: Vol 66 Iss 3151\",\"date\":\"1896-01-11\"},{\"title\":\"Mining Journal 1844-04-13: Vol 14 Iss 451\",\"date\":\"1844-04-13\"},{\"title\":\"The Mining Journal January-December 1960: Vol 254-255 Index\",\"date\":\"1960-01-01\"},{\"title\":\"Mining Journal 1839-05-25: Vol 8 Iss 196\",\"date\":\"1839-05-25\"},{\"title\":\"Mining Journal 1840-05-02: Vol 10 Iss 245\",\"date\":\"1840-05-02\"},{\"title\":\"Mining Journal 1844-05-11: Vol 14 Iss 455\",\"date\":\"1844-05-11\"},{\"title\":\"Mining Journal 1844-11-02: Vol 14 Iss 480\",\"date\":\"1844-11-02\"},{\"title\":\"The Mining Journal 1863-06-13: Vol 33 Iss 1451\",\"date\":\"1863-06-13\"},{\"title\":\"The Mining Journal 1864-08-27: Vol 34 Iss 1514\",\"date\":\"1864-08-27\"},{\"title\":\"The Mining Journal 1868-11-21: Vol 38 Iss 1735\",\"date\":\"1868-11-21\"},{\"title\":\"The Mining Journal 1882-02-25: Vol 52 Supplement\",\"date\":\"1882-02-25\"},{\"title\":\"The Mining Journal Magazine 1961-01: Vol 104 Iss 1\",\"date\":\"1961-01-01\"},{\"title\":\"The Mining Journal 1853-02-26: Vol 23 Iss 914\",\"date\":\"1853-02-26\"},{\"title\":\"The Mining Journal 1853-03-26: Vol 23 Iss 918\",\"date\":\"1853-03-26\"},{\"title\":\"The Mining Journal 1854-12-30: Vol 24 Iss 1010\",\"date\":\"1854-12-30\"},{\"title\":\"The Mining Journal 1864-01-02: Vol 34 Iss 1480\",\"date\":\"1864-01-02\"},{\"title\":\"The Mining Journal 1864-01-23: Vol 34 Supplement\",\"date\":\"1864-01-23\"},{\"title\":\"The Mining Journal 1867-06-22: Vol 37 Supplement\",\"date\":\"1867-06-22\"},{\"title\":\"The Mining Journal 1874-01-31: Vol 44 Supplement\",\"date\":\"1874-01-31\"},{\"title\":\"The Mining Journal 1874-05-02: Vol 44 Supplement\",\"date\":\"1874-05-02\"},{\"title\":\"The Mining Journal 1876-06-03: Vol 46 Supplement\",\"date\":\"1876-06-03\"},{\"title\":\"The Mining Journal 1881-04-23: Vol 51 Iss 2383\",\"date\":\"1881-04-23\"},{\"title\":\"The Mining Journal 1883-10-13: Vol 53 Iss 2512\",\"date\":\"1883-10-13\"},{\"title\":\"The Mining Journal 1896-04-25: Vol 66 Iss 3166\",\"date\":\"1896-04-25\"},{\"title\":\"The Mining Journal 1896-05-23: Vol 66 Iss 3170\",\"date\":\"1896-05-23\"},{\"title\":\"The Mining Journal 1961-10-27: Vol 257 Supplement\",\"date\":\"1961-10-27\"},{\"title\":\"Mining Journal 1977: Vol 288 Index\",\"date\":\"1977-01-01\"},{\"title\":\"Mining Journal 1835-09-05: Vol 1 Iss 2\",\"date\":\"1835-09-05\"},{\"title\":\"Mining Journal 1836-02-06: Vol 2 Iss 24\",\"date\":\"1836-02-06\"},{\"title\":\"Mining 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1627\",\"date\":\"1866-10-27\"},{\"title\":\"The Mining Journal 1866: Vol 36 Index\",\"date\":\"1866-01-01\"},{\"title\":\"The Mining Journal 1867-03-23: Vol 37 Supplement\",\"date\":\"1867-03-23\"},{\"title\":\"The Mining Journal 1867-09-28: Vol 37 Iss 1675\",\"date\":\"1867-09-28\"},{\"title\":\"The Mining Journal 1867-11-30: Vol 37 Supplement\",\"date\":\"1867-11-30\"},{\"title\":\"The Mining Journal 1869-12-25: Vol 39 Supplement\",\"date\":\"1869-12-25\"},{\"title\":\"The Mining Journal 1873-08-02: Vol 43 Iss 1980\",\"date\":\"1873-08-02\"},{\"title\":\"The Mining Journal 1873-11-01: Vol 43 Iss 1993\",\"date\":\"1873-11-01\"},{\"title\":\"The Mining Journal 1873-11-15: Vol 43 Supplement\",\"date\":\"1873-11-15\"},{\"title\":\"The Mining Journal 1874-01-10: Vol 44 Iss 2003\",\"date\":\"1874-01-10\"},{\"title\":\"The Mining Journal 1874-11-14: Vol 44 Iss 2047\",\"date\":\"1874-11-14\"},{\"title\":\"The Mining Journal 1875-02-06: Vol 45 Supplement\",\"date\":\"1875-02-06\"},{\"title\":\"The Mining Journal 1875-04-10: Vol 45 Supplement\",\"date\":\"1875-04-10\"},{\"title\":\"The Mining Journal 1875-07-24: Vol 45 Iss 2083\",\"date\":\"1875-07-24\"},{\"title\":\"The Mining Journal 1878-02-09: Vol 48 Iss 2216\",\"date\":\"1878-02-09\"},{\"title\":\"The Mining Journal 1878-04-13: Vol 48 Iss 2225\",\"date\":\"1878-04-13\"},{\"title\":\"The Mining Journal 1878-05-18: Vol 48 Supplement\",\"date\":\"1878-05-18\"},{\"title\":\"The Mining Journal 1878-08-31: Vol 48 Iss 2245\",\"date\":\"1878-08-31\"},{\"title\":\"The Mining Journal 1878-09-28: Vol 48 Iss 2249\",\"date\":\"1878-09-28\"},{\"title\":\"The Mining Journal 1879-04-12: Vol 49 Supplement\",\"date\":\"1879-04-12\"},{\"title\":\"The Mining Journal 1880-01-24: Vol 50 Iss 2318\",\"date\":\"1880-01-24\"},{\"title\":\"The Mining Journal 1880-03-13: Vol 50 Supplement\",\"date\":\"1880-03-13\"},{\"title\":\"The Mining Journal 1881-07-02: Vol 51 Supplement\",\"date\":\"1881-07-02\"},{\"title\":\"The Mining Journal 1882-02-04: Vol 52 Iss 2424\",\"date\":\"1882-02-04\"},{\"title\":\"The Mining Journal 1882-05-06: Vol 52 Iss 2437\",\"date\":\"1882-05-06\"},{\"title\":\"The Mining Journal 1884: Vol 54 Index\",\"date\":\"1884-01-01\"},{\"title\":\"The Mining Journal 1894-03-17: Vol 64 Iss 3056\",\"date\":\"1894-03-17\"},{\"title\":\"The Mining Journal 1884-02-09: Vol 54 Iss 2529\",\"date\":\"1884-02-09\"},{\"title\":\"The Mining Journal 1884-11-22: Vol 54 Iss 2570\",\"date\":\"1884-11-22\"},{\"title\":\"The Mining Journal 1956-03-09: Vol 246 Iss 6290\",\"date\":\"1956-03-09\"},{\"title\":\"The Mining Journal 1956-11-23: Vol 247 Iss 6327\",\"date\":\"1956-11-23\"},{\"title\":\"The Mining Journal 1956-12-07: Vol 247 Iss 6329\",\"date\":\"1956-12-07\"},{\"title\":\"The Mining Journal 1959-03-20: Vol 252 Iss 6448\",\"date\":\"1959-03-20\"},{\"title\":\"The Mining Journal 1959-10-09: Vol 253 Iss 6477\",\"date\":\"1959-10-09\"},{\"title\":\"The Mining Journal 1959-11-13: Vol 253 Iss 6482\",\"date\":\"1959-11-13\"},{\"title\":\"The Mining Magazine 1960-02: Vol 102 Iss 2\",\"date\":\"1960-02-01\"},{\"title\":\"The Mining Journal 1960-08-12: Vol 254 Iss 6521\",\"date\":\"1960-08-12\"},{\"title\":\"The Mining Journal 1960-11-25: Vol 254 Iss 6536\",\"date\":\"1960-11-25\"},{\"title\":\"The Mining Journal 1961-03-10: Vol 256 Iss 6551\",\"date\":\"1961-03-10\"},{\"title\":\"The Mining Journal 1961-05-05: Vol 256 Iss 6559\",\"date\":\"1961-05-05\"},{\"title\":\"Mining Journal 1837-02-11: Vol 4 Iss 77\",\"date\":\"1837-02-11\"},{\"title\":\"Mining Journal 1837-03-04: Vol 4 Iss 80\",\"date\":\"1837-03-04\"},{\"title\":\"Mining Journal 1837-10-14: Vol 5 Iss 112\",\"date\":\"1837-10-14\"},{\"title\":\"Mining Journal 1838-07-21: Vol 7 Iss 152\",\"date\":\"1838-07-21\"},{\"title\":\"Mining Journal 1841-11-06: Vol 11 Iss 324\",\"date\":\"1841-11-06\"},{\"title\":\"Mining Journal 1845-04-26: Vol 15 Iss 505\",\"date\":\"1845-04-26\"},{\"title\":\"Mining Journal 1845-05-10: Vol 15 Iss 507\",\"date\":\"1845-05-10\"},{\"title\":\"Mining Journal 1845-07-12: Vol 15 Iss 516\",\"date\":\"1845-07-12\"},{\"title\":\"Mining Journal 1846-05-09: Vol 16 Iss 559\",\"date\":\"1846-05-09\"},{\"title\":\"Mining Journal 1847-12-04: Vol 17 Iss 641\",\"date\":\"1847-12-04\"},{\"title\":\"Mining Journal 1848-04-29: Vol 18 Iss 662\",\"date\":\"1848-04-29\"},{\"title\":\"Mining Journal 1848-08-19: Vol 18 Iss 678\",\"date\":\"1848-08-19\"},{\"title\":\"Mining Journal 1850-11-09: Vol 20 Iss 794\",\"date\":\"1850-11-09\"},{\"title\":\"Mining Journal 1850-12-14: Vol 20 Iss 799\",\"date\":\"1850-12-14\"},{\"title\":\"Mining Journal 1850-12-28: Vol 20 Iss 801\",\"date\":\"1850-12-28\"},{\"title\":\"The Mining Journal 1854-05-13: Vol 24 Iss 977\",\"date\":\"1854-05-13\"},{\"title\":\"The Mining Journal 1854-12-16: Vol 24 Iss 1008\",\"date\":\"1854-12-16\"},{\"title\":\"The Mining Journal 1855-03-17: Vol 25 Iss 1021\",\"date\":\"1855-03-17\"},{\"title\":\"The Mining Journal 1862-08-16: Vol 32 Supplement\",\"date\":\"1862-08-16\"},{\"title\":\"The Mining Journal 1862-09-20: Vol 32 Iss 1413\",\"date\":\"1862-09-20\"},{\"title\":\"The Mining Journal 1862-11-15: Vol 32 Supplement\",\"date\":\"1862-11-15\"},{\"title\":\"The Mining Journal 1862-11-29: Vol 32 Iss 1423\",\"date\":\"1862-11-29\"},{\"title\":\"The Mining Journal 1864-04-09: Vol 34 Iss 1494\",\"date\":\"1864-04-09\"},{\"title\":\"The Mining Journal 1864-05-21: Vol 34 Iss 1500\",\"date\":\"1864-05-21\"},{\"title\":\"The Mining Journal 1870-07-09: Vol 40 Supplement\",\"date\":\"1870-07-09\"},{\"title\":\"The Mining Journal 1870-12-10: Vol 40 Iss 1842\",\"date\":\"1870-12-10\"},{\"title\":\"The Mining Journal 1871-04-22: Vol 41 Iss 1861\",\"date\":\"1871-04-22\"},{\"title\":\"The Mining Journal 1872-04-13: Vol 42 Iss 1912\",\"date\":\"1872-04-13\"},{\"title\":\"The Mining Journal 1872-05-18: Vol 42 Supplement\",\"date\":\"1872-05-18\"},{\"title\":\"The Mining Journal 1872-08-24: Vol 42 Iss 1931\",\"date\":\"1872-08-24\"},{\"title\":\"The Mining Journal 1872-09-28: Vol 42 Iss 1936\",\"date\":\"1872-09-28\"},{\"title\":\"The Mining Journal 1872-12-28: Vol 42 Supplement\",\"date\":\"1872-12-28\"},{\"title\":\"The Mining Journal 1876-03-04: Vol 46 Supplement\",\"date\":\"1876-03-04\"},{\"title\":\"The Mining Journal 1876-07-08: Vol 46 Iss 2133\",\"date\":\"1876-07-08\"},{\"title\":\"The Mining Journal 1876-08-19: Vol 46 Supplement\",\"date\":\"1876-08-19\"},{\"title\":\"The Mining Journal 1877-01-27: Vol 47 Iss 2162\",\"date\":\"1877-01-27\"},{\"title\":\"The Mining Journal 1877-01-27: Vol 47 Supplement\",\"date\":\"1877-01-27\"},{\"title\":\"The Mining Journal 1880-05-08: Vol 50 Iss 2333\",\"date\":\"1880-05-08\"},{\"title\":\"The Mining Journal 1880-07-03: Vol 50 Supplement\",\"date\":\"1880-07-03\"},{\"title\":\"The Mining Journal 1881-06-11: Vol 51 Supplement\",\"date\":\"1881-06-11\"},{\"title\":\"The Mining Journal 1882-10-21: Vol 52 Iss 2461\",\"date\":\"1882-10-21\"},{\"title\":\"The Mining Journal 1882-12-16: Vol 52 Supplement\",\"date\":\"1882-12-16\"},{\"title\":\"The Mining Journal 1883-01-20: Vol 53 Supplement\",\"date\":\"1883-01-20\"},{\"title\":\"The Mining Journal 1883-03-17: Vol 53 Iss 2482\",\"date\":\"1883-03-17\"},{\"title\":\"The Mining Journal 1883-08-04: Vol 53 Supplement\",\"date\":\"1883-08-04\"},{\"title\":\"The Mining Journal 1883-09-08: Vol 53 Iss 2507\",\"date\":\"1883-09-08\"},{\"title\":\"The Mining Journal 1894-10-20: Vol 64 Iss 3087\",\"date\":\"1894-10-20\"},{\"title\":\"The Mining Journal 1951-08-03: Vol 237 Iss 6050\",\"date\":\"1951-08-03\"},{\"title\":\"The Mining Journal 1951-08-17: Vol 237 Iss 6052\",\"date\":\"1951-08-17\"},{\"title\":\"The Mining Journal 1953-07-10: Vol 241 Iss 6151\",\"date\":\"1953-07-10\"},{\"title\":\"The Mining Journal 1954-03-26: Vol 242 Iss 6188\",\"date\":\"1954-03-26\"},{\"title\":\"The Mining Journal 1954-05-14: Vol 242 Iss 6195\",\"date\":\"1954-05-14\"},{\"title\":\"The Mining Journal 1955-04-01: Vol 244 Iss 6241\",\"date\":\"1955-04-01\"},{\"title\":\"The Mining Journal 1955-04-15: Vol 244 Iss 6243\",\"date\":\"1955-04-15\"},{\"title\":\"The Mining Journal 1957-09-13: Vol 249 Iss 6369\",\"date\":\"1957-09-13\"},{\"title\":\"The Mining Magazine 1958-04: Vol 98 Iss 4\",\"date\":\"1958-04-01\"},{\"title\":\"Mining Magazine - Mining Journal 1965: Vol 112-265 Index\",\"date\":\"1965-01-01\"},{\"title\":\"Mining Journal & Mining Magazine 1967: Vol 268-117 Index\",\"date\":\"1967-01-01\"},{\"title\":\"Mining Journal & Mining Magazine 1967: Vol 268-117 Index\",\"date\":\"1967-01-01\"},{\"title\":\"Mining Journal July-December 1981: Vol 297-145 Index\",\"date\":\"1981-07-01\"},{\"title\":\"Mining Journal 1835-12-19: Vol 1 Iss 17\",\"date\":\"1835-12-19\"},{\"title\":\"Mining Journal 1836-11-05: Vol 3 Iss 63\",\"date\":\"1836-11-05\"},{\"title\":\"Mining Journal 1837-01-28: Vol 4 Iss 75\",\"date\":\"1837-01-28\"},{\"title\":\"Mining Journal 1837-05-13: Vol 4 Iss 90\",\"date\":\"1837-05-13\"},{\"title\":\"Mining Journal 1838-02-24: Vol 6 Iss 131\",\"date\":\"1838-02-24\"},{\"title\":\"Mining Journal 1838-08-11: Vol 7 Iss 155\",\"date\":\"1838-08-11\"},{\"title\":\"Mining Journal 1838-09-01: Vol 7 Iss 158\",\"date\":\"1838-09-01\"},{\"title\":\"Mining Journal 1839-04-06: Vol 8 Iss 189\",\"date\":\"1839-04-06\"},{\"title\":\"Mining Journal 1844-02-24: Vol 14 Iss 444\",\"date\":\"1844-02-24\"},{\"title\":\"Mining Journal 1844-03-02: Vol 14 Iss 445\",\"date\":\"1844-03-02\"},{\"title\":\"Mining Journal 1851-12-06: Vol 21 Iss 850\",\"date\":\"1851-12-06\"},{\"title\":\"Mining Journal 1852-04-24: Vol 22 Iss 870\",\"date\":\"1852-04-24\"},{\"title\":\"Mining Journal 1852-05-29: Vol 22 Iss 875\",\"date\":\"1852-05-29\"},{\"title\":\"The Mining Journal 1854-05-20: Vol 24 Supplement\",\"date\":\"1854-05-20\"},{\"title\":\"The Mining Journal 1854-11-04: Vol 24 Iss 1002\",\"date\":\"1854-11-04\"},{\"title\":\"The Mining Journal 1855-02-10: Vol 25 Iss 1016\",\"date\":\"1855-02-10\"},{\"title\":\"The Mining Journal 1856-01-26: Vol 26 Iss 1066\",\"date\":\"1856-01-26\"},{\"title\":\"The Mining Journal 1862-12-06: Vol 32 Supplement\",\"date\":\"1862-12-06\"},{\"title\":\"The Mining Journal 1863-07-18: Vol 33 Supplement\",\"date\":\"1863-07-18\"},{\"title\":\"The Mining Journal 1863-09-12: Vol 33 Iss 1464\",\"date\":\"1863-09-12\"},{\"title\":\"The Mining Journal 1868-05-23: Vol 38 Iss 1709\",\"date\":\"1868-05-23\"},{\"title\":\"The Mining Journal 1871-10-28: Vol 41 Iss 1888\",\"date\":\"1871-10-28\"},{\"title\":\"The Mining Journal 1872-09-21: Vol 42 Supplement\",\"date\":\"1872-09-21\"},{\"title\":\"The Mining Journal 1873-03-01: Vol 43 Iss 1958\",\"date\":\"1873-03-01\"},{\"title\":\"The Mining Journal 1873-03-29: Vol 43 Iss 1962\",\"date\":\"1873-03-29\"},{\"title\":\"The Mining Journal 1875-11-13: Vol 45 Supplement\",\"date\":\"1875-11-13\"},{\"title\":\"The Mining Journal 1876-06-24: Vol 46 Iss 2131\",\"date\":\"1876-06-24\"},{\"title\":\"The Mining Journal 1876: Vol 46 Index\",\"date\":\"1876-01-01\"},{\"title\":\"The Mining Journal 1877-03-03: Vol 47 Iss 2167\",\"date\":\"1877-03-03\"},{\"title\":\"The Mining Journal 1877-09-15: Vol 47 Iss 2195\",\"date\":\"1877-09-15\"},{\"title\":\"The Mining Journal 1877-12-29: Vol 47 Iss 2210\",\"date\":\"1877-12-29\"},{\"title\":\"The Mining Journal 1881-07-02: Vol 51 Iss 2393\",\"date\":\"1881-07-02\"},{\"title\":\"The Mining Journal 1881-11-12: Vol 51 Supplement\",\"date\":\"1881-11-12\"},{\"title\":\"The Mining Journal 1882-02-04: Vol 52 Supplement\",\"date\":\"1882-02-04\"},{\"title\":\"The Mining Journal 1882-03-11: Vol 52 Iss 2429\",\"date\":\"1882-03-11\"},{\"title\":\"The Mining Journal 1885-02-07: Vol 55 Supplement\",\"date\":\"1885-02-07\"},{\"title\":\"The Mining Journal 1885-03-14: Vol 55 Iss 2586\",\"date\":\"1885-03-14\"},{\"title\":\"The Mining Journal 1951-10-26: Vol 237 Iss 6062\",\"date\":\"1951-10-26\"},{\"title\":\"The Mining Journal 1952-03-07: Vol 238 Iss 6081\",\"date\":\"1952-03-07\"},{\"title\":\"The Mining Journal 1952-03-28: Vol 238 Iss 6084\",\"date\":\"1952-03-28\"},{\"title\":\"The Mining Journal 1952-07-25: Vol 239 Iss 6101\",\"date\":\"1952-07-25\"},{\"title\":\"The Mining Journal 1952-08-29: Vol 239 Iss 6106\",\"date\":\"1952-08-29\"},{\"title\":\"The Mining Journal 1953-05-15: Vol 240 Iss 6143\",\"date\":\"1953-05-15\"},{\"title\":\"The Mining Journal 1955-04-29: Vol 244 Iss 6245\",\"date\":\"1955-04-29\"},{\"title\":\"The Mining Journal 1955-05-20: Vol 244 Iss 6248\",\"date\":\"1955-05-20\"},{\"title\":\"The Mining Journal 1955-07-29: Vol 245 Supplement\",\"date\":\"1955-07-29\"},{\"title\":\"The Mining Journal 1959-06-05: Vol 252 Iss 6459\",\"date\":\"1959-06-05\"},{\"title\":\"The Mining Journal 1959-06-05: Vol 252 Iss 6459\",\"date\":\"1959-06-05\"},{\"title\":\"The Mining Magazine 1959-09: Vol 101 Iss 3\",\"date\":\"1959-09-01\"},{\"title\":\"The Mining Journal 1960-01-29: Vol 254 Iss 6493\",\"date\":\"1960-01-29\"},{\"title\":\"Mining Journal 1841-03-13: Vol 11 Iss 290\",\"date\":\"1841-03-13\"},{\"title\":\"Mining Journal 1846-04-25: Vol 16 Iss 557\",\"date\":\"1846-04-25\"},{\"title\":\"The Mining Journal 1859-09-17: Vol 29 Iss 1256\",\"date\":\"1859-09-17\"},{\"title\":\"The Mining Journal 1862-11-08: Vol 32 Iss 1420\",\"date\":\"1862-11-08\"},{\"title\":\"The Mining Journal 1866-05-26: Vol 36 Iss 1605\",\"date\":\"1866-05-26\"},{\"title\":\"The Mining Journal 1869-02-13: Vol 39 Iss 1747\",\"date\":\"1869-02-13\"},{\"title\":\"The Mining Journal 1869: Vol 39 Index\",\"date\":\"1869-01-01\"},{\"title\":\"The Mining Journal 1874-10-31: Vol 44 Iss 2045\",\"date\":\"1874-10-31\"},{\"title\":\"The Mining Journal 1875-07-31: Vol 45 Supplement\",\"date\":\"1875-07-31\"},{\"title\":\"The Mining Journal 1878-01-05: Vol 48 Iss 2211\",\"date\":\"1878-01-05\"},{\"title\":\"The Mining Journal 1879-02-08: Vol 49 Iss 2268\",\"date\":\"1879-02-08\"},{\"title\":\"The Mining Journal 1879-02-15: Vol 49 Iss 2269\",\"date\":\"1879-02-15\"},{\"title\":\"The Mining Journal 1879-09-13: Vol 49 Supplement\",\"date\":\"1879-09-13\"},{\"title\":\"The Mining Journal 1880-11-13: Vol 50 Supplement\",\"date\":\"1880-11-13\"},{\"title\":\"The Mining Journal 1880-12-04: Vol 50 Iss 2363\",\"date\":\"1880-12-04\"},{\"title\":\"The Mining Journal 1882-11-18: Vol 52 Iss 2465\",\"date\":\"1882-11-18\"},{\"title\":\"The Mining Journal 1883-02-17: Vol 53 Iss 2478\",\"date\":\"1883-02-17\"},{\"title\":\"The Mining Journal 1883-03-03: Vol 53 Iss 2480\",\"date\":\"1883-03-03\"},{\"title\":\"The Mining Journal 1884-08-30: Vol 54 Iss 2558\",\"date\":\"1884-08-30\"},{\"title\":\"The Mining Journal 1896-07-18: Vol 66 Iss 3178\",\"date\":\"1896-07-18\"},{\"title\":\"The Mining Journal 1896-09-05: Vol 66 Iss 3185\",\"date\":\"1896-09-05\"},{\"title\":\"The Mining Journal 1954-03-19: Vol 242 Iss 6187\",\"date\":\"1954-03-19\"},{\"title\":\"The Mining Journal 1954-09-17: Vol 243 Iss 6213\",\"date\":\"1954-09-17\"},{\"title\":\"The Mining Journal 1954-09-24: Vol 243 Iss 6214\",\"date\":\"1954-09-24\"},{\"title\":\"The Mining Journal 1956-07-13: Vol 247 Iss 6308\",\"date\":\"1956-07-13\"},{\"title\":\"The Mining Journal 1956-08-24: Vol 247 Iss 6314\",\"date\":\"1956-08-24\"},{\"title\":\"The Mining Journal 1958-11-21: Vol 251 Iss 6431\",\"date\":\"1958-11-21\"},{\"title\":\"The Mining Journal 1959-04-10: Vol 252 Iss 6451\",\"date\":\"1959-04-10\"},{\"title\":\"The Mining Journal 1959-05-01: Vol 252 Iss 6454\",\"date\":\"1959-05-01\"},{\"title\":\"The Mining Journal 1960-07-15: Vol 254 Iss 6517\",\"date\":\"1960-07-15\"},{\"title\":\"The Mining Journal 1960-09-23: Vol 254 Iss 6527\",\"date\":\"1960-09-23\"},{\"title\":\"The Mining Journal 1961-03-24: Vol 256 Iss 6553\",\"date\":\"1961-03-24\"},{\"title\":\"The Mining Journal Magazine 1961-10: Vol 105 Iss 4\",\"date\":\"1961-10-01\"},{\"title\":\"Mining Journal January-June 1990: Vol 314-162 Index\",\"date\":\"1990-01-01\"},{\"title\":\"Mining Journal 1844-06-01: Vol 14 Iss 458\",\"date\":\"1844-06-01\"},{\"title\":\"The Mining Journal 1862-04-05: Vol 32 Supplement\",\"date\":\"1862-04-05\"},{\"title\":\"The Mining Journal 1875-05-29: Vol 45 Iss 2075\",\"date\":\"1875-05-29\"},{\"title\":\"The Mining Journal 1877-01-20: Vol 47 Supplement\",\"date\":\"1877-01-20\"},{\"title\":\"The Mining Journal 1880-11-27: Vol 50 Supplement\",\"date\":\"1880-11-27\"},{\"title\":\"Mining Magazine January-December 1972: Vol 126-127 Index\",\"date\":\"1972-01-01\"},{\"title\":\"Mining Journal January-June 1988: Vol 310-158 Index\",\"date\":\"1988-01-01\"},{\"title\":\"Mining Journal 1838: Vol 6 Index\",\"date\":\"1838-01-01\"},{\"title\":\"Mining Journal 1839: Vol 9 Index\",\"date\":\"1839-01-01\"},{\"title\":\"Mining Journal 1842-05-28: Vol 12 Iss 353\",\"date\":\"1842-05-28\"},{\"title\":\"The Mining Journal 1855-11-24: Vol 25 Supplement\",\"date\":\"1855-11-24\"},{\"title\":\"The Mining Journal 1862-10-11: Vol 32 Supplement\",\"date\":\"1862-10-11\"},{\"title\":\"The Mining Journal 1863-02-07: Vol 33 Iss 1433\",\"date\":\"1863-02-07\"},{\"title\":\"The Mining Journal 1871-08-12: Vol 41 Supplement\",\"date\":\"1871-08-12\"},{\"title\":\"The Mining Journal 1876-07-01: Vol 46 Supplement\",\"date\":\"1876-07-01\"},{\"title\":\"The Mining Journal 1879-05-10: Vol 49 Supplement\",\"date\":\"1879-05-10\"},{\"title\":\"The Mining Journal 1879-11-01: Vol 49 Supplement\",\"date\":\"1879-11-01\"},{\"title\":\"The Mining Journal 1881: Vol 51 Index\",\"date\":\"1881-01-01\"},{\"title\":\"The Mining Journal 1885-01-24: Vol 55 Supplement\",\"date\":\"1885-01-24\"},{\"title\":\"The Mining Magazine 1960-09: Vol 103 Iss 3\",\"date\":\"1960-09-01\"},{\"title\":\"The Mining Journal 1879-03-01: Vol 49 Supplement\",\"date\":\"1879-03-01\"},{\"title\":\"The Mining Journal 1874-12-05: Vol 44 Supplement\",\"date\":\"1874-12-05\"},{\"title\":\"Mining Journal 1836-01-09: Vol 2 Iss 20\",\"date\":\"1836-01-09\"},{\"title\":\"Mining Journal 1837-07-29: Vol 5 Iss 101\",\"date\":\"1837-07-29\"},{\"title\":\"Mining Journal 1837-12-30: Vol 5 Iss 123\",\"date\":\"1837-12-30\"},{\"title\":\"Mining Journal 1837: Vol 3 Supplement\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1838-06-23: Vol 6 Iss 148\",\"date\":\"1838-06-23\"},{\"title\":\"Mining Journal 1838-08-04: Vol 7 Iss 154\",\"date\":\"1838-08-04\"},{\"title\":\"Mining Journal 1838-12-22: Vol 7 Iss 174\",\"date\":\"1838-12-22\"},{\"title\":\"Mining Journal 1840-06-06: Vol 10 Iss 250\",\"date\":\"1840-06-06\"},{\"title\":\"Mining Journal 1841-12-11: Vol 11 Iss 329\",\"date\":\"1841-12-11\"},{\"title\":\"Mining Journal 1843-02-25: Vol 13 Iss 392\",\"date\":\"1843-02-25\"},{\"title\":\"Mining Journal 1843-05-13: Vol 13 Iss 403\",\"date\":\"1843-05-13\"},{\"title\":\"Mining Journal 1844-02-17: Vol 14 Iss 443\",\"date\":\"1844-02-17\"},{\"title\":\"Mining Journal 1845-02-01: Vol 15 Iss 493\",\"date\":\"1845-02-01\"},{\"title\":\"Mining Journal 1845-08-16: Vol 15 Iss 521\",\"date\":\"1845-08-16\"},{\"title\":\"Mining Journal 1846-04-04: Vol 16 Iss 554\",\"date\":\"1846-04-04\"},{\"title\":\"Mining Journal 1846-08-22: Vol 16 Iss 574\",\"date\":\"1846-08-22\"},{\"title\":\"Mining Journal 1846-11-14: Vol 16 Iss 586\",\"date\":\"1846-11-14\"},{\"title\":\"Mining Journal 1847-09-18: Vol 17 Iss 630\",\"date\":\"1847-09-18\"},{\"title\":\"Mining Journal 1850-01-19: Vol 20 Iss 752\",\"date\":\"1850-01-19\"},{\"title\":\"Mining Journal 1850-08-10: Vol 20 Iss 781\",\"date\":\"1850-08-10\"},{\"title\":\"Mining Journal 1852-06-19: Vol 22 Iss 878\",\"date\":\"1852-06-19\"},{\"title\":\"The Mining Journal 1854-07-29: Vol 24 Iss 988\",\"date\":\"1854-07-29\"},{\"title\":\"The Mining Journal 1854: Vol 24 Index\",\"date\":\"1854-01-01\"},{\"title\":\"The Mining Journal 1856-08-02: Vol 26 Iss 1093\",\"date\":\"1856-08-02\"},{\"title\":\"The Mining Journal 1859-07-02: Vol 29 Iss 1245\",\"date\":\"1859-07-02\"},{\"title\":\"The Mining Journal 1861-02-16: Vol 31 Iss 1330\",\"date\":\"1861-02-16\"},{\"title\":\"The Mining Journal 1861-04-20: Vol 31 Iss 1339\",\"date\":\"1861-04-20\"},{\"title\":\"The Mining Journal 1861-06-15: Vol 31 Iss 1347\",\"date\":\"1861-06-15\"},{\"title\":\"The Mining Journal 1863-01-17: Vol 33 Iss 1430\",\"date\":\"1863-01-17\"},{\"title\":\"The Mining Journal 1864-06-04: Vol 34 Iss 1502\",\"date\":\"1864-06-04\"},{\"title\":\"The Mining Journal 1864-09-10: Vol 34 Iss 1516\",\"date\":\"1864-09-10\"},{\"title\":\"The Mining Journal 1865-03-11: Vol 35 Iss 1542\",\"date\":\"1865-03-11\"},{\"title\":\"The Mining Journal 1866-11-03: Vol 36 Iss 1628\",\"date\":\"1866-11-03\"},{\"title\":\"The Mining Journal 1866-12-15: Vol 36 Iss 1634\",\"date\":\"1866-12-15\"},{\"title\":\"The Mining Journal 1867-01-26: Vol 37 Iss 1640\",\"date\":\"1867-01-26\"},{\"title\":\"The Mining Journal 1867-06-08: Vol 37 Iss 1659\",\"date\":\"1867-06-08\"},{\"title\":\"The Mining Journal 1868-01-18: Vol 38 Supplement\",\"date\":\"1868-01-18\"},{\"title\":\"The Mining Journal 1870-07-23: Vol 40 Iss 1822\",\"date\":\"1870-07-23\"},{\"title\":\"The Mining Journal 1871-03-18: Vol 41 Iss 1856\",\"date\":\"1871-03-18\"},{\"title\":\"The Mining Journal 1869-10-30: Vol 39 Iss 1784\",\"date\":\"1869-10-30\"},{\"title\":\"The Mining Journal 1869-11-06: Vol 39 Iss 1785\",\"date\":\"1869-11-06\"},{\"title\":\"The Mining Journal 1872-06-22: Vol 42 Supplement\",\"date\":\"1872-06-22\"},{\"title\":\"The Mining Journal 1872-07-20: Vol 42 Supplement\",\"date\":\"1872-07-20\"},{\"title\":\"The Mining Journal 1872-12-14: Vol 42 Supplement\",\"date\":\"1872-12-14\"},{\"title\":\"The Mining Journal 1873-01-11: Vol 43 Supplement\",\"date\":\"1873-01-11\"},{\"title\":\"The Mining Journal 1873-04-26: Vol 43 Iss 1966\",\"date\":\"1873-04-26\"},{\"title\":\"The Mining Journal 1873-07-05: Vol 43 Supplement\",\"date\":\"1873-07-05\"},{\"title\":\"The Mining Journal 1873-07-26: Vol 43 Supplement\",\"date\":\"1873-07-26\"},{\"title\":\"The Mining Journal 1874-04-18: Vol 44 Supplement\",\"date\":\"1874-04-18\"},{\"title\":\"The Mining Journal 1874-06-27: Vol 44 Supplement\",\"date\":\"1874-06-27\"},{\"title\":\"The Mining Journal 1874-08-08: Vol 44 Iss 2033\",\"date\":\"1874-08-08\"},{\"title\":\"The Mining Journal 1875-01-02: Vol 45 Iss 2054\",\"date\":\"1875-01-02\"},{\"title\":\"The Mining Journal 1875-01-23: Vol 45 Iss 2057\",\"date\":\"1875-01-23\"},{\"title\":\"The Mining Journal 1875-03-20: Vol 45 Iss 2065\",\"date\":\"1875-03-20\"},{\"title\":\"The Mining Journal 1876-06-10: Vol 46 Supplement\",\"date\":\"1876-06-10\"},{\"title\":\"The Mining Journal 1876-11-04: Vol 46 Supplement\",\"date\":\"1876-11-04\"},{\"title\":\"The Mining Journal 1877-06-23: Vol 47 Supplement\",\"date\":\"1877-06-23\"},{\"title\":\"The Mining Journal 1877-12-15: Vol 47 Iss 2208\",\"date\":\"1877-12-15\"},{\"title\":\"The Mining Journal 1879-04-29: Vol 49 Iss 2279\",\"date\":\"1879-04-29\"},{\"title\":\"The Mining Journal 1879-06-14: Vol 49 Iss 2286\",\"date\":\"1879-06-14\"},{\"title\":\"The Mining Journal 1879-07-05: Vol 49 Supplement\",\"date\":\"1879-07-05\"},{\"title\":\"The Mining Journal 1879-11-15: Vol 49 Supplement\",\"date\":\"1879-11-15\"},{\"title\":\"The Mining Journal 1880-01-17: Vol 50 Supplement\",\"date\":\"1880-01-17\"},{\"title\":\"The Mining Journal 1880-02-21: Vol 50 Supplement\",\"date\":\"1880-02-21\"},{\"title\":\"The Mining Journal 1880-03-20: Vol 50 Supplement\",\"date\":\"1880-03-20\"},{\"title\":\"The Mining Journal 1880-06-12: Vol 50 Iss 2338\",\"date\":\"1880-06-12\"},{\"title\":\"The Mining Journal 1881-07-16: Vol 51 Iss 2395\",\"date\":\"1881-07-16\"},{\"title\":\"The Mining Journal 1882-01-21: Vol 52 Iss 2422\",\"date\":\"1882-01-21\"},{\"title\":\"The Mining Journal 1882-09-16: Vol 52 Supplement\",\"date\":\"1882-09-16\"},{\"title\":\"The Mining Journal 1885-11-07: Vol 55 Iss 2620\",\"date\":\"1885-11-07\"},{\"title\":\"The Mining Journal 1885: Vol 55 Index\",\"date\":\"1885-01-01\"},{\"title\":\"The Mining Journal 1885: Vol 55 Index\",\"date\":\"1885-01-01\"},{\"title\":\"The Mining Journal 1884-01-05: Vol 54 Supplement\",\"date\":\"1884-01-05\"},{\"title\":\"The Mining Journal 1884-06-07: Vol 54 Iss 2546\",\"date\":\"1884-06-07\"},{\"title\":\"The Mining Journal 1884-11-08: Vol 54 Iss 2568\",\"date\":\"1884-11-08\"},{\"title\":\"The Mining Journal 1884-11-22: Vol 54 Supplement\",\"date\":\"1884-11-22\"},{\"title\":\"The Mining Journal 1896-08-22: Vol 66 Iss 3183\",\"date\":\"1896-08-22\"},{\"title\":\"The Mining Journal 1896-08-29: Vol 66 Iss 3184\",\"date\":\"1896-08-29\"},{\"title\":\"The Mining Journal 1951-05: Vol 236 SPECIAL ISSUE\",\"date\":\"1951-05-01\"},{\"title\":\"The Mining Journal 1952-02-22: Vol 238 Iss 6079\",\"date\":\"1952-02-22\"},{\"title\":\"The Mining Journal 1952-05-23: Vol 238 Iss 6092\",\"date\":\"1952-05-23\"},{\"title\":\"The Mining Journal 1952-08-01: Vol 239 Iss 6102\",\"date\":\"1952-08-01\"},{\"title\":\"The Mining Journal 1953-04-24: Vol 240 Iss 6140\",\"date\":\"1953-04-24\"},{\"title\":\"The Mining Journal 1953-07-17: Vol 241 Iss 6152\",\"date\":\"1953-07-17\"},{\"title\":\"The Mining Journal 1954-07-30: Vol 243 Iss 6206\",\"date\":\"1954-07-30\"},{\"title\":\"The Mining Journal 1955-06-03: Vol 244 Iss 6250\",\"date\":\"1955-06-03\"},{\"title\":\"The Mining Journal 1955-06-10: Vol 244 Iss 6251\",\"date\":\"1955-06-10\"},{\"title\":\"The Mining Journal 1955-09-16: Vol 245 Iss 6265\",\"date\":\"1955-09-16\"},{\"title\":\"The Mining Journal 1955-10-07: Vol 245 Iss 6268\",\"date\":\"1955-10-07\"},{\"title\":\"The Mining Journal 1955-11-11: Vol 245 Iss 6273\",\"date\":\"1955-11-11\"},{\"title\":\"The Mining Journal 1955-12-30: Vol 245 Iss 6280\",\"date\":\"1955-12-30\"},{\"title\":\"The Mining Journal 1956-04-20: Vol 246 Iss 6296\",\"date\":\"1956-04-20\"},{\"title\":\"The Mining Journal 1956-05-04: Vol 246 Iss 6298\",\"date\":\"1956-05-04\"},{\"title\":\"The Mining Journal 1956-09-14: Vol 247 Iss 6317\",\"date\":\"1956-09-14\"},{\"title\":\"The Mining Journal 1956-12-21: Vol 247 Iss 6331\",\"date\":\"1956-12-21\"},{\"title\":\"The Mining Journal 1957-07-12: Vol 249 Iss 6360\",\"date\":\"1957-07-12\"},{\"title\":\"The Mining Journal 1957-10-11: Vol 249 Iss 6373\",\"date\":\"1957-10-11\"},{\"title\":\"The Mining Journal 1957-12-27: Vol 249 Iss 6384\",\"date\":\"1957-12-27\"},{\"title\":\"The Mining Journal 1958-05-02: Vol 250 Iss 6402\",\"date\":\"1958-05-02\"},{\"title\":\"The Mining Journal 1958-10-10: Vol 251 Iss 6425\",\"date\":\"1958-10-10\"},{\"title\":\"The Mining Journal Magazine 1959-02: Vol 100 Iss 2\",\"date\":\"1959-02-01\"},{\"title\":\"The Mining Journal 1959-04-17: Vol 252 Iss 6452\",\"date\":\"1959-04-17\"},{\"title\":\"The Mining Journal 1959-05: Vol 252 Annual Review\",\"date\":\"1959-05-01\"},{\"title\":\"The Mining Journal 1959-10-16: Vol 253 Iss 6478\",\"date\":\"1959-10-16\"},{\"title\":\"The Mining Magazine 1960-01: Vol 102 Iss 1\",\"date\":\"1960-01-01\"},{\"title\":\"The Mining Journal 1879-01-04: Vol 49 Iss 2263\",\"date\":\"1879-01-04\"},{\"title\":\"Mining Journal 1836-07-30: Vol 3 Iss 49\",\"date\":\"1836-07-30\"},{\"title\":\"Mining Journal 1838-12-29: Vol 7 Iss 175\",\"date\":\"1838-12-29\"},{\"title\":\"Mining Journal 1841-11-20: Vol 11 Iss 326\",\"date\":\"1841-11-20\"},{\"title\":\"Mining Journal 1842-01-01: Vol 12 Iss 332\",\"date\":\"1842-01-01\"},{\"title\":\"Mining Journal 1843: Vol 13 Supplement\",\"date\":\"1843-01-01\"},{\"title\":\"Mining Journal 1842-07-16: Vol 12 Iss 360\",\"date\":\"1842-07-16\"},{\"title\":\"Mining Journal 1845-05-31: Vol 15 Iss 510\",\"date\":\"1845-05-31\"},{\"title\":\"Mining Journal 1849-12-08: Vol 19 Iss 746\",\"date\":\"1849-12-08\"},{\"title\":\"Mining Journal 1850-05-11: Vol 20 Iss 768\",\"date\":\"1850-05-11\"},{\"title\":\"Mining Journal 1845-09-20: Vol 15 Iss 526\",\"date\":\"1845-09-20\"},{\"title\":\"Mining Journal 1851-04-05: Vol 21 Iss 815\",\"date\":\"1851-04-05\"},{\"title\":\"Mining Journal 1852-01-10: Vol 22 Iss 854\",\"date\":\"1852-01-10\"},{\"title\":\"Mining Journal 1849-03-10: Vol 19 Iss 707\",\"date\":\"1849-03-10\"},{\"title\":\"The Mining Journal 1856-07-05: Vol 26 Iss 1089\",\"date\":\"1856-07-05\"},{\"title\":\"The Mining Journal 1861-05-18: Vol 31 Iss 1343\",\"date\":\"1861-05-18\"},{\"title\":\"The Mining Journal 1861-07-27: Vol 31 Iss 1353\",\"date\":\"1861-07-27\"},{\"title\":\"The Mining Journal 1861-08-17: Vol 31 Iss 1356\",\"date\":\"1861-08-17\"},{\"title\":\"The Mining Journal 1858-01-09: Vol 28 Iss 1168\",\"date\":\"1858-01-09\"},{\"title\":\"The Mining Journal 1858-05-29: Vol 28 Iss 1188\",\"date\":\"1858-05-29\"},{\"title\":\"The Mining Journal 1863-10-03: Vol 33 Supplement\",\"date\":\"1863-10-03\"},{\"title\":\"The Mining Journal 1863: Vol 33 Index\",\"date\":\"1863-01-01\"},{\"title\":\"The Mining Journal 1864-02-13: Vol 34 Supplement\",\"date\":\"1864-02-13\"},{\"title\":\"The Mining Journal 1864-03-26: Vol 34 Iss 1492\",\"date\":\"1864-03-26\"},{\"title\":\"The Mining Journal 1864-06-25: Vol 34 Iss 1505\",\"date\":\"1864-06-25\"},{\"title\":\"The Mining Journal 1864-07-23: Vol 34 Iss 1509\",\"date\":\"1864-07-23\"},{\"title\":\"The Mining Journal 1870-04-23: Vol 40 Iss 1809\",\"date\":\"1870-04-23\"},{\"title\":\"The Mining Journal 1870-09-03: Vol 40 Iss 1828\",\"date\":\"1870-09-03\"},{\"title\":\"The Mining Journal 1869-06-26: Vol 39 Supplement\",\"date\":\"1869-06-26\"},{\"title\":\"The Mining Journal 1869-12-11: Vol 39 Iss 1790\",\"date\":\"1869-12-11\"},{\"title\":\"The Mining Journal 1870-01-01: Vol 40 Supplement\",\"date\":\"1870-01-01\"},{\"title\":\"The Mining Journal 1868: Vol 38 Index\",\"date\":\"1868-01-01\"},{\"title\":\"The Mining Journal 1870-11-12: Vol 40 Iss 1838\",\"date\":\"1870-11-12\"},{\"title\":\"The Mining Journal 1871-02-25: Vol 41 Supplement\",\"date\":\"1871-02-25\"},{\"title\":\"The Mining Journal 1871-08-05: Vol 41 Supplement\",\"date\":\"1871-08-05\"},{\"title\":\"The Mining Journal 1871-09-09: Vol 41 Supplement\",\"date\":\"1871-09-09\"},{\"title\":\"The Mining Journal 1873-06-28: Vol 43 Iss 1975\",\"date\":\"1873-06-28\"},{\"title\":\"The Mining Journal 1874-09-26: Vol 44 Supplement\",\"date\":\"1874-09-26\"},{\"title\":\"The Mining Journal 1874-04-04: Vol 44 Iss 2015\",\"date\":\"1874-04-04\"},{\"title\":\"The Mining Journal 1874-06-20: Vol 44 Supplement\",\"date\":\"1874-06-20\"},{\"title\":\"The Mining Journal 1874-06-27: Vol 44 Iss 2027\",\"date\":\"1874-06-27\"},{\"title\":\"The Mining Journal 1874-08-22: Vol 44 Supplement\",\"date\":\"1874-08-22\"},{\"title\":\"The Mining Journal 1876-07-08: Vol 46 Supplement\",\"date\":\"1876-07-08\"},{\"title\":\"The Mining Journal 1878-07-20: Vol 48 Supplement\",\"date\":\"1878-07-20\"},{\"title\":\"The Mining Journal 1879-09-20: Vol 49 Iss 2300\",\"date\":\"1879-09-20\"},{\"title\":\"The Mining Journal 1882-05-13: Vol 52 Iss 2438\",\"date\":\"1882-05-13\"},{\"title\":\"The Mining Journal 1880-06-19: Vol 50 Supplement\",\"date\":\"1880-06-19\"},{\"title\":\"The Mining Journal 1884-10-25: Vol 54 Supplement\",\"date\":\"1884-10-25\"},{\"title\":\"The Mining Journal 1885-10-10: Vol 55 Iss 2616\",\"date\":\"1885-10-10\"},{\"title\":\"The Mining Journal 1894-06-23: Vol 64 Iss 3070\",\"date\":\"1894-06-23\"},{\"title\":\"The Mining Journal 1894-11-24: Vol 64 Iss 3092\",\"date\":\"1894-11-24\"},{\"title\":\"The Mining Journal 1952-04-04: Vol 238 Iss 6085\",\"date\":\"1952-04-04\"},{\"title\":\"The Mining Journal 1959-01-23: Vol 252 Iss 6440\",\"date\":\"1959-01-23\"},{\"title\":\"The Mining Journal 1960-09-30: Vol 254 Iss 6528\",\"date\":\"1960-09-30\"},{\"title\":\"The Mining Journal 1960-10-14: Vol 254 Iss 6530\",\"date\":\"1960-10-14\"},{\"title\":\"The Mining Journal 1960-12-16: Vol 254 Iss 6539\",\"date\":\"1960-12-16\"},{\"title\":\"The Mining Journal Magazine 1959-08: Vol 101 Iss 2\",\"date\":\"1959-08-01\"},{\"title\":\"Mining Journal 1837-04-29: Vol 4 Iss 88\",\"date\":\"1837-04-29\"},{\"title\":\"Mining Journal 1837-11-25: Vol 5 Iss 118\",\"date\":\"1837-11-25\"},{\"title\":\"Mining Journal 1848-02-12: Vol 18 Iss 651\",\"date\":\"1848-02-12\"},{\"title\":\"Mining Journal 1848-02-19: Vol 18 Iss 652\",\"date\":\"1848-02-19\"},{\"title\":\"Mining Journal 1848-06-03: Vol 18 Iss 667\",\"date\":\"1848-06-03\"},{\"title\":\"Mining Journal 1848-10-28: Vol 18 Iss 688\",\"date\":\"1848-10-28\"},{\"title\":\"Mining Journal 1848-12-02: Vol 18 Iss 693\",\"date\":\"1848-12-02\"},{\"title\":\"Mining Journal 1847-04-24: Vol 17 Iss 609\",\"date\":\"1847-04-24\"},{\"title\":\"Mining Journal 1847-07-31: Vol 17 Iss 623\",\"date\":\"1847-07-31\"},{\"title\":\"Mining Journal 1847-10-09: Vol 17 Iss 633\",\"date\":\"1847-10-09\"},{\"title\":\"Mining Journal 1847-10-16: Vol 17 Iss 634\",\"date\":\"1847-10-16\"},{\"title\":\"Mining Journal 1847-10-23: Vol 17 Iss 635\",\"date\":\"1847-10-23\"},{\"title\":\"Mining Journal 1840-11-21: Vol 10 Iss 274\",\"date\":\"1840-11-21\"},{\"title\":\"Mining Journal 1852-06-05: Vol 22 Iss 876\",\"date\":\"1852-06-05\"},{\"title\":\"Mining Journal 1852-10-23: Vol 22 Iss 896\",\"date\":\"1852-10-23\"},{\"title\":\"The Mining Journal 1856-04-26: Vol 26 Iss 1079\",\"date\":\"1856-04-26\"},{\"title\":\"The Mining Journal 1856-06-07: Vol 26 Supplement\",\"date\":\"1856-06-07\"},{\"title\":\"The Mining Journal 1858-07-24: Vol 28 Iss 1196\",\"date\":\"1858-07-24\"},{\"title\":\"The Mining Journal 1858-11-06: Vol 28 Iss 1211\",\"date\":\"1858-11-06\"},{\"title\":\"The Mining Journal 1859-04-02: Vol 29 Supplement\",\"date\":\"1859-04-02\"},{\"title\":\"The Mining Journal 1865-12-02: Vol 35 Iss 1580\",\"date\":\"1865-12-02\"},{\"title\":\"The Mining Journal 1865-05-06: Vol 35 Iss 1550\",\"date\":\"1865-05-06\"},{\"title\":\"The Mining Journal 1867-12-14: Vol 37 Supplement\",\"date\":\"1867-12-14\"},{\"title\":\"The Mining Journal 1867-06-01: Vol 37 Supplement\",\"date\":\"1867-06-01\"},{\"title\":\"The Mining Journal 1867-07-13: Vol 37 Iss 1664\",\"date\":\"1867-07-13\"},{\"title\":\"The Mining Journal 1872-01-13: Vol 42 Iss 1899\",\"date\":\"1872-01-13\"},{\"title\":\"The Mining Journal 1872-03-23: Vol 42 Supplement\",\"date\":\"1872-03-23\"},{\"title\":\"The Mining Journal 1872-06-08: Vol 42 Iss 1920\",\"date\":\"1872-06-08\"},{\"title\":\"The Mining Journal 1872-08-03: Vol 42 Supplement\",\"date\":\"1872-08-03\"},{\"title\":\"The Mining Journal 1872-10-26: Vol 42 Supplement\",\"date\":\"1872-10-26\"},{\"title\":\"The Mining Journal 1873-09-27: Vol 43 Supplement\",\"date\":\"1873-09-27\"},{\"title\":\"The Mining Journal 1875-06-26: Vol 45 Supplement\",\"date\":\"1875-06-26\"},{\"title\":\"The Mining Journal 1875-11-13: Vol 45 Iss 2099\",\"date\":\"1875-11-13\"},{\"title\":\"The Mining Journal 1877-05-26: Vol 47 Supplement\",\"date\":\"1877-05-26\"},{\"title\":\"The Mining Journal 1876-12-30: Vol 46 Iss 2158\",\"date\":\"1876-12-30\"},{\"title\":\"The Mining Journal 1881-03-19: Vol 51 Supplement\",\"date\":\"1881-03-19\"},{\"title\":\"The Mining Journal 1879-10-18: Vol 49 Iss 2304\",\"date\":\"1879-10-18\"},{\"title\":\"The Mining Journal 1880-01-10: Vol 50 Supplement\",\"date\":\"1880-01-10\"},{\"title\":\"The Mining Journal 1881-10-22: Vol 51 Supplement\",\"date\":\"1881-10-22\"},{\"title\":\"The Mining Journal 1883-08-25: Vol 53 Iss 2505\",\"date\":\"1883-08-25\"},{\"title\":\"The Mining Journal 1885-02-07: Vol 55 Iss 2581\",\"date\":\"1885-02-07\"},{\"title\":\"The Mining Journal 1885-02-14: Vol 55 Iss 2582\",\"date\":\"1885-02-14\"},{\"title\":\"The Mining Journal 1885-05-02: Vol 55 Iss 2593\",\"date\":\"1885-05-02\"},{\"title\":\"The Mining Journal 1885-05-16: Vol 55 Iss 2595\",\"date\":\"1885-05-16\"},{\"title\":\"The Mining Journal 1896-01-18: Vol 66 Iss 3152\",\"date\":\"1896-01-18\"},{\"title\":\"The Mining Journal 1954-12-31: Vol 243 Iss 6228\",\"date\":\"1954-12-31\"},{\"title\":\"The Mining Journal 1956-09-28: Vol 247 Iss 6319\",\"date\":\"1956-09-28\"},{\"title\":\"The Mining Journal 1956-11-02: Vol 247 Iss 6324A\",\"date\":\"1956-11-02\"},{\"title\":\"The Mining Journal 1957-05-17: Vol 248 Iss 6352\",\"date\":\"1957-05-17\"},{\"title\":\"The Mining Journal 1959-02-20: Vol 252 Iss 6444\",\"date\":\"1959-02-20\"},{\"title\":\"Mining Journal July-December 1991: Vol 317-165 Index\",\"date\":\"1991-07-01\"},{\"title\":\"Mining Journal 1837-04-15: Vol 4 Iss 86\",\"date\":\"1837-04-15\"},{\"title\":\"Mining Journal 1837-08-12: Vol 5 Iss 103\",\"date\":\"1837-08-12\"},{\"title\":\"Mining Journal 1840-12-12: Vol 10 Iss 277\",\"date\":\"1840-12-12\"},{\"title\":\"Mining Journal 1843-01-28: Vol 13 Iss 388\",\"date\":\"1843-01-28\"},{\"title\":\"Mining Journal 1843-07-01: Vol 13 Iss 410\",\"date\":\"1843-07-01\"},{\"title\":\"Mining Journal 1843-08-19: Vol 13 Iss 417\",\"date\":\"1843-08-19\"},{\"title\":\"Mining Journal 1844-12-21: Vol 14 Iss 487\",\"date\":\"1844-12-21\"},{\"title\":\"Mining Journal 1845-07-26: Vol 15 Iss 518\",\"date\":\"1845-07-26\"},{\"title\":\"Mining Journal 1851-11-15: Vol 21 Iss 847\",\"date\":\"1851-11-15\"},{\"title\":\"Mining Journal 1852-05-15: Vol 22 Iss 873\",\"date\":\"1852-05-15\"},{\"title\":\"Mining Journal 1852-07-24: Vol 22 Iss 883\",\"date\":\"1852-07-24\"},{\"title\":\"The Mining Journal 1856-12-27: Vol 26 Iss 1114\",\"date\":\"1856-12-27\"},{\"title\":\"The Mining Journal 1858-08-07: Vol 28 Iss 1198\",\"date\":\"1858-08-07\"},{\"title\":\"The Mining Journal 1866-06-16: Vol 36 Iss 1608\",\"date\":\"1866-06-16\"},{\"title\":\"The Mining Journal 1866-11-10: Vol 36 Iss 1629\",\"date\":\"1866-11-10\"},{\"title\":\"The Mining Journal 1870-07-16: Vol 40 Iss 1821\",\"date\":\"1870-07-16\"},{\"title\":\"The Mining Journal 1871-03-04: Vol 41 Iss 1854\",\"date\":\"1871-03-04\"},{\"title\":\"The Mining Journal 1871-06-03: Vol 41 Supplement\",\"date\":\"1871-06-03\"},{\"title\":\"The Mining Journal 1869-03-20: Vol 39 Iss 1752\",\"date\":\"1869-03-20\"},{\"title\":\"The Mining Journal 1869-04-17: Vol 39 Iss 1756\",\"date\":\"1869-04-17\"},{\"title\":\"The Mining Journal 1872-03-30: Vol 42 Iss 1910\",\"date\":\"1872-03-30\"},{\"title\":\"The Mining Journal 1872-09-21: Vol 42 Iss 1935\",\"date\":\"1872-09-21\"},{\"title\":\"The Mining Journal 1872-11-16: Vol 42 Supplement\",\"date\":\"1872-11-16\"},{\"title\":\"The Mining Journal 1873-03-08: Vol 43 Iss 1959\",\"date\":\"1873-03-08\"},{\"title\":\"The Mining Journal 1873-07-05: Vol 43 Iss 1976\",\"date\":\"1873-07-05\"},{\"title\":\"The Mining Journal 1873-09-20: Vol 43 Iss 1987\",\"date\":\"1873-09-20\"},{\"title\":\"The Mining Journal 1873-10-25: Vol 43 Iss 1992\",\"date\":\"1873-10-25\"},{\"title\":\"The Mining Journal 1874-02-07: Vol 44 Supplement\",\"date\":\"1874-02-07\"},{\"title\":\"The Mining Journal 1875-10-09: Vol 45 Supplement\",\"date\":\"1875-10-09\"},{\"title\":\"The Mining Journal 1876-01-22: Vol 46 Supplement\",\"date\":\"1876-01-22\"},{\"title\":\"The Mining Journal 1876-02-19: Vol 46 Iss 2113\",\"date\":\"1876-02-19\"},{\"title\":\"The Mining Journal 1876-05-27: Vol 46 Iss 2127\",\"date\":\"1876-05-27\"},{\"title\":\"The Mining Journal 1876-09-30: Vol 46 Supplement\",\"date\":\"1876-09-30\"},{\"title\":\"The Mining Journal 1876-10-28: Vol 46 Iss 2149\",\"date\":\"1876-10-28\"},{\"title\":\"The Mining Journal 1876-12-09: Vol 46 Iss 2155\",\"date\":\"1876-12-09\"},{\"title\":\"The Mining Journal 1877-03-24: Vol 47 Supplement\",\"date\":\"1877-03-24\"},{\"title\":\"The Mining Journal 1879-10-25: Vol 49 Iss 2305\",\"date\":\"1879-10-25\"},{\"title\":\"The Mining Journal 1879-12-13: Vol 49 Iss 2312\",\"date\":\"1879-12-13\"},{\"title\":\"The Mining Journal 1880-02-14: Vol 50 Iss 2321\",\"date\":\"1880-02-14\"},{\"title\":\"The Mining Journal 1881-02-12: Vol 51 Supplement\",\"date\":\"1881-02-12\"},{\"title\":\"The Mining Journal 1881-02-19: Vol 51 Iss 2374\",\"date\":\"1881-02-19\"},{\"title\":\"The Mining Journal 1882-05-27: Vol 52 Supplement\",\"date\":\"1882-05-27\"},{\"title\":\"The Mining Journal 1882-08-26: Vol 52 Supplement\",\"date\":\"1882-08-26\"},{\"title\":\"The Mining Journal 1885-01-17: Vol 55 Iss 2578\",\"date\":\"1885-01-17\"},{\"title\":\"The Mining Journal 1952-09-05: Vol 239 Iss 6107\",\"date\":\"1952-09-05\"},{\"title\":\"The Mining Journal 1952-11-14: Vol 239 Iss 6117\",\"date\":\"1952-11-14\"},{\"title\":\"The Mining Journal 1953-03-06: Vol 240 Iss 6133\",\"date\":\"1953-03-06\"},{\"title\":\"The Mining Journal 1953-04-03: Vol 240 Iss 6137\",\"date\":\"1953-04-03\"},{\"title\":\"The Mining Journal 1953-04-17: Vol 240 Iss 6139\",\"date\":\"1953-04-17\"},{\"title\":\"The Mining Journal 1953-05-22: Vol 240 Iss 6144\",\"date\":\"1953-05-22\"},{\"title\":\"The Mining Journal 1953-06-05: Vol 240 Iss 6146\",\"date\":\"1953-06-05\"},{\"title\":\"The Mining Journal 1956-07-06: Vol 247 Iss 6307\",\"date\":\"1956-07-06\"},{\"title\":\"The Mining Journal 1957-04-19: Vol 248 Iss 6348\",\"date\":\"1957-04-19\"},{\"title\":\"The Mining Journal 1958-10-24: Vol 251 Iss 6427\",\"date\":\"1958-10-24\"},{\"title\":\"The Mining Journal 1958-12-12: Vol 251 Iss 6434\",\"date\":\"1958-12-12\"},{\"title\":\"The Mining Journal 1958-12-26: Vol 251 Iss 6436\",\"date\":\"1958-12-26\"},{\"title\":\"The Mining Journal 1959-02-27: Vol 252 Iss 6445\",\"date\":\"1959-02-27\"},{\"title\":\"The Mining Journal 1960-05: Vol 254 Annual Review\",\"date\":\"1960-05-01\"},{\"title\":\"The Mining Journal 1961-07-21: Vol 257 Iss 6570\",\"date\":\"1961-07-21\"},{\"title\":\"Mining Journal 1836-04-02: Vol 2 Iss 32\",\"date\":\"1836-04-02\"},{\"title\":\"Mining Journal 1836-08-06: Vol 3 Iss 50\",\"date\":\"1836-08-06\"},{\"title\":\"Mining Journal 1838-11-24: Vol 7 Iss 170\",\"date\":\"1838-11-24\"},{\"title\":\"Mining Journal 1839: Vol 8 Index\",\"date\":\"1839-01-01\"},{\"title\":\"Mining Journal 1849-11-10: Vol 19 Iss 742\",\"date\":\"1849-11-10\"},{\"title\":\"Mining Journal 1850-01-12: Vol 20 Iss 751\",\"date\":\"1850-01-12\"},{\"title\":\"Mining Journal 1850-04-27: Vol 20 Iss 766\",\"date\":\"1850-04-27\"},{\"title\":\"The Mining Journal 1855-01-20: Vol 25 Iss 1013\",\"date\":\"1855-01-20\"},{\"title\":\"The Mining Journal 1859-12-31: Vol 29 Iss 1271\",\"date\":\"1859-12-31\"},{\"title\":\"The Mining Journal 1861-05-11: Vol 31 Supplement\",\"date\":\"1861-05-11\"},{\"title\":\"The Mining Journal 1861-06-01: Vol 31 Iss 1345\",\"date\":\"1861-06-01\"},{\"title\":\"The Mining Journal 1862-05-24: Vol 32 Iss 1396\",\"date\":\"1862-05-24\"},{\"title\":\"The Mining Journal 1862-09-27: Vol 32 Iss 1414\",\"date\":\"1862-09-27\"},{\"title\":\"The Mining Journal 1863-08-15: Vol 33 Supplement\",\"date\":\"1863-08-15\"},{\"title\":\"The Mining Journal 1865-01-21: Vol 35 Iss 1535\",\"date\":\"1865-01-21\"},{\"title\":\"The Mining Journal 1865-06-17: Vol 35 Iss 1556\",\"date\":\"1865-06-17\"},{\"title\":\"The Mining Journal 1867-08-24: Vol 37 Iss 1670\",\"date\":\"1867-08-24\"},{\"title\":\"The Mining Journal 1868-05-30: Vol 38 Iss 1710\",\"date\":\"1868-05-30\"},{\"title\":\"The Mining Journal 1868-10-24: Vol 38 Iss 1731\",\"date\":\"1868-10-24\"},{\"title\":\"The Mining Journal 1875-04-17: Vol 45 Supplement\",\"date\":\"1875-04-17\"},{\"title\":\"The Mining Journal 1878-11-09: Vol 48 Iss 2255\",\"date\":\"1878-11-09\"},{\"title\":\"The Mining Journal 1883-02-03: Vol 53 Supplement\",\"date\":\"1883-02-03\"},{\"title\":\"The Mining Journal 1883-03-10: Vol 53 Iss 2481\",\"date\":\"1883-03-10\"},{\"title\":\"The Mining Journal 1884-03-29: Vol 54 Supplement\",\"date\":\"1884-03-29\"},{\"title\":\"The Mining Journal 1884-05-17: Vol 54 Supplement\",\"date\":\"1884-05-17\"},{\"title\":\"The Mining Journal 1894-12-15: Vol 64 Iss 3095\",\"date\":\"1894-12-15\"},{\"title\":\"The Mining Journal 1895-10-19: Vol 65 Iss 3139\",\"date\":\"1895-10-19\"},{\"title\":\"The Mining Journal 1896-03-14: Vol 66 Iss 3160\",\"date\":\"1896-03-14\"},{\"title\":\"The Mining Journal 1951-05-04: Vol 236 Iss 6037\",\"date\":\"1951-05-04\"},{\"title\":\"The Mining Journal 1952-01-18: Vol 238 Iss 6074\",\"date\":\"1952-01-18\"},{\"title\":\"The Mining Journal 1953-10-30: Vol 241 Iss 6167\",\"date\":\"1953-10-30\"},{\"title\":\"The Mining Journal 1954-03-12: Vol 242 Iss 6186\",\"date\":\"1954-03-12\"},{\"title\":\"The Mining Journal 1954-08-13: Vol 243 Iss 6208\",\"date\":\"1954-08-13\"},{\"title\":\"The Mining Journal 1955-04-22: Vol 244 Iss 6244\",\"date\":\"1955-04-22\"},{\"title\":\"The Mining Journal 1955-07-22: Vol 245 Iss 6257\",\"date\":\"1955-07-22\"},{\"title\":\"The Mining Journal 1955-11-18: Vol 245 Iss 6274\",\"date\":\"1955-11-18\"},{\"title\":\"The Mining Journal 1955-12-09: Vol 245 Iss 6277\",\"date\":\"1955-12-09\"},{\"title\":\"The Mining Journal 1956-02-24: Vol 246 Iss 6288\",\"date\":\"1956-02-24\"},{\"title\":\"The Mining Journal 1958-01-24: Vol 250 Iss 6388\",\"date\":\"1958-01-24\"},{\"title\":\"The Mining Journal 1958-04-25: Vol 250 Iss 6401\",\"date\":\"1958-04-25\"},{\"title\":\"The Mining Journal 1958-08-15: Vol 251 Iss 6417\",\"date\":\"1958-08-15\"},{\"title\":\"Mining Journal & Mining Magazine 1967: Vol 268-117 Index\",\"date\":\"1967-01-01\"},{\"title\":\"Mining Journal July-December 1987: Vol 309-157 Index\",\"date\":\"1987-07-01\"},{\"title\":\"Mining Journal 1836: Vol 3 Supplement\",\"date\":\"1836-01-01\"},{\"title\":\"Mining Journal 1838-03-10: Vol 6 Iss 133\",\"date\":\"1838-03-10\"},{\"title\":\"Mining Journal 1838-03-31: Vol 6 Iss 136\",\"date\":\"1838-03-31\"},{\"title\":\"Mining Journal 1839-04-27: Vol 8 Iss 192\",\"date\":\"1839-04-27\"},{\"title\":\"Mining Journal 1839-06-01: Vol 8 Iss 197\",\"date\":\"1839-06-01\"},{\"title\":\"Mining Journal 1845-02-22: Vol 15 Iss 496\",\"date\":\"1845-02-22\"},{\"title\":\"Mining Journal 1845-03-15: Vol 15 Iss 499\",\"date\":\"1845-03-15\"},{\"title\":\"Mining Journal 1845-11-29: Vol 15 Iss 536\",\"date\":\"1845-11-29\"},{\"title\":\"Mining Journal 1845-12-20: Vol 15 Iss 539\",\"date\":\"1845-12-20\"},{\"title\":\"Mining Journal 1846-03-21: Vol 16 Iss 552\",\"date\":\"1846-03-21\"},{\"title\":\"Mining Journal 1846-05-23: Vol 16 Iss 561\",\"date\":\"1846-05-23\"},{\"title\":\"Mining Journal 1847-02-13: Vol 17 Iss 599\",\"date\":\"1847-02-13\"},{\"title\":\"Mining Journal 1847-07-24: Vol 17 Iss 622\",\"date\":\"1847-07-24\"},{\"title\":\"Mining Journal 1847-08-14: Vol 17 Iss 625\",\"date\":\"1847-08-14\"},{\"title\":\"Mining Journal 1849-02-10: Vol 19 Iss 703\",\"date\":\"1849-02-10\"},{\"title\":\"Mining Journal 1852-10-02: Vol 22 Iss 893\",\"date\":\"1852-10-02\"},{\"title\":\"The Mining Journal 1861-06-08: Vol 31 Iss 1346\",\"date\":\"1861-06-08\"},{\"title\":\"The Mining Journal 1862-01-25: Vol 32 Iss 1379\",\"date\":\"1862-01-25\"},{\"title\":\"The Mining Journal 1870-12-31: Vol 40 Iss 1845\",\"date\":\"1870-12-31\"},{\"title\":\"The Mining Journal 1871-03-11: Vol 41 Supplement\",\"date\":\"1871-03-11\"},{\"title\":\"The Mining Journal 1871-04-01: Vol 41 Iss 1858\",\"date\":\"1871-04-01\"},{\"title\":\"The Mining Journal 1871-04-29: Vol 41 Supplement\",\"date\":\"1871-04-29\"},{\"title\":\"The Mining Journal 1871-07-22: Vol 41 Supplement\",\"date\":\"1871-07-22\"},{\"title\":\"The Mining Journal 1872-11-16: Vol 42 Iss 1943\",\"date\":\"1872-11-16\"},{\"title\":\"The Mining Journal 1872: Vol 42 Index\",\"date\":\"1872-01-01\"},{\"title\":\"The Mining Journal 1873-02-22: Vol 43 Iss 1957\",\"date\":\"1873-02-22\"},{\"title\":\"The Mining Journal 1874-11-28: Vol 44 Iss 2049\",\"date\":\"1874-11-28\"},{\"title\":\"The Mining Journal 1875-05-08: Vol 45 Iss 2072\",\"date\":\"1875-05-08\"},{\"title\":\"The Mining Journal 1875-07-10: Vol 45 Iss 2081\",\"date\":\"1875-07-10\"},{\"title\":\"The Mining Journal 1875-09-18: Vol 45 Supplement\",\"date\":\"1875-09-18\"},{\"title\":\"The Mining Journal 1876-01-08: Vol 46 Iss 2107\",\"date\":\"1876-01-08\"},{\"title\":\"The Mining Journal 1876-03-11: Vol 46 Iss 2116\",\"date\":\"1876-03-11\"},{\"title\":\"The Mining Journal 1876-04-01: Vol 46 Supplement\",\"date\":\"1876-04-01\"},{\"title\":\"The Mining Journal 1876-05-20: Vol 46 Supplement\",\"date\":\"1876-05-20\"},{\"title\":\"The Mining Journal 1876-09-30: Vol 46 Iss 2145\",\"date\":\"1876-09-30\"},{\"title\":\"The Mining Journal 1877-02-03: Vol 47 Iss 2163\",\"date\":\"1877-02-03\"},{\"title\":\"The Mining Journal 1877-06-02: Vol 47 Iss 2180\",\"date\":\"1877-06-02\"},{\"title\":\"The Mining Journal 1877-08-11: Vol 47 Supplement\",\"date\":\"1877-08-11\"},{\"title\":\"The Mining Journal 1877-09-22: Vol 47 Iss 2196\",\"date\":\"1877-09-22\"},{\"title\":\"The Mining Journal 1880-05-15: Vol 50 Supplement\",\"date\":\"1880-05-15\"},{\"title\":\"The Mining Journal 1880-07-03: Vol 50 Iss 2341\",\"date\":\"1880-07-03\"},{\"title\":\"The Mining Journal 1880-10-09: Vol 50 Iss 2355\",\"date\":\"1880-10-09\"},{\"title\":\"The Mining Journal 1882-11-11: Vol 52 Iss 2464\",\"date\":\"1882-11-11\"},{\"title\":\"The Mining Journal 1885-02-21: Vol 55 Iss 2583\",\"date\":\"1885-02-21\"},{\"title\":\"The Mining Journal 1885-02-28: Vol 55 Iss 2584\",\"date\":\"1885-02-28\"},{\"title\":\"The Mining Journal 1885-12-26: Vol 55 Iss 2627\",\"date\":\"1885-12-26\"},{\"title\":\"The Mining Journal 1884-01-12: Vol 54 Supplement\",\"date\":\"1884-01-12\"},{\"title\":\"The Mining Journal 1884-01-19: Vol 54 Supplement\",\"date\":\"1884-01-19\"},{\"title\":\"The Mining Journal 1884-03-29: Vol 54 Iss 2536\",\"date\":\"1884-03-29\"},{\"title\":\"The Mining Journal 1951-06-08: Vol 236 Iss 6042\",\"date\":\"1951-06-08\"},{\"title\":\"The Mining Journal 1953-11-20: Vol 241 Iss 6170\",\"date\":\"1953-11-20\"},{\"title\":\"The Mining Journal 1954-01-08: Vol 242 Iss 6177\",\"date\":\"1954-01-08\"},{\"title\":\"The Mining Journal 1954-02-26: Vol 242 Iss 6184\",\"date\":\"1954-02-26\"},{\"title\":\"The Mining Journal 1954-04-02: Vol 242 Iss 6189\",\"date\":\"1954-04-02\"},{\"title\":\"The Mining Journal 1954-07-02: Vol 243 Iss 6202\",\"date\":\"1954-07-02\"},{\"title\":\"The Mining Magazine 1960-11: Vol 103 Iss 5\",\"date\":\"1960-11-01\"},{\"title\":\"The Mining Journal 1961-02-17: Vol 256 Iss 6548\",\"date\":\"1961-02-17\"},{\"title\":\"The Mining Journal 1961-05-26: Vol 256 Iss 6562\",\"date\":\"1961-05-26\"},{\"title\":\"The Mining Journal 1961-12-22: Vol 257 Iss 6592\",\"date\":\"1961-12-22\"},{\"title\":\"The Mining Journal January-December 1957: Vol 248-249 Index\",\"date\":\"1957-01-01\"},{\"title\":\"Mining Journal 1836-02-13: Vol 2 Iss 25\",\"date\":\"1836-02-13\"},{\"title\":\"Mining Journal 1836-08-27: Vol 3 Iss 53\",\"date\":\"1836-08-27\"},{\"title\":\"Mining Journal 1836-11: Vol 3 Supplement\",\"date\":\"1836-11-01\"},{\"title\":\"Mining Journal 1840-08-29: Vol 10 Iss 262\",\"date\":\"1840-08-29\"},{\"title\":\"Mining Journal 1842-09-24: Vol 12 Iss 370\",\"date\":\"1842-09-24\"},{\"title\":\"Mining Journal 1843-12-30: Vol 13 Iss 436\",\"date\":\"1843-12-30\"},{\"title\":\"The Mining Journal 1855-01-27: Vol 25 Iss 1014\",\"date\":\"1855-01-27\"},{\"title\":\"The Mining Journal 1857-03-28: Vol 27 Iss 1127\",\"date\":\"1857-03-28\"},{\"title\":\"The Mining Journal 1857-07-18: Vol 27 Supplement\",\"date\":\"1857-07-18\"},{\"title\":\"The Mining Journal 1863-01-10: Vol 33 Iss 1429\",\"date\":\"1863-01-10\"},{\"title\":\"The Mining Journal 1864-01-09: Vol 34 Iss 1481\",\"date\":\"1864-01-09\"},{\"title\":\"The Mining Journal 1864-03-19: Vol 34 Supplement\",\"date\":\"1864-03-19\"},{\"title\":\"The Mining Journal 1865-06-03: Vol 35 Iss 1554\",\"date\":\"1865-06-03\"},{\"title\":\"The Mining Journal 1865-12-09: Vol 35 Iss 1581\",\"date\":\"1865-12-09\"},{\"title\":\"The Mining Journal 1867-02-02: Vol 37 Iss 1641\",\"date\":\"1867-02-02\"},{\"title\":\"The Mining Journal 1867-05-04: Vol 37 Iss 1654\",\"date\":\"1867-05-04\"},{\"title\":\"The Mining Journal 1867-11-23: Vol 37 Supplement\",\"date\":\"1867-11-23\"},{\"title\":\"The Mining Journal 1868-02-29: Vol 38 Iss 1697\",\"date\":\"1868-02-29\"},{\"title\":\"The Mining Journal 1869-06-26: Vol 39 Iss 1766\",\"date\":\"1869-06-26\"},{\"title\":\"The Mining Journal 1873-05-24: Vol 43 Iss 1970\",\"date\":\"1873-05-24\"},{\"title\":\"The Mining Journal 1873-08-30: Vol 43 Iss 1984\",\"date\":\"1873-08-30\"},{\"title\":\"The Mining Journal 1874-02-21: Vol 44 Iss 2009\",\"date\":\"1874-02-21\"},{\"title\":\"The Mining Journal 1874-05-02: Vol 44 Iss 2019\",\"date\":\"1874-05-02\"},{\"title\":\"The Mining Journal 1878-01-19: Vol 48 Supplement\",\"date\":\"1878-01-19\"},{\"title\":\"The Mining Journal 1878-02-16: Vol 48 Supplement\",\"date\":\"1878-02-16\"},{\"title\":\"The Mining Journal 1880-01-03: Vol 50 Iss 2315\",\"date\":\"1880-01-03\"},{\"title\":\"The Mining Journal 1882-05-27: Vol 52 Iss 2440\",\"date\":\"1882-05-27\"},{\"title\":\"The Mining Journal 1896-02-29: Vol 66 Iss 3158\",\"date\":\"1896-02-29\"},{\"title\":\"The Mining Journal 1896: Vol 66 Index\",\"date\":\"1896-01-01\"},{\"title\":\"The Mining Journal 1951-01-05: Vol 236 Iss 6020\",\"date\":\"1951-01-05\"},{\"title\":\"The Mining Journal 1952-11-28: Vol 239 Iss 6119\",\"date\":\"1952-11-28\"},{\"title\":\"The Mining Journal 1953-07-24: Vol 241 Iss 6153\",\"date\":\"1953-07-24\"},{\"title\":\"The Mining Journal 1956-03-16: Vol 246 Iss 6291\",\"date\":\"1956-03-16\"},{\"title\":\"The Mining Journal 1957-07-19: Vol 249 Iss 6361\",\"date\":\"1957-07-19\"},{\"title\":\"The Mining Journal 1957-11-29: Vol 249 Iss 6380\",\"date\":\"1957-11-29\"},{\"title\":\"The Mining Journal 1957-12-20: Vol 249 Iss 6383\",\"date\":\"1957-12-20\"},{\"title\":\"The Mining Journal 1958-01-17: Vol 250 Iss 6387\",\"date\":\"1958-01-17\"},{\"title\":\"The Mining Journal 1958-01-31: Vol 250 Iss 6389\",\"date\":\"1958-01-31\"},{\"title\":\"The Mining Journal 1959-05-15: Vol 252 Iss 6456\",\"date\":\"1959-05-15\"},{\"title\":\"The Mining Journal 1959-07-03: Vol 253 Iss 6463\",\"date\":\"1959-07-03\"},{\"title\":\"The Mining Journal 1959-12-18: Vol 253 Iss 6487\",\"date\":\"1959-12-18\"},{\"title\":\"Mining Journal 1836-02-27: Vol 2 Iss 27\",\"date\":\"1836-02-27\"},{\"title\":\"Mining Journal 1838-03-17: Vol 6 Iss 134\",\"date\":\"1838-03-17\"},{\"title\":\"Mining Journal 1838-04-07: Vol 6 Iss 137\",\"date\":\"1838-04-07\"},{\"title\":\"Mining Journal 1838-07-07: Vol 7 Iss 150\",\"date\":\"1838-07-07\"},{\"title\":\"Mining Journal 1838-10-27: Vol 7 Iss 166\",\"date\":\"1838-10-27\"},{\"title\":\"Mining Journal 1838-12-15: Vol 7 Iss 173\",\"date\":\"1838-12-15\"},{\"title\":\"Mining Journal 1842-04-02: Vol 12 Iss 345\",\"date\":\"1842-04-02\"},{\"title\":\"Mining Journal 1848-11-18: Vol 18 Iss 691\",\"date\":\"1848-11-18\"},{\"title\":\"Mining Journal 1840-04-25: Vol 10 Iss 244\",\"date\":\"1840-04-25\"},{\"title\":\"Mining Journal 1841-04-10: Vol 11 Iss 294\",\"date\":\"1841-04-10\"},{\"title\":\"Mining Journal 1841-05-15: Vol 11 Iss 299\",\"date\":\"1841-05-15\"},{\"title\":\"The Mining Journal 1855-06-09: Vol 25 Iss 1033\",\"date\":\"1855-06-09\"},{\"title\":\"The Mining Journal 1855-08-04: Vol 25 Iss 1041\",\"date\":\"1855-08-04\"},{\"title\":\"The Mining Journal 1856-01-12: Vol 26 Iss 1064\",\"date\":\"1856-01-12\"},{\"title\":\"The Mining Journal 1858-04-24: Vol 28 Iss 1183\",\"date\":\"1858-04-24\"},{\"title\":\"The Mining Journal 1858-05-22: Vol 28 Iss 1187\",\"date\":\"1858-05-22\"},{\"title\":\"The Mining Journal 1858-06-05: Vol 28 Iss 1189\",\"date\":\"1858-06-05\"},{\"title\":\"The Mining Journal 1858-06-12: Vol 28 Iss 1190\",\"date\":\"1858-06-12\"},{\"title\":\"The Mining Journal 1858-06-26: Vol 28 Iss 1192\",\"date\":\"1858-06-26\"},{\"title\":\"The Mining Journal 1863-03-14: Vol 33 Supplement\",\"date\":\"1863-03-14\"},{\"title\":\"The Mining Journal 1863-04-11: Vol 33 Supplement\",\"date\":\"1863-04-11\"},{\"title\":\"The Mining Journal 1863-10-10: Vol 33 Iss 1468\",\"date\":\"1863-10-10\"},{\"title\":\"The Mining Journal 1864-12-10: Vol 34 Supplement\",\"date\":\"1864-12-10\"},{\"title\":\"The Mining Journal 1865-07-29: Vol 35 Iss 1562\",\"date\":\"1865-07-29\"},{\"title\":\"The Mining Journal 1870-01-29: Vol 40 Iss 1797\",\"date\":\"1870-01-29\"},{\"title\":\"The Mining Journal 1870-05-21: Vol 40 Iss 1813\",\"date\":\"1870-05-21\"},{\"title\":\"The Mining Journal 1870-05-28: Vol 40 Iss 1814\",\"date\":\"1870-05-28\"},{\"title\":\"The Mining Journal 1870-06-04: Vol 40 Supplement\",\"date\":\"1870-06-04\"},{\"title\":\"The Mining Journal 1870-08-20: Vol 40 Iss 1826\",\"date\":\"1870-08-20\"},{\"title\":\"The Mining Journal 1868-09-05: Vol 38 Iss 1724\",\"date\":\"1868-09-05\"},{\"title\":\"The Mining Journal 1868-10-10: Vol 38 Iss 1729\",\"date\":\"1868-10-10\"},{\"title\":\"The Mining Journal 1869-02-27: Vol 39 Iss 1749\",\"date\":\"1869-02-27\"},{\"title\":\"The Mining Journal 1869-05-08: Vol 39 Iss 1759\",\"date\":\"1869-05-08\"},{\"title\":\"The Mining Journal 1866-11-24: Vol 36 Iss 1631\",\"date\":\"1866-11-24\"},{\"title\":\"The Mining Journal 1867-03-09: Vol 37 Iss 1646\",\"date\":\"1867-03-09\"},{\"title\":\"The Mining Journal 1867-05-11: Vol 37 Iss 1655\",\"date\":\"1867-05-11\"},{\"title\":\"The Mining Journal 1871-11-11: Vol 41 Iss 1890\",\"date\":\"1871-11-11\"},{\"title\":\"The Mining Journal 1871-12-23: Vol 41 Supplement\",\"date\":\"1871-12-23\"},{\"title\":\"The Mining Journal 1871-07-01: Vol 41 Iss 1871\",\"date\":\"1871-07-01\"},{\"title\":\"The Mining Journal 1871-07-01: Vol 41 Supplement\",\"date\":\"1871-07-01\"},{\"title\":\"The Mining Journal 1871-09-30: Vol 41 Iss 1884\",\"date\":\"1871-09-30\"},{\"title\":\"The Mining Journal 1872-08-31: Vol 42 Iss 1932\",\"date\":\"1872-08-31\"},{\"title\":\"The Mining Journal 1873-09-27: Vol 43 Iss 1988\",\"date\":\"1873-09-27\"},{\"title\":\"The Mining Journal 1873-10-11: Vol 43 Iss 1990\",\"date\":\"1873-10-11\"},{\"title\":\"The Mining Journal 1875-08-14: Vol 45 Supplement\",\"date\":\"1875-08-14\"},{\"title\":\"The Mining Journal 1875-10-02: Vol 45 Iss 2093\",\"date\":\"1875-10-02\"},{\"title\":\"The Mining Journal 1874-03-14: Vol 44 Iss 2012\",\"date\":\"1874-03-14\"},{\"title\":\"The Mining Journal 1874-05-09: Vol 44 Iss 2020\",\"date\":\"1874-05-09\"},{\"title\":\"The Mining Journal 1874-07-18: Vol 44 Iss 2030\",\"date\":\"1874-07-18\"},{\"title\":\"The Mining Journal 1876-02-05: Vol 46 Supplement\",\"date\":\"1876-02-05\"},{\"title\":\"The Mining Journal 1876-03-25: Vol 46 Supplement\",\"date\":\"1876-03-25\"},{\"title\":\"The Mining Journal 1878-07-20: Vol 48 Iss 2239\",\"date\":\"1878-07-20\"},{\"title\":\"The Mining Journal 1878-10-12: Vol 48 Supplement\",\"date\":\"1878-10-12\"},{\"title\":\"The Mining Journal 1878-11-23: Vol 48 Iss 2257\",\"date\":\"1878-11-23\"},{\"title\":\"The Mining Journal 1878: Vol 48 Index\",\"date\":\"1878-01-01\"},{\"title\":\"The Mining Journal 1878-02-16: Vol 48 Iss 2217\",\"date\":\"1878-02-16\"},{\"title\":\"The Mining Journal 1881-01-08: Vol 51 Supplement\",\"date\":\"1881-01-08\"},{\"title\":\"The Mining Journal 1881-01-15: Vol 51 Iss 2369\",\"date\":\"1881-01-15\"},{\"title\":\"The Mining Journal 1881-06-25: Vol 51 Supplement\",\"date\":\"1881-06-25\"},{\"title\":\"The Mining Journal 1882-04-29: Vol 52 Iss 2436\",\"date\":\"1882-04-29\"},{\"title\":\"The Mining Journal 1882-07-22: Vol 52 Iss 2448\",\"date\":\"1882-07-22\"},{\"title\":\"The Mining Journal 1880-08-21: Vol 50 Supplement\",\"date\":\"1880-08-21\"},{\"title\":\"The Mining Journal 1880-12-04: Vol 50 Supplement\",\"date\":\"1880-12-04\"},{\"title\":\"The Mining Journal 1884-02-16: Vol 54 Iss 2530\",\"date\":\"1884-02-16\"},{\"title\":\"The Mining Journal 1883-03-03: Vol 53 Supplement\",\"date\":\"1883-03-03\"},{\"title\":\"The Mining Journal 1883-04-07: Vol 53 Iss 2485\",\"date\":\"1883-04-07\"},{\"title\":\"The Mining Journal 1883-06-30: Vol 53 Iss 2497\",\"date\":\"1883-06-30\"},{\"title\":\"The Mining Journal 1883-09-22: Vol 53 Supplement\",\"date\":\"1883-09-22\"},{\"title\":\"The Mining Journal 1896-02-08: Vol 66 Iss 3155\",\"date\":\"1896-02-08\"},{\"title\":\"The Mining Journal 1951-11-30: Vol 237 Iss 6067\",\"date\":\"1951-11-30\"},{\"title\":\"The Mining Journal 1951-12-21: Vol 237 Iss 6070\",\"date\":\"1951-12-21\"},{\"title\":\"The Mining Journal 1956-10-12: Vol 247 Iss 6321\",\"date\":\"1956-10-12\"},{\"title\":\"The Mining Journal 1960-03-25: Vol 254 Supplement\",\"date\":\"1960-03-25\"},{\"title\":\"Mining Journal 1839-09-07: Vol 9 Iss 211\",\"date\":\"1839-09-07\"},{\"title\":\"Mining Journal 1839-10-05: Vol 9 Iss 215\",\"date\":\"1839-10-05\"},{\"title\":\"Mining Journal 1843-10-07: Vol 13 Iss 424\",\"date\":\"1843-10-07\"},{\"title\":\"Mining Journal 1843-11-25: Vol 13 Iss 431\",\"date\":\"1843-11-25\"},{\"title\":\"Mining Journal 1843-12-23: Vol 13 Iss 435\",\"date\":\"1843-12-23\"},{\"title\":\"Mining Journal 1844-05-04: Vol 14 Iss 454\",\"date\":\"1844-05-04\"},{\"title\":\"Mining Journal 1843-05-27: Vol 13 Iss 405\",\"date\":\"1843-05-27\"},{\"title\":\"Mining Journal 1844: Vol 14 Supplement\",\"date\":\"1844-01-01\"},{\"title\":\"Mining Journal 1845-03-22: Vol 15 Iss 500\",\"date\":\"1845-03-22\"},{\"title\":\"Mining Journal 1845-06-21: Vol 15 Iss 513\",\"date\":\"1845-06-21\"},{\"title\":\"Mining Journal 1851-11-22: Vol 21 Iss 848\",\"date\":\"1851-11-22\"},{\"title\":\"The Mining Journal 1854-07-29: Vol 24 Supplement\",\"date\":\"1854-07-29\"},{\"title\":\"The Mining Journal 1854-09-16: Vol 24 Iss 995\",\"date\":\"1854-09-16\"},{\"title\":\"The Mining Journal 1853-10-29: Vol 23 Iss 949\",\"date\":\"1853-10-29\"},{\"title\":\"The Mining Journal 1854-02-04: Vol 24 Iss 963\",\"date\":\"1854-02-04\"},{\"title\":\"The Mining Journal 1854-04-22: Vol 24 Iss 974\",\"date\":\"1854-04-22\"},{\"title\":\"Mining Journal 1852-10-16: Vol 22 Iss 895\",\"date\":\"1852-10-16\"},{\"title\":\"The Mining Journal 1857-02-28: Vol 27 Supplement\",\"date\":\"1857-02-28\"},{\"title\":\"The Mining Journal 1861-09-28: Vol 31 Iss 1362\",\"date\":\"1861-09-28\"},{\"title\":\"The Mining Journal 1862-01-18: Vol 32 Iss 1378\",\"date\":\"1862-01-18\"},{\"title\":\"The Mining Journal 1862-03-22: Vol 32 Iss 1387\",\"date\":\"1862-03-22\"},{\"title\":\"The Mining Journal 1861-01-19: Vol 31 Iss 1326\",\"date\":\"1861-01-19\"},{\"title\":\"The Mining Journal 1859-01-01: Vol 29 Iss 1219\",\"date\":\"1859-01-01\"},{\"title\":\"The Mining Journal 1866-02-24: Vol 36 Iss 1592\",\"date\":\"1866-02-24\"},{\"title\":\"The Mining Journal 1866-08-18: Vol 36 Iss 1617\",\"date\":\"1866-08-18\"},{\"title\":\"The Mining Journal 1867-11-02: Vol 37 Supplement\",\"date\":\"1867-11-02\"},{\"title\":\"The Mining Journal 1868-03-21: Vol 38 Iss 1700\",\"date\":\"1868-03-21\"},{\"title\":\"The Mining Journal 1868-04-11: Vol 38 Iss 1703\",\"date\":\"1868-04-11\"},{\"title\":\"The Mining Journal 1869-07-31: Vol 39 Iss 1771\",\"date\":\"1869-07-31\"},{\"title\":\"The Mining Journal 1869-08-28: Vol 39 Supplement\",\"date\":\"1869-08-28\"},{\"title\":\"The Mining Journal 1869-09-25: Vol 39 Iss 1779\",\"date\":\"1869-09-25\"},{\"title\":\"The Mining Journal 1869-10-16: Vol 39 Supplement\",\"date\":\"1869-10-16\"},{\"title\":\"The Mining Journal 1869-11-27: Vol 39 Supplement\",\"date\":\"1869-11-27\"},{\"title\":\"The Mining Journal 1872-12-21: Vol 42 Iss 1948\",\"date\":\"1872-12-21\"},{\"title\":\"The Mining Journal 1873-06-07: Vol 43 Iss 1972\",\"date\":\"1873-06-07\"},{\"title\":\"The Mining Journal 1874-10-10: Vol 44 Iss 2042\",\"date\":\"1874-10-10\"},{\"title\":\"The Mining Journal 1874-11-07: Vol 44 Iss 2046\",\"date\":\"1874-11-07\"},{\"title\":\"The Mining Journal 1875-02-06: Vol 45 Iss 2059\",\"date\":\"1875-02-06\"},{\"title\":\"The Mining Journal 1875-04-03: Vol 45 Supplement\",\"date\":\"1875-04-03\"},{\"title\":\"The Mining Journal 1875-04-17: Vol 45 Iss 2069\",\"date\":\"1875-04-17\"},{\"title\":\"The Mining Journal 1877-04-21: Vol 47 Iss 2174\",\"date\":\"1877-04-21\"},{\"title\":\"The Mining Journal 1877-07-07: Vol 47 Supplement\",\"date\":\"1877-07-07\"},{\"title\":\"The Mining Journal 1876-10-07: Vol 46 Iss 2146\",\"date\":\"1876-10-07\"},{\"title\":\"The Mining Journal 1876-10-14: Vol 46 Supplement\",\"date\":\"1876-10-14\"},{\"title\":\"The Mining Journal 1879-05-31: Vol 49 Iss 2284\",\"date\":\"1879-05-31\"},{\"title\":\"The Mining Journal 1879-09-13: Vol 49 Iss 2299\",\"date\":\"1879-09-13\"},{\"title\":\"The Mining Journal 1879-10-25: Vol 49 Supplement\",\"date\":\"1879-10-25\"},{\"title\":\"The Mining Journal 1882-01-07: Vol 52 Iss 2420\",\"date\":\"1882-01-07\"},{\"title\":\"The Mining Journal 1895-08-24: Vol 65 Iss 3131\",\"date\":\"1895-08-24\"},{\"title\":\"The Mining Journal 1895-08-31: Vol 65 Iss 3132\",\"date\":\"1895-08-31\"},{\"title\":\"The Mining Journal 1954-10-01: Vol 243 Iss 6215\",\"date\":\"1954-10-01\"},{\"title\":\"The Mining Journal 1960-07-29: Vol 254 Supplement\",\"date\":\"1960-07-29\"},{\"title\":\"Mining Magazine 1969: Vol 120 Index\",\"date\":\"1969-01-01\"},{\"title\":\"Mining Journal January-June 1981: Vol 296-144 Index\",\"date\":\"1981-01-01\"},{\"title\":\"The Mining Journal July-December 1951: Vol 237 Index\",\"date\":\"1951-07-01\"},{\"title\":\"Mining Journal 1837: Vol 3 Supplement\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1850-12-21: Vol 20 Iss 800\",\"date\":\"1850-12-21\"},{\"title\":\"Mining Journal 1840-05-23: Vol 10 Iss 248\",\"date\":\"1840-05-23\"},{\"title\":\"The Mining Journal 1853-03-05: Vol 23 Iss 915\",\"date\":\"1853-03-05\"},{\"title\":\"The Mining Journal 1855-11-17: Vol 25 Iss 1056\",\"date\":\"1855-11-17\"},{\"title\":\"The Mining Journal 1863-08-08: Vol 33 Iss 1459\",\"date\":\"1863-08-08\"},{\"title\":\"The Mining Journal 1864-06-04: Vol 34 Supplement\",\"date\":\"1864-06-04\"},{\"title\":\"The Mining Journal 1867-12-07: Vol 37 Iss 1685\",\"date\":\"1867-12-07\"},{\"title\":\"The Mining Journal 1870-02-19: Vol 40 Supplement\",\"date\":\"1870-02-19\"},{\"title\":\"The Mining Journal 1870-03-05: Vol 40 Supplement\",\"date\":\"1870-03-05\"},{\"title\":\"The Mining Journal 1870-07-02: Vol 40 Supplement\",\"date\":\"1870-07-02\"},{\"title\":\"The Mining Journal 1869-01-16: Vol 39 Supplement\",\"date\":\"1869-01-16\"},{\"title\":\"The Mining Journal 1869-02-20: Vol 39 Iss 1748\",\"date\":\"1869-02-20\"},{\"title\":\"The Mining Journal 1870-12-24: Vol 40 Iss 1844\",\"date\":\"1870-12-24\"},{\"title\":\"The Mining Journal 1870-12-24: Vol 40 Supplement\",\"date\":\"1870-12-24\"},{\"title\":\"The Mining Journal 1871-02-18: Vol 41 Supplement\",\"date\":\"1871-02-18\"},{\"title\":\"The Mining Journal 1872-01-06: Vol 42 Iss 1898\",\"date\":\"1872-01-06\"},{\"title\":\"The Mining Journal 1872-02-03: Vol 42 Supplement\",\"date\":\"1872-02-03\"},{\"title\":\"The Mining Journal 1872-05-18: Vol 42 Iss 1917\",\"date\":\"1872-05-18\"},{\"title\":\"The Mining Journal 1872-08-31: Vol 42 Supplement\",\"date\":\"1872-08-31\"},{\"title\":\"The Mining Journal 1872-10-05: Vol 42 Supplement\",\"date\":\"1872-10-05\"},{\"title\":\"The Mining Journal 1873-09-06: Vol 43 Iss 1985\",\"date\":\"1873-09-06\"},{\"title\":\"The Mining Journal 1874-05-30: Vol 44 Supplement\",\"date\":\"1874-05-30\"},{\"title\":\"The Mining Journal 1874-08-01: Vol 44 Iss 2032\",\"date\":\"1874-08-01\"},{\"title\":\"The Mining Journal 1877-01-06: Vol 47 Supplement\",\"date\":\"1877-01-06\"},{\"title\":\"The Mining Journal 1881-05-21: Vol 51 Iss 2387\",\"date\":\"1881-05-21\"},{\"title\":\"The Mining Journal 1879-05-31: Vol 49 Supplement\",\"date\":\"1879-05-31\"},{\"title\":\"The Mining Journal 1879-07-12: Vol 49 Supplement\",\"date\":\"1879-07-12\"},{\"title\":\"The Mining Journal 1881-10-01: Vol 51 Iss 2406\",\"date\":\"1881-10-01\"},{\"title\":\"The Mining Journal 1881-11-19: Vol 51 Iss 2413\",\"date\":\"1881-11-19\"},{\"title\":\"The Mining Journal 1881-12-10: Vol 51 Iss 2416\",\"date\":\"1881-12-10\"},{\"title\":\"The Mining Journal 1884-08-09: Vol 54 Supplement\",\"date\":\"1884-08-09\"},{\"title\":\"The Mining Journal 1884-10-18: Vol 54 Supplement\",\"date\":\"1884-10-18\"},{\"title\":\"The Mining Journal 1883-06-23: Vol 53 Supplement\",\"date\":\"1883-06-23\"},{\"title\":\"The Mining Journal 1895-08-17: Vol 65 Iss 3130\",\"date\":\"1895-08-17\"},{\"title\":\"The Mining Journal 1895-09-14: Vol 65 Iss 3134\",\"date\":\"1895-09-14\"},{\"title\":\"The Mining Journal 1895-11-02: Vol 65 Iss 3141\",\"date\":\"1895-11-02\"},{\"title\":\"The Mining Journal 1896-01-04: Vol 66 Iss 3150\",\"date\":\"1896-01-04\"},{\"title\":\"The Mining Journal 1896-01-25: Vol 66 Iss 3153\",\"date\":\"1896-01-25\"},{\"title\":\"The Mining Journal 1954-05-28: Vol 242 Iss 6197\",\"date\":\"1954-05-28\"},{\"title\":\"The Mining Journal 1957-11-01: Vol 249 Iss 6376\",\"date\":\"1957-11-01\"},{\"title\":\"The Mining Journal 1958-02-28: Vol 250 Iss 6393\",\"date\":\"1958-02-28\"},{\"title\":\"The Mining Magazine 1958-08: Vol 98 Iss 8\",\"date\":\"1958-08-01\"},{\"title\":\"The Mining Journal 1961-01-27: Vol 256 Supplement\",\"date\":\"1961-01-27\"},{\"title\":\"The Mining Journal 1961-01-27: Vol 256 Supplement\",\"date\":\"1961-01-27\"},{\"title\":\"The Mining Journal 1959-11-27: Vol 253 Iss 6484\",\"date\":\"1959-11-27\"},{\"title\":\"The Mining Journal 1960-02-26: Vol 254 Iss 6497\",\"date\":\"1960-02-26\"},{\"title\":\"The Mining Journal 1961-11-24: Vol 257 Iss 6588\",\"date\":\"1961-11-24\"},{\"title\":\"Mining Journal 1838-02-03: Vol 6 Iss 128\",\"date\":\"1838-02-03\"},{\"title\":\"Mining Journal 1838-03-03: Vol 6 Iss 132\",\"date\":\"1838-03-03\"},{\"title\":\"Mining Journal 1838-12-01: Vol 7 Iss 171\",\"date\":\"1838-12-01\"},{\"title\":\"Mining Journal 1841-12-04: Vol 11 Iss 328\",\"date\":\"1841-12-04\"},{\"title\":\"Mining Journal 1841-12-18: Vol 11 Iss 330\",\"date\":\"1841-12-18\"},{\"title\":\"Mining Journal 1844-03-09: Vol 14 Iss 446\",\"date\":\"1844-03-09\"},{\"title\":\"Mining Journal 1844-03-16: Vol 14 Iss 447\",\"date\":\"1844-03-16\"},{\"title\":\"Mining Journal 1844: Vol 14 Supplement\",\"date\":\"1844-01-01\"},{\"title\":\"Mining Journal 1844: Vol 14 Supplement\",\"date\":\"1844-01-01\"},{\"title\":\"Mining Journal 1845-05-03: Vol 15 Iss 506\",\"date\":\"1845-05-03\"},{\"title\":\"Mining Journal 1846-12-12: Vol 16 Iss 590\",\"date\":\"1846-12-12\"},{\"title\":\"Mining Journal 1846-08-01: Vol 16 Iss 571\",\"date\":\"1846-08-01\"},{\"title\":\"Mining Journal 1851-11-29: Vol 21 Iss 849\",\"date\":\"1851-11-29\"},{\"title\":\"Mining Journal 1848-12-30: Vol 18 Iss 697\",\"date\":\"1848-12-30\"},{\"title\":\"Mining Journal 1849-05-12: Vol 19 Iss 716\",\"date\":\"1849-05-12\"},{\"title\":\"The Mining Journal 1854-07-08: Vol 24 Iss 985\",\"date\":\"1854-07-08\"},{\"title\":\"The Mining Journal 1855-02-03: Vol 25 Iss 1015\",\"date\":\"1855-02-03\"},{\"title\":\"The Mining Journal 1856-08-02: Vol 26 Supplement\",\"date\":\"1856-08-02\"},{\"title\":\"The Mining Journal 1861-11-23: Vol 31 Iss 1370\",\"date\":\"1861-11-23\"},{\"title\":\"The Mining Journal 1857: Vol 27 Index\",\"date\":\"1857-01-01\"},{\"title\":\"The Mining Journal 1858-04-03: Vol 28 Iss 1180\",\"date\":\"1858-04-03\"},{\"title\":\"The Mining Journal 1858-05-08: Vol 28 Supplement\",\"date\":\"1858-05-08\"},{\"title\":\"The Mining Journal 1862-08-23: Vol 32 Supplement\",\"date\":\"1862-08-23\"},{\"title\":\"The Mining Journal 1862-11-15: Vol 32 Iss 1421\",\"date\":\"1862-11-15\"},{\"title\":\"The Mining Journal 1863-01-03: Vol 33 Iss 1428\",\"date\":\"1863-01-03\"},{\"title\":\"The Mining Journal 1859-08-13: Vol 29 Supplement\",\"date\":\"1859-08-13\"},{\"title\":\"The Mining Journal 1859-08-20: Vol 29 Iss 1252\",\"date\":\"1859-08-20\"},{\"title\":\"The Mining Journal 1865-05-13: Vol 35 Supplement\",\"date\":\"1865-05-13\"},{\"title\":\"The Mining Journal 1865-05-27: Vol 35 Iss 1553\",\"date\":\"1865-05-27\"},{\"title\":\"The Mining Journal 1870-01-15: Vol 40 Iss 1795\",\"date\":\"1870-01-15\"},{\"title\":\"The Mining Journal 1866-12-22: Vol 36 Iss 1635\",\"date\":\"1866-12-22\"},{\"title\":\"The Mining Journal 1867-07-20: Vol 37 Iss 1665\",\"date\":\"1867-07-20\"},{\"title\":\"The Mining Journal 1871-05-20: Vol 41 Supplement\",\"date\":\"1871-05-20\"},{\"title\":\"The Mining Journal 1871-07-08: Vol 41 Supplement\",\"date\":\"1871-07-08\"},{\"title\":\"The Mining Journal 1871-08-19: Vol 41 Supplement\",\"date\":\"1871-08-19\"},{\"title\":\"The Mining Journal 1873-04-12: Vol 43 Iss 1964\",\"date\":\"1873-04-12\"},{\"title\":\"The Mining Journal 1876-02-26: Vol 46 Iss 2114\",\"date\":\"1876-02-26\"},{\"title\":\"The Mining Journal 1876-08-05: Vol 46 Supplement\",\"date\":\"1876-08-05\"},{\"title\":\"The Mining Journal 1877-08-04: Vol 47 Supplement\",\"date\":\"1877-08-04\"},{\"title\":\"The Mining Journal 1878-03-30: Vol 48 Iss 2223\",\"date\":\"1878-03-30\"},{\"title\":\"The Mining Journal 1878-06-22: Vol 48 Supplement\",\"date\":\"1878-06-22\"},{\"title\":\"The Mining Journal 1879-12-06: Vol 49 Iss 2311\",\"date\":\"1879-12-06\"},{\"title\":\"The Mining Journal 1879-12-27: Vol 49 Iss 2314\",\"date\":\"1879-12-27\"},{\"title\":\"The Mining Journal 1882-06-24: Vol 52 Supplement\",\"date\":\"1882-06-24\"},{\"title\":\"The Mining Journal 1882-12-09: Vol 52 Iss 2468\",\"date\":\"1882-12-09\"},{\"title\":\"The Mining Journal 1880-07-17: Vol 50 Iss 2343\",\"date\":\"1880-07-17\"},{\"title\":\"The Mining Journal 1880-09-11: Vol 50 Supplement\",\"date\":\"1880-09-11\"},{\"title\":\"The Mining Journal 1883-11-03: Vol 53 Supplement\",\"date\":\"1883-11-03\"},{\"title\":\"The Mining Journal 1883-11-10: Vol 53 Supplement\",\"date\":\"1883-11-10\"},{\"title\":\"The Mining Journal 1884-01-05: Vol 54 Iss 2524\",\"date\":\"1884-01-05\"},{\"title\":\"The Mining Journal 1884-02-23: Vol 54 Iss 2531\",\"date\":\"1884-02-23\"},{\"title\":\"The Mining Journal 1884-04-26: Vol 54 Supplement\",\"date\":\"1884-04-26\"},{\"title\":\"The Mining Journal 1885-08-22: Vol 55 Iss 2609\",\"date\":\"1885-08-22\"},{\"title\":\"The Mining Journal 1957-01-11: Vol 248 Iss 6334\",\"date\":\"1957-01-11\"},{\"title\":\"The Mining Journal 1959-02-20: Vol 252 Iss 6444\",\"date\":\"1959-02-20\"},{\"title\":\"The Mining Journal 1959-04-24: Vol 252 Iss 6453\",\"date\":\"1959-04-24\"},{\"title\":\"The Mining Journal 1959-07-10: Vol 253 Supplement\",\"date\":\"1959-07-10\"},{\"title\":\"The Mining Journal 1959-08-28: Vol 253 Iss 6471\",\"date\":\"1959-08-28\"},{\"title\":\"The Mining Journal 1959-10-02: Vol 253 Iss 6476\",\"date\":\"1959-10-02\"},{\"title\":\"The Mining Journal Magazine January-June 1962: Vol 106 Index\",\"date\":\"1962-01-01\"},{\"title\":\"Mining Journal 1837-01-14: Vol 4 Iss 73\",\"date\":\"1837-01-14\"},{\"title\":\"Mining Journal 1837-09-16: Vol 5 Iss 108\",\"date\":\"1837-09-16\"},{\"title\":\"Mining Journal 1837-12-23: Vol 5 Iss 122\",\"date\":\"1837-12-23\"},{\"title\":\"Mining Journal 1837: Vol 3 Supplement\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1838-04-14: Vol 6 Iss 138\",\"date\":\"1838-04-14\"},{\"title\":\"Mining Journal 1838-04-21: Vol 6 Iss 139\",\"date\":\"1838-04-21\"},{\"title\":\"Mining Journal 1848-07-29: Vol 18 Iss 675\",\"date\":\"1848-07-29\"},{\"title\":\"The Mining Journal 1853-04-16: Vol 23 Iss 921\",\"date\":\"1853-04-16\"},{\"title\":\"The Mining Journal 1854-04-29: Vol 24 Iss 975\",\"date\":\"1854-04-29\"},{\"title\":\"The Mining Journal 1855-05-26: Vol 25 Iss 1031\",\"date\":\"1855-05-26\"},{\"title\":\"The Mining Journal 1857-06-13: Vol 27 Supplement\",\"date\":\"1857-06-13\"},{\"title\":\"The Mining Journal 1857-09-26: Vol 27 Iss 1153\",\"date\":\"1857-09-26\"},{\"title\":\"The Mining Journal 1857-10-03: Vol 27 Iss 1154\",\"date\":\"1857-10-03\"},{\"title\":\"The Mining Journal 1858-12-04: Vol 28 Iss 1215\",\"date\":\"1858-12-04\"},{\"title\":\"The Mining Journal 1859-02-19: Vol 29 Iss 1226\",\"date\":\"1859-02-19\"},{\"title\":\"The Mining Journal 1863-05-30: Vol 33 Iss 1449\",\"date\":\"1863-05-30\"},{\"title\":\"The Mining Journal 1865-06-10: Vol 35 Iss 1555\",\"date\":\"1865-06-10\"},{\"title\":\"The Mining Journal 1870-04-16: Vol 40 Supplement\",\"date\":\"1870-04-16\"},{\"title\":\"The Mining Journal 1871-08-26: Vol 41 Iss 1879\",\"date\":\"1871-08-26\"},{\"title\":\"The Mining Journal 1871-12-02: Vol 41 Supplement\",\"date\":\"1871-12-02\"},{\"title\":\"The Mining Journal 1872-07-20: Vol 42 Iss 1926\",\"date\":\"1872-07-20\"},{\"title\":\"The Mining Journal 1872-08-17: Vol 42 Iss 1930\",\"date\":\"1872-08-17\"},{\"title\":\"The Mining Journal 1873-05-31: Vol 43 Supplement\",\"date\":\"1873-05-31\"},{\"title\":\"The Mining Journal 1874-07-25: Vol 44 Iss 2031\",\"date\":\"1874-07-25\"},{\"title\":\"The Mining Journal 1874-08-08: Vol 44 Supplement\",\"date\":\"1874-08-08\"},{\"title\":\"The Mining Journal 1876-11-18: Vol 46 Iss 2152\",\"date\":\"1876-11-18\"},{\"title\":\"The Mining Journal 1880-05-29: Vol 50 Iss 2336\",\"date\":\"1880-05-29\"},{\"title\":\"The Mining Journal 1880-11-06: Vol 50 Supplement\",\"date\":\"1880-11-06\"},{\"title\":\"The Mining Journal 1881-03-12: Vol 51 Supplement\",\"date\":\"1881-03-12\"},{\"title\":\"The Mining Journal 1882-11-04: Vol 52 Iss 2463\",\"date\":\"1882-11-04\"},{\"title\":\"The Mining Journal 1883-01-27: Vol 53 Supplement\",\"date\":\"1883-01-27\"},{\"title\":\"The Mining Journal 1883-03-10: Vol 53 Supplement\",\"date\":\"1883-03-10\"},{\"title\":\"The Mining Journal 1883-07-07: Vol 53 Supplement\",\"date\":\"1883-07-07\"},{\"title\":\"The Mining Journal 1883-09-15: Vol 53 Supplement\",\"date\":\"1883-09-15\"},{\"title\":\"The Mining Journal 1884: Vol 54 Index\",\"date\":\"1884-01-01\"},{\"title\":\"The Mining Journal 1885-06-06: Vol 55 Iss 2598\",\"date\":\"1885-06-06\"},{\"title\":\"The Mining Journal 1885-12-05: Vol 55 Iss 2624\",\"date\":\"1885-12-05\"},{\"title\":\"The Mining Journal 1952-01-25: Vol 238 Iss 6075\",\"date\":\"1952-01-25\"},{\"title\":\"The Mining Journal 1956-06-01: Vol 246 Iss 6302\",\"date\":\"1956-06-01\"},{\"title\":\"The Mining Journal 1957-01-25: Vol 248 Iss 6336\",\"date\":\"1957-01-25\"},{\"title\":\"The Mining Journal 1959-03-06: Vol 252 Iss 6446\",\"date\":\"1959-03-06\"},{\"title\":\"The Mining Magazine 1960-06: Vol 102 Iss 6\",\"date\":\"1960-06-01\"},{\"title\":\"The Mining Journal 1960-09-09: Vol 254 Iss 6525\",\"date\":\"1960-09-09\"},{\"title\":\"The Mining Journal 1960-09-16: Vol 254 Iss 6526\",\"date\":\"1960-09-16\"},{\"title\":\"The Mining Journal 1961-01-06: Vol 256 Iss 6542\",\"date\":\"1961-01-06\"},{\"title\":\"The Mining Journal 1961-08-04: Vol 257 Iss 6572\",\"date\":\"1961-08-04\"},{\"title\":\"The Mining Journal 1961-09-29: Vol 257 Iss 6580\",\"date\":\"1961-09-29\"},{\"title\":\"Mining Journal 1836-01-30: Vol 2 Iss 23\",\"date\":\"1836-01-30\"},{\"title\":\"Mining Journal 1836-04-16: Vol 2 Iss 34\",\"date\":\"1836-04-16\"},{\"title\":\"Mining Journal 1836-10-15: Vol 3 Iss 60\",\"date\":\"1836-10-15\"},{\"title\":\"Mining Journal 1838-09-29: Vol 7 Iss 162\",\"date\":\"1838-09-29\"},{\"title\":\"Mining Journal 1838-10-06: Vol 7 Iss 163\",\"date\":\"1838-10-06\"},{\"title\":\"Mining Journal 1839-03-16: Vol 8 Iss 186\",\"date\":\"1839-03-16\"},{\"title\":\"Mining Journal 1839-10-12: Vol 9 Iss 216\",\"date\":\"1839-10-12\"},{\"title\":\"Mining Journal 1839-10-19: Vol 9 Iss 217\",\"date\":\"1839-10-19\"},{\"title\":\"Mining Journal 1840-03-28: Vol 10 Iss 240\",\"date\":\"1840-03-28\"},{\"title\":\"Mining Journal 1840-11-14: Vol 10 Iss 273\",\"date\":\"1840-11-14\"},{\"title\":\"Mining Journal 1841-02-06: Vol 11 Iss 285\",\"date\":\"1841-02-06\"},{\"title\":\"Mining Journal 1841-07-10: Vol 11 Iss 307\",\"date\":\"1841-07-10\"},{\"title\":\"Mining Journal 1841-10-16: Vol 11 Iss 321\",\"date\":\"1841-10-16\"},{\"title\":\"Mining Journal 1842-09-10: Vol 12 Iss 368\",\"date\":\"1842-09-10\"},{\"title\":\"Mining Journal 1842-10-08: Vol 12 Iss 372\",\"date\":\"1842-10-08\"},{\"title\":\"Mining Journal 1842-12-31: Vol 12 Iss 384\",\"date\":\"1842-12-31\"},{\"title\":\"Mining Journal 1843-04-01: Vol 13 Iss 397\",\"date\":\"1843-04-01\"},{\"title\":\"Mining Journal 1844-07-27: Vol 14 Iss 466\",\"date\":\"1844-07-27\"},{\"title\":\"Mining Journal 1844-08-17: Vol 14 Iss 469\",\"date\":\"1844-08-17\"},{\"title\":\"Mining Journal 1845-10-04: Vol 15 Iss 528\",\"date\":\"1845-10-04\"},{\"title\":\"Mining Journal 1849-06-30: Vol 19 Iss 723\",\"date\":\"1849-06-30\"},{\"title\":\"Mining Journal 1849-10-06: Vol 19 Iss 737\",\"date\":\"1849-10-06\"},{\"title\":\"Mining Journal 1849-11-24: Vol 19 Iss 744\",\"date\":\"1849-11-24\"},{\"title\":\"Mining Journal 1850-06-01: Vol 20 Iss 771\",\"date\":\"1850-06-01\"},{\"title\":\"Mining Journal 1852-12-18: Vol 22 Iss 904\",\"date\":\"1852-12-18\"},{\"title\":\"The Mining Journal 1855-08-11: Vol 25 Iss 1042\",\"date\":\"1855-08-11\"},{\"title\":\"The Mining Journal 1855-10-20: Vol 25 Iss 1052\",\"date\":\"1855-10-20\"},{\"title\":\"The Mining Journal 1856-11-01: Vol 26 Iss 1106\",\"date\":\"1856-11-01\"},{\"title\":\"The Mining Journal 1857-04-04: Vol 27 Supplement\",\"date\":\"1857-04-04\"},{\"title\":\"The Mining Journal 1861-01-12: Vol 31 Iss 1325\",\"date\":\"1861-01-12\"},{\"title\":\"The Mining Journal 1861-01-26: Vol 31 Iss 1327\",\"date\":\"1861-01-26\"},{\"title\":\"The Mining Journal 1861-09-07: Vol 31 Iss 1359\",\"date\":\"1861-09-07\"},{\"title\":\"The Mining Journal 1862-03-01: Vol 32 Iss 1384\",\"date\":\"1862-03-01\"},{\"title\":\"The Mining Journal 1867-11-09: Vol 37 Iss 1681\",\"date\":\"1867-11-09\"},{\"title\":\"The Mining Journal 1868-01-04: Vol 38 Iss 1689\",\"date\":\"1868-01-04\"},{\"title\":\"The Mining Journal 1868-07-25: Vol 38 Supplement\",\"date\":\"1868-07-25\"},{\"title\":\"The Mining Journal 1869-01-02: Vol 39 Supplement\",\"date\":\"1869-01-02\"},{\"title\":\"The Mining Journal 1869-03-13: Vol 39 Iss 1751\",\"date\":\"1869-03-13\"},{\"title\":\"The Mining Journal 1869-10-02: Vol 39 Supplement\",\"date\":\"1869-10-02\"},{\"title\":\"The Mining Journal 1870-04-02: Vol 40 Iss 1806\",\"date\":\"1870-04-02\"},{\"title\":\"The Mining Journal 1874-12-12: Vol 44 Supplement\",\"date\":\"1874-12-12\"},{\"title\":\"The Mining Journal 1875-06-05: Vol 45 Supplement\",\"date\":\"1875-06-05\"},{\"title\":\"The Mining Journal 1878-09-07: Vol 48 Supplement\",\"date\":\"1878-09-07\"},{\"title\":\"The Mining Journal 1878-09-14: Vol 48 Supplement\",\"date\":\"1878-09-14\"},{\"title\":\"The Mining Journal 1879-01-11: Vol 49 Supplement\",\"date\":\"1879-01-11\"},{\"title\":\"The Mining Journal 1879-01-25: Vol 49 Iss 2266\",\"date\":\"1879-01-25\"},{\"title\":\"The Mining Journal 1879-08-16: Vol 49 Iss 2295\",\"date\":\"1879-08-16\"},{\"title\":\"The Mining Journal 1880-02-21: Vol 50 Iss 2322\",\"date\":\"1880-02-21\"},{\"title\":\"The Mining Journal 1880-03-06: Vol 50 Iss 2324\",\"date\":\"1880-03-06\"},{\"title\":\"The Mining Journal 1881-06-18: Vol 51 Iss 2391\",\"date\":\"1881-06-18\"},{\"title\":\"The Mining Journal 1883: Vol 53 Index\",\"date\":\"1883-01-01\"},{\"title\":\"The Mining Journal 1883: Vol 53 Index\",\"date\":\"1883-01-01\"},{\"title\":\"The Mining Journal 1884-12-20: Vol 54 Supplement\",\"date\":\"1884-12-20\"},{\"title\":\"The Mining Journal 1894-10-06: Vol 64 Iss 3085\",\"date\":\"1894-10-06\"},{\"title\":\"The Mining Journal 1894-10-13: Vol 64 Iss 3086\",\"date\":\"1894-10-13\"},{\"title\":\"The Mining Journal 1895-07-27: Vol 65 Iss 3127\",\"date\":\"1895-07-27\"},{\"title\":\"The Mining Journal 1895-11-16: Vol 65 Iss 3143\",\"date\":\"1895-11-16\"},{\"title\":\"The Mining Journal 1952-08-08: Vol 239 Iss 6103\",\"date\":\"1952-08-08\"},{\"title\":\"The Mining Journal 1952-08-22: Vol 239 Iss 6105\",\"date\":\"1952-08-22\"},{\"title\":\"The Mining Journal 1953-07-03: Vol 241 Iss 6150\",\"date\":\"1953-07-03\"},{\"title\":\"The Mining Journal 1954-01-01: Vol 242 Iss 6176\",\"date\":\"1954-01-01\"},{\"title\":\"The Mining Journal 1955-01-07: Vol 244 Iss 6229\",\"date\":\"1955-01-07\"},{\"title\":\"The Mining Journal 1955-02-25: Vol 244 Iss 6236\",\"date\":\"1955-02-25\"},{\"title\":\"The Mining Journal 1955-12-16: Vol 245 Iss 6278\",\"date\":\"1955-12-16\"},{\"title\":\"The Mining Journal 1956-03-02: Vol 246 Iss 6289\",\"date\":\"1956-03-02\"},{\"title\":\"The Mining Journal 1958-06-20: Vol 250 Iss 6409\",\"date\":\"1958-06-20\"},{\"title\":\"The Mining Journal 1959-07-31: Vol 253 Iss 6467\",\"date\":\"1959-07-31\"},{\"title\":\"The Mining Journal 1960-02-05: Vol 254 Iss 6494\",\"date\":\"1960-02-05\"},{\"title\":\"The Mining Journal 1960-03-18: Vol 254 Iss 6500\",\"date\":\"1960-03-18\"},{\"title\":\"The Mining Journal Magazine 1961-11: Vol 105 Iss 5\",\"date\":\"1961-11-01\"},{\"title\":\"Mining Journal 1996: Vol 326 Index\",\"date\":\"1996-01-01\"},{\"title\":\"The Mining Magazine January-June 1959: Vol 100 Index\",\"date\":\"1959-01-01\"},{\"title\":\"Mining Journal 1838-10-20: Vol 7 Iss 165\",\"date\":\"1838-10-20\"},{\"title\":\"Mining Journal 1839-11-02: Vol 9 Iss 219\",\"date\":\"1839-11-02\"},{\"title\":\"Mining Journal 1840-01-25: Vol 10 Iss 231\",\"date\":\"1840-01-25\"},{\"title\":\"Mining Journal 1840-02-29: Vol 10 Iss 236\",\"date\":\"1840-02-29\"},{\"title\":\"Mining Journal 1840-06-20: Vol 10 Iss 252\",\"date\":\"1840-06-20\"},{\"title\":\"Mining Journal 1840-07-04: Vol 10 Iss 254\",\"date\":\"1840-07-04\"},{\"title\":\"Mining Journal 1843-01-21: Vol 13 Iss 387\",\"date\":\"1843-01-21\"},{\"title\":\"Mining Journal 1847-04-03: Vol 17 Iss 606\",\"date\":\"1847-04-03\"},{\"title\":\"Mining Journal 1848-01-22: Vol 18 Iss 648\",\"date\":\"1848-01-22\"},{\"title\":\"Mining Journal 1849-03-03: Vol 19 Iss 706\",\"date\":\"1849-03-03\"},{\"title\":\"Mining Journal 1849-07-21: Vol 19 Iss 726\",\"date\":\"1849-07-21\"},{\"title\":\"Mining Journal 1850-04-20: Vol 20 Iss 765\",\"date\":\"1850-04-20\"},{\"title\":\"Mining Journal 1851-05-03: Vol 21 Iss 819\",\"date\":\"1851-05-03\"},{\"title\":\"Mining Journal 1852-07-10: Vol 22 Iss 881\",\"date\":\"1852-07-10\"},{\"title\":\"Mining Journal 1852-08-07: Vol 22 Iss 885\",\"date\":\"1852-08-07\"},{\"title\":\"The Mining Journal 1861-02-02: Vol 31 Iss 1328\",\"date\":\"1861-02-02\"},{\"title\":\"The Mining Journal 1861-04-27: Vol 31 Iss 1340\",\"date\":\"1861-04-27\"},{\"title\":\"The Mining Journal 1861-11-02: Vol 31 Iss 1367\",\"date\":\"1861-11-02\"},{\"title\":\"The Mining Journal 1861-11-23: Vol 31 Supplement\",\"date\":\"1861-11-23\"},{\"title\":\"The Mining Journal 1862-03-08: Vol 32 Iss 1385\",\"date\":\"1862-03-08\"},{\"title\":\"The Mining Journal 1862-06-21: Vol 32 Iss 1400\",\"date\":\"1862-06-21\"},{\"title\":\"The Mining Journal 1862-12-06: Vol 32 Iss 1424\",\"date\":\"1862-12-06\"},{\"title\":\"The Mining Journal 1866-05-12: Vol 36 Iss 1603\",\"date\":\"1866-05-12\"},{\"title\":\"The Mining Journal 1866-10-06: Vol 36 Iss 1624\",\"date\":\"1866-10-06\"},{\"title\":\"The Mining Journal 1866-10-20: Vol 36 Iss 1626\",\"date\":\"1866-10-20\"},{\"title\":\"The Mining Journal 1866-12-08: Vol 36 Supplement\",\"date\":\"1866-12-08\"},{\"title\":\"The Mining Journal 1869-10-23: Vol 39 Supplement\",\"date\":\"1869-10-23\"},{\"title\":\"The Mining Journal 1870-02-26: Vol 40 Iss 1801\",\"date\":\"1870-02-26\"},{\"title\":\"The Mining Journal 1873-05-17: Vol 43 Iss 1969\",\"date\":\"1873-05-17\"},{\"title\":\"The Mining Journal 1874-05-30: Vol 44 Iss 2023\",\"date\":\"1874-05-30\"},{\"title\":\"The Mining Journal 1877-01-13: Vol 47 Supplement\",\"date\":\"1877-01-13\"},{\"title\":\"The Mining Journal 1882-12-23: Vol 52 Supplement\",\"date\":\"1882-12-23\"},{\"title\":\"The Mining Journal 1883-04-28: Vol 53 Iss 2488\",\"date\":\"1883-04-28\"},{\"title\":\"The Mining Journal 1883-06-02: Vol 53 Supplement\",\"date\":\"1883-06-02\"},{\"title\":\"The Mining Journal 1883-11-03: Vol 53 Iss 2515\",\"date\":\"1883-11-03\"},{\"title\":\"The Mining Journal 1884-02-23: Vol 54 Supplement\",\"date\":\"1884-02-23\"},{\"title\":\"The Mining Journal 1884-05-10: Vol 54 Supplement\",\"date\":\"1884-05-10\"},{\"title\":\"The Mining Journal 1884-08-02: Vol 54 Supplement\",\"date\":\"1884-08-02\"},{\"title\":\"The Mining Journal 1953-11-06: Vol 241 Iss 6168\",\"date\":\"1953-11-06\"},{\"title\":\"The Mining Journal 1954-06-04: Vol 242 Iss 6198\",\"date\":\"1954-06-04\"},{\"title\":\"The Mining Journal 1954-10-22: Vol 243 Iss 6218\",\"date\":\"1954-10-22\"},{\"title\":\"The Mining Journal 1954-10-29: Vol 243 Iss 6219\",\"date\":\"1954-10-29\"},{\"title\":\"The Mining Journal 1957-07-05: Vol 249 Iss 6359\",\"date\":\"1957-07-05\"},{\"title\":\"The Mining Journal 1957-09-27: Vol 249 Iss 6371\",\"date\":\"1957-09-27\"},{\"title\":\"The Mining Journal 1957-10-04: Vol 249 Iss 6372\",\"date\":\"1957-10-04\"},{\"title\":\"The Mining Journal 1958-06-27: Vol 250 Iss 6410\",\"date\":\"1958-06-27\"},{\"title\":\"The Mining Journal 1958-07-18: Vol 251 Iss 6413\",\"date\":\"1958-07-18\"},{\"title\":\"The Mining Magazine 1960-10: Vol 103 Iss 4\",\"date\":\"1960-10-01\"},{\"title\":\"The Mining Journal 1961-06-02: Vol 256 Iss 6563\",\"date\":\"1961-06-02\"},{\"title\":\"The Mining Journal 1961-08-11: Vol 257 Iss 6573\",\"date\":\"1961-08-11\"},{\"title\":\"Mining Journal 1836-01-16: Vol 2 Iss 21\",\"date\":\"1836-01-16\"},{\"title\":\"Mining Journal 1836-12-31: Vol 3 Iss 71\",\"date\":\"1836-12-31\"},{\"title\":\"Mining Journal 1837-09-02: Vol 5 Iss 106\",\"date\":\"1837-09-02\"},{\"title\":\"Mining Journal 1837-09-30: Vol 5 Iss 110\",\"date\":\"1837-09-30\"},{\"title\":\"Mining Journal 1838-06-16: Vol 6 Iss 147\",\"date\":\"1838-06-16\"},{\"title\":\"Mining Journal 1840-08-15: Vol 10 Iss 260\",\"date\":\"1840-08-15\"},{\"title\":\"Mining Journal 1841-08-14: Vol 11 Iss 312\",\"date\":\"1841-08-14\"},{\"title\":\"Mining Journal 1842-03-05: Vol 12 Iss 341\",\"date\":\"1842-03-05\"},{\"title\":\"Mining Journal 1845-12-13: Vol 15 Iss 538\",\"date\":\"1845-12-13\"},{\"title\":\"Mining Journal 1846-06-06: Vol 16 Iss 563\",\"date\":\"1846-06-06\"},{\"title\":\"The Mining Journal 1853-06-04: Vol 23 Iss 928\",\"date\":\"1853-06-04\"},{\"title\":\"The Mining Journal 1854-06-17: Vol 24 Supplement\",\"date\":\"1854-06-17\"},{\"title\":\"The Mining Journal 1854-09-02: Vol 24 Iss 993\",\"date\":\"1854-09-02\"},{\"title\":\"The Mining Journal 1854-09-09: Vol 24 Supplement\",\"date\":\"1854-09-09\"},{\"title\":\"The Mining Journal 1855-10-27: Vol 25 Iss 1053\",\"date\":\"1855-10-27\"},{\"title\":\"The Mining Journal 1856-08-09: Vol 26 Iss 1094\",\"date\":\"1856-08-09\"},{\"title\":\"The Mining Journal 1856: Vol 26 Index\",\"date\":\"1856-01-01\"},{\"title\":\"The Mining Journal 1857-01-10: Vol 27 Iss 1116\",\"date\":\"1857-01-10\"},{\"title\":\"The Mining Journal 1863-01-24: Vol 33 Iss 1431\",\"date\":\"1863-01-24\"},{\"title\":\"The Mining Journal 1863-05-16: Vol 33 Supplement\",\"date\":\"1863-05-16\"},{\"title\":\"The Mining Journal 1863-11-28: Vol 33 Iss 1475\",\"date\":\"1863-11-28\"},{\"title\":\"The Mining Journal 1867-04-27: Vol 37 Iss 1653\",\"date\":\"1867-04-27\"},{\"title\":\"The Mining Journal 1868-01-18: Vol 38 Iss 1691\",\"date\":\"1868-01-18\"},{\"title\":\"The Mining Journal 1868-03-07: Vol 38 Iss 1698\",\"date\":\"1868-03-07\"},{\"title\":\"The Mining Journal 1868-05-16: Vol 38 Iss 1708\",\"date\":\"1868-05-16\"},{\"title\":\"The Mining Journal 1871-02-18: Vol 41 Iss 1852\",\"date\":\"1871-02-18\"},{\"title\":\"The Mining Journal 1871-03-11: Vol 41 Iss 1855\",\"date\":\"1871-03-11\"},{\"title\":\"The Mining Journal 1871-03-25: Vol 41 Iss 1857\",\"date\":\"1871-03-25\"},{\"title\":\"The Mining Journal 1872-03-16: Vol 42 Iss 1908\",\"date\":\"1872-03-16\"},{\"title\":\"The Mining Journal 1875-02-20: Vol 45 Supplement\",\"date\":\"1875-02-20\"},{\"title\":\"The Mining Journal 1875-03-27: Vol 45 Supplement\",\"date\":\"1875-03-27\"},{\"title\":\"The Mining Journal 1875-08-28: Vol 45 Supplement\",\"date\":\"1875-08-28\"},{\"title\":\"The Mining Journal 1875-12-25: Vol 45 Supplement\",\"date\":\"1875-12-25\"},{\"title\":\"The Mining Journal 1876-01-01: Vol 46 Iss 2106\",\"date\":\"1876-01-01\"},{\"title\":\"The Mining Journal 1876-09-02: Vol 46 Iss 2141\",\"date\":\"1876-09-02\"},{\"title\":\"The Mining Journal 1876-09-09: Vol 46 Iss 2142\",\"date\":\"1876-09-09\"},{\"title\":\"The Mining Journal 1876-09-23: Vol 46 Iss 2144\",\"date\":\"1876-09-23\"},{\"title\":\"The Mining Journal 1879-05-03: Vol 49 Iss 2280\",\"date\":\"1879-05-03\"},{\"title\":\"The Mining Journal 1879-06-21: Vol 49 Supplement\",\"date\":\"1879-06-21\"},{\"title\":\"The Mining Journal 1879-07-26: Vol 49 Iss 2292\",\"date\":\"1879-07-26\"},{\"title\":\"The Mining Journal 1879-08-16: Vol 49 Supplement\",\"date\":\"1879-08-16\"},{\"title\":\"The Mining Journal 1879-12-20: Vol 49 Iss 2313\",\"date\":\"1879-12-20\"},{\"title\":\"The Mining Journal 1880-05-29: Vol 50 Supplement\",\"date\":\"1880-05-29\"},{\"title\":\"The Mining Journal 1880-10-16: Vol 50 Iss 2356\",\"date\":\"1880-10-16\"},{\"title\":\"The Mining Journal 1880-11-20: Vol 50 Supplement\",\"date\":\"1880-11-20\"},{\"title\":\"The Mining Journal 1881-02-19: Vol 51 Supplement\",\"date\":\"1881-02-19\"},{\"title\":\"The Mining Journal 1881-07-23: Vol 51 Iss 2396\",\"date\":\"1881-07-23\"},{\"title\":\"The Mining Journal 1881-08-20: Vol 51 Iss 2400\",\"date\":\"1881-08-20\"},{\"title\":\"The Mining Journal 1882-08-12: Vol 52 Iss 2451\",\"date\":\"1882-08-12\"},{\"title\":\"The Mining Journal 1885-07-11: Vol 55 Iss 2603\",\"date\":\"1885-07-11\"},{\"title\":\"The Mining Journal 1885-09-12: Vol 55 Iss 2612\",\"date\":\"1885-09-12\"},{\"title\":\"The Mining Journal 1894-06-02: Vol 64 Iss 3067\",\"date\":\"1894-06-02\"},{\"title\":\"The Mining Journal 1955-08-26: Vol 245 Iss 6262\",\"date\":\"1955-08-26\"},{\"title\":\"The Mining Journal 1956-09-21: Vol 247 Iss 6318\",\"date\":\"1956-09-21\"},{\"title\":\"The Mining Journal 1956-11-09: Vol 247 Iss 6325\",\"date\":\"1956-11-09\"},{\"title\":\"The Mining Journal 1957-01-04: Vol 248 Iss 6333\",\"date\":\"1957-01-04\"},{\"title\":\"The Mining Journal 1959-02-27: Vol 252 Iss 6445\",\"date\":\"1959-02-27\"},{\"title\":\"The Mining Magazine 1959-03: Vol 100 Iss 3\",\"date\":\"1959-03-01\"},{\"title\":\"Mining Journal January-June 1989: Vol 312-160 Index\",\"date\":\"1989-01-01\"},{\"title\":\"Mining Journal 1845-03-01: Vol 15 Iss 497\",\"date\":\"1845-03-01\"},{\"title\":\"Mining Journal 1847-12-18: Vol 17 Iss 643\",\"date\":\"1847-12-18\"},{\"title\":\"Mining Journal 1848-01-15: Vol 18 Iss 647\",\"date\":\"1848-01-15\"},{\"title\":\"The Mining Journal 1865-07-22: Vol 35 Iss 1561\",\"date\":\"1865-07-22\"},{\"title\":\"The Mining Journal 1866-04-28: Vol 36 Iss 1601\",\"date\":\"1866-04-28\"},{\"title\":\"The Mining Journal 1866-09-01: Vol 36 Iss 1619\",\"date\":\"1866-09-01\"},{\"title\":\"The Mining Journal 1866-09-15: Vol 36 Iss 1621\",\"date\":\"1866-09-15\"},{\"title\":\"The Mining Journal 1867-01-05: Vol 37 Supplement\",\"date\":\"1867-01-05\"},{\"title\":\"The Mining Journal 1867-06-29: Vol 37 Iss 1662\",\"date\":\"1867-06-29\"},{\"title\":\"The Mining Journal 1868-12-05: Vol 38 Iss 1737\",\"date\":\"1868-12-05\"},{\"title\":\"The Mining Journal 1872-01-27: Vol 42 Supplement\",\"date\":\"1872-01-27\"},{\"title\":\"The Mining Journal 1883-01-06: Vol 53 Iss 2472\",\"date\":\"1883-01-06\"},{\"title\":\"The Mining Journal 1895-07-13: Vol 65 Iss 3125\",\"date\":\"1895-07-13\"},{\"title\":\"The Mining Journal 1951-04-20: Vol 236 Iss 6035\",\"date\":\"1951-04-20\"},{\"title\":\"The Mining Journal 1951-10-12: Vol 237 Iss 6060\",\"date\":\"1951-10-12\"},{\"title\":\"The Mining Journal 1952-01-04: Vol 238 Iss 6072\",\"date\":\"1952-01-04\"},{\"title\":\"The Mining Journal 1958-04-04: Vol 250 Iss 6398\",\"date\":\"1958-04-04\"},{\"title\":\"The Mining Journal 1958-05-23: Vol 250 Iss 6405\",\"date\":\"1958-05-23\"},{\"title\":\"The Mining Magazine 1958-05: Vol 98 Iss 5\",\"date\":\"1958-05-01\"},{\"title\":\"The Mining Journal 1958-08-29: Vol 251 Iss 6419\",\"date\":\"1958-08-29\"},{\"title\":\"The Mining Journal 1959-01-02: Vol 252 Iss 6437\",\"date\":\"1959-01-02\"},{\"title\":\"The Mining Journal 1959-03-13: Vol 252 Iss 6447\",\"date\":\"1959-03-13\"},{\"title\":\"The Mining Journal 1959-05-01: Vol 252 Supplement\",\"date\":\"1959-05-01\"},{\"title\":\"The Mining Journal 1959-08-21: Vol 253 Iss 6470\",\"date\":\"1959-08-21\"},{\"title\":\"The Mining Journal 1959-10-16: Vol 253 Iss 6478\",\"date\":\"1959-10-16\"},{\"title\":\"The Mining Journal 1960-06-17: Vol 254 Iss 6513\",\"date\":\"1960-06-17\"},{\"title\":\"The Mining Journal 1960-08-19: Vol 254 Iss 6522\",\"date\":\"1960-08-19\"},{\"title\":\"The Mining Journal 1961-06-23: Vol 256 Iss 6566\",\"date\":\"1961-06-23\"},{\"title\":\"The Mining Journal 1961-09-22: Vol 257 Iss 6579\",\"date\":\"1961-09-22\"},{\"title\":\"Mining Journal 1840-03-21: Vol 10 Iss 239\",\"date\":\"1840-03-21\"},{\"title\":\"Mining Journal 1851-08-30: Vol 21 Iss 836\",\"date\":\"1851-08-30\"},{\"title\":\"The Mining Journal 1856-03-08: Vol 26 Iss 1072\",\"date\":\"1856-03-08\"},{\"title\":\"The Mining Journal 1862-10-11: Vol 32 Iss 1416\",\"date\":\"1862-10-11\"},{\"title\":\"The Mining Journal 1863-04-18: Vol 33 Iss 1443\",\"date\":\"1863-04-18\"},{\"title\":\"The Mining Journal 1863-06-27: Vol 33 Iss 1453\",\"date\":\"1863-06-27\"},{\"title\":\"The Mining Journal 1870-07-23: Vol 40 Supplement\",\"date\":\"1870-07-23\"},{\"title\":\"The Mining Journal 1874-03-07: Vol 44 Iss 2011\",\"date\":\"1874-03-07\"},{\"title\":\"The Mining Journal 1878-06-01: Vol 48 Supplement\",\"date\":\"1878-06-01\"},{\"title\":\"The Mining Journal 1878-08-24: Vol 48 Supplement\",\"date\":\"1878-08-24\"},{\"title\":\"The Mining Journal 1879-06-07: Vol 49 Supplement\",\"date\":\"1879-06-07\"},{\"title\":\"The Mining Journal 1879-06-14: Vol 49 Supplement\",\"date\":\"1879-06-14\"},{\"title\":\"The Mining Journal 1880-09-25: Vol 50 Supplement\",\"date\":\"1880-09-25\"},{\"title\":\"The Mining Journal 1871-11-18: Vol 41 Iss 1891\",\"date\":\"1871-11-18\"},{\"title\":\"The Mining Journal 1877-09-15: Vol 47 Supplement\",\"date\":\"1877-09-15\"},{\"title\":\"The Mining Journal 1877-09-22: Vol 47 Supplement\",\"date\":\"1877-09-22\"},{\"title\":\"The Mining Journal 1880-01-31: Vol 50 Supplement\",\"date\":\"1880-01-31\"},{\"title\":\"The Mining Journal 1869-06-19: Vol 39 Supplement\",\"date\":\"1869-06-19\"},{\"title\":\"The Mining Journal 1875-01-16: Vol 45 Supplement\",\"date\":\"1875-01-16\"},{\"title\":\"The Mining Journal 1875-05-08: Vol 45 Supplement\",\"date\":\"1875-05-08\"},{\"title\":\"The Mining Journal 1881-10-15: Vol 51 Supplement\",\"date\":\"1881-10-15\"},{\"title\":\"The Mining Journal 1884-11-15: Vol 54 Supplement\",\"date\":\"1884-11-15\"},{\"title\":\"Mining Journal 1851-09-06: Vol 21 Iss 837\",\"date\":\"1851-09-06\"},{\"title\":\"The Mining Journal 1857-08-15: Vol 27 Iss 1147\",\"date\":\"1857-08-15\"},{\"title\":\"The Mining Journal 1867-10-05: Vol 37 Iss 1676\",\"date\":\"1867-10-05\"},{\"title\":\"The Mining Journal 1871-03-04: Vol 41 Supplement\",\"date\":\"1871-03-04\"},{\"title\":\"The Mining Journal 1875-12-04: Vol 45 Iss 2102\",\"date\":\"1875-12-04\"},{\"title\":\"The Mining Journal 1876-01-15: Vol 46 Supplement\",\"date\":\"1876-01-15\"},{\"title\":\"The Mining Journal 1879-05-17: Vol 49 Supplement\",\"date\":\"1879-05-17\"},{\"title\":\"The Mining Journal 1881-12-17: Vol 51 Iss 2417\",\"date\":\"1881-12-17\"},{\"title\":\"The Mining Journal 1882-01-21: Vol 52 Supplement\",\"date\":\"1882-01-21\"},{\"title\":\"The Mining Journal 1882-03-25: Vol 52 Supplement\",\"date\":\"1882-03-25\"},{\"title\":\"The Mining Journal 1884-05-03: Vol 54 Supplement\",\"date\":\"1884-05-03\"},{\"title\":\"The Mining Journal 1884-07-05: Vol 54 Supplement\",\"date\":\"1884-07-05\"},{\"title\":\"The Mining Journal 1896-03-28: Vol 66 Iss 3162\",\"date\":\"1896-03-28\"},{\"title\":\"The Mining Journal 1959-07-10: Vol 253 Supplement\",\"date\":\"1959-07-10\"},{\"title\":\"The Mining Journal Magazine 1959-09: Vol 101 Iss 3\",\"date\":\"1959-09-01\"},{\"title\":\"Mining Journal 1843-06-10: Vol 13 Iss 407\",\"date\":\"1843-06-10\"},{\"title\":\"Mining Journal 1843-12-16: Vol 13 Iss 434\",\"date\":\"1843-12-16\"},{\"title\":\"Mining Journal 1850-09-14: Vol 20 Iss 786\",\"date\":\"1850-09-14\"},{\"title\":\"Mining Journal 1852: Vol 22 Index\",\"date\":\"1852-01-01\"},{\"title\":\"Mining Journal 1851-12-20: Vol 21 Iss 852\",\"date\":\"1851-12-20\"},{\"title\":\"Mining Journal 1852-04-03: Vol 22 Iss 867\",\"date\":\"1852-04-03\"},{\"title\":\"The Mining Journal 1862-08-23: Vol 32 Iss 1409\",\"date\":\"1862-08-23\"},{\"title\":\"The Mining Journal 1869-05-08: Vol 39 Supplement\",\"date\":\"1869-05-08\"},{\"title\":\"The Mining Journal 1869-05-29: Vol 39 Supplement\",\"date\":\"1869-05-29\"},{\"title\":\"The Mining Journal 1869-06-12: Vol 39 Supplement\",\"date\":\"1869-06-12\"},{\"title\":\"The Mining Journal 1870-10-29: Vol 40 Supplement\",\"date\":\"1870-10-29\"},{\"title\":\"The Mining Journal 1871-09-02: Vol 41 Supplement\",\"date\":\"1871-09-02\"},{\"title\":\"The Mining Journal 1871-12-30: Vol 41 Supplement\",\"date\":\"1871-12-30\"},{\"title\":\"The Mining Journal 1876-09-23: Vol 46 Supplement\",\"date\":\"1876-09-23\"},{\"title\":\"The Mining Journal 1877-11-03: Vol 47 Supplement\",\"date\":\"1877-11-03\"},{\"title\":\"The Mining Journal 1879-08-09: Vol 49 Supplement\",\"date\":\"1879-08-09\"},{\"title\":\"The Mining Journal 1885-10-31: Vol 55 Iss 2619\",\"date\":\"1885-10-31\"},{\"title\":\"The Mining Journal 1894-11-17: Vol 64 Iss 3091\",\"date\":\"1894-11-17\"},{\"title\":\"Mining Journal 1998: Vol 331 Index\",\"date\":\"1998-01-01\"},{\"title\":\"Mining Journal 1836-08-20: Vol 3 Iss 52\",\"date\":\"1836-08-20\"},{\"title\":\"Mining Journal 1836-09-24: Vol 3 Iss 57\",\"date\":\"1836-09-24\"},{\"title\":\"Mining Journal 1837: Vol 7 Index\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1848-01-08: Vol 18 Iss 646\",\"date\":\"1848-01-08\"},{\"title\":\"Mining Journal 1841-01-02: Vol 11 Iss 280\",\"date\":\"1841-01-02\"},{\"title\":\"Mining Journal 1851-04-26: Vol 21 Iss 818\",\"date\":\"1851-04-26\"},{\"title\":\"The Mining Journal 1854-04-08: Vol 24 Iss 972\",\"date\":\"1854-04-08\"},{\"title\":\"The Mining Journal 1855-07-21: Vol 25 Iss 1039\",\"date\":\"1855-07-21\"},{\"title\":\"The Mining Journal 1855-12-08: Vol 25 Iss 1059\",\"date\":\"1855-12-08\"},{\"title\":\"The Mining Journal 1857-05-09: Vol 27 Supplement\",\"date\":\"1857-05-09\"},{\"title\":\"The Mining Journal 1857-12-12: Vol 27 Iss 1164\",\"date\":\"1857-12-12\"},{\"title\":\"The Mining Journal 1862-04-05: Vol 32 Iss 1389\",\"date\":\"1862-04-05\"},{\"title\":\"The Mining Journal 1867: Vol 37 Index\",\"date\":\"1867-01-01\"},{\"title\":\"The Mining Journal 1868-06-20: Vol 38 Iss 1713\",\"date\":\"1868-06-20\"},{\"title\":\"The Mining Journal 1867-08-10: Vol 37 Iss 1668\",\"date\":\"1867-08-10\"},{\"title\":\"The Mining Journal 1867-08-17: Vol 37 Iss 1669\",\"date\":\"1867-08-17\"},{\"title\":\"The Mining Journal 1872-06-01: Vol 42 Supplement\",\"date\":\"1872-06-01\"},{\"title\":\"The Mining Journal 1872-09-28: Vol 42 Supplement\",\"date\":\"1872-09-28\"},{\"title\":\"The Mining Journal 1873-02-01: Vol 43 Iss 1954\",\"date\":\"1873-02-01\"},{\"title\":\"The Mining Journal 1873-03-01: Vol 43 Supplement\",\"date\":\"1873-03-01\"},{\"title\":\"The Mining Journal 1873-11-15: Vol 43 Iss 1995\",\"date\":\"1873-11-15\"},{\"title\":\"The Mining Journal 1874-01-24: Vol 44 Supplement\",\"date\":\"1874-01-24\"},{\"title\":\"The Mining Journal 1877-03-17: Vol 47 Supplement\",\"date\":\"1877-03-17\"},{\"title\":\"The Mining Journal 1877-11-17: Vol 47 Supplement\",\"date\":\"1877-11-17\"},{\"title\":\"The Mining Journal 1881-03-26: Vol 51 Supplement\",\"date\":\"1881-03-26\"},{\"title\":\"The Mining Journal 1881-05-28: Vol 51 Supplement\",\"date\":\"1881-05-28\"},{\"title\":\"The Mining Journal 1881-10-08: Vol 51 Supplement\",\"date\":\"1881-10-08\"},{\"title\":\"The Mining Journal 1884-08-30: Vol 54 Supplement\",\"date\":\"1884-08-30\"},{\"title\":\"The Mining Journal 1884-10-11: Vol 54 Supplement\",\"date\":\"1884-10-11\"},{\"title\":\"The Mining Journal 1883-06-16: Vol 53 Iss 2495\",\"date\":\"1883-06-16\"},{\"title\":\"The Mining Journal 1883-07-28: Vol 53 Iss 2501\",\"date\":\"1883-07-28\"},{\"title\":\"The Mining Journal 1951-06-22: Vol 236 Iss 6044\",\"date\":\"1951-06-22\"},{\"title\":\"Mining Journal July-December 1989: Vol 313-61 Index\",\"date\":\"1989-07-01\"},{\"title\":\"Mining Journal 1839-02-09: Vol 8 Iss 181\",\"date\":\"1839-02-09\"},{\"title\":\"Mining Journal 1839-02-16: Vol 8 Iss 182\",\"date\":\"1839-02-16\"},{\"title\":\"Mining Journal 1840-01-04: Vol 10 Iss 228\",\"date\":\"1840-01-04\"},{\"title\":\"Mining Journal 1841-06-26: Vol 11 Iss 305\",\"date\":\"1841-06-26\"},{\"title\":\"Mining Journal 1842-03-26: Vol 12 Iss 344\",\"date\":\"1842-03-26\"},{\"title\":\"Mining Journal 1843-09-09: Vol 13 Iss 420\",\"date\":\"1843-09-09\"},{\"title\":\"Mining Journal 1843-11-18: Vol 13 Iss 430\",\"date\":\"1843-11-18\"},{\"title\":\"Mining Journal 1844-01-13: Vol 14 Iss 438\",\"date\":\"1844-01-13\"},{\"title\":\"Mining Journal 1842-10-22: Vol 12 Iss 374\",\"date\":\"1842-10-22\"},{\"title\":\"Mining Journal 1850-10-05: Vol 20 Iss 789\",\"date\":\"1850-10-05\"},{\"title\":\"The Mining Journal 1854-11-25: Vol 24 Iss 1005\",\"date\":\"1854-11-25\"},{\"title\":\"The Mining Journal 1861-06-29: Vol 31 Iss 1349\",\"date\":\"1861-06-29\"},{\"title\":\"The Mining Journal 1863-08-29: Vol 33 Iss 1462\",\"date\":\"1863-08-29\"},{\"title\":\"The Mining Journal 1859-06-04: Vol 29 Iss 1241\",\"date\":\"1859-06-04\"},{\"title\":\"The Mining Journal 1859-09-24: Vol 29 Iss 1257\",\"date\":\"1859-09-24\"},{\"title\":\"The Mining Journal 1859-12-03: Vol 29 Iss 1267\",\"date\":\"1859-12-03\"},{\"title\":\"The Mining Journal 1861-01-05: Vol 31 Iss 1324\",\"date\":\"1861-01-05\"},{\"title\":\"The Mining Journal 1861-04-27: Vol 31 Supplement\",\"date\":\"1861-04-27\"},{\"title\":\"The Mining Journal 1864-07-16: Vol 34 Iss 1508\",\"date\":\"1864-07-16\"},{\"title\":\"The Mining Journal 1864-10-08: Vol 34 Iss 1520\",\"date\":\"1864-10-08\"},{\"title\":\"The Mining Journal 1866-01-13: Vol 36 Iss 1586\",\"date\":\"1866-01-13\"},{\"title\":\"The Mining Journal 1870-03-26: Vol 40 Supplement\",\"date\":\"1870-03-26\"},{\"title\":\"The Mining Journal 1870-07-30: Vol 40 Supplement\",\"date\":\"1870-07-30\"},{\"title\":\"The Mining Journal 1868-11-14: Vol 38 Iss 1734\",\"date\":\"1868-11-14\"},{\"title\":\"The Mining Journal 1868-12-05: Vol 38 Supplement\",\"date\":\"1868-12-05\"},{\"title\":\"The Mining Journal 1869-02-06: Vol 39 Supplement\",\"date\":\"1869-02-06\"},{\"title\":\"The Mining Journal 1871: Vol 41 Index\",\"date\":\"1871-01-01\"},{\"title\":\"The Mining Journal 1871-04-15: Vol 41 Iss 1860\",\"date\":\"1871-04-15\"},{\"title\":\"The Mining Journal 1871-05-27: Vol 41 Supplement\",\"date\":\"1871-05-27\"},{\"title\":\"The Mining Journal 1871-09-16: Vol 41 Iss 1882\",\"date\":\"1871-09-16\"},{\"title\":\"The Mining Journal 1876-01-08: Vol 46 Supplement\",\"date\":\"1876-01-08\"},{\"title\":\"The Mining Journal 1876-01-29: Vol 46 Supplement\",\"date\":\"1876-01-29\"},{\"title\":\"The Mining Journal 1876-02-26: Vol 46 Supplement\",\"date\":\"1876-02-26\"},{\"title\":\"The Mining Journal 1876-06-17: Vol 46 Supplement\",\"date\":\"1876-06-17\"},{\"title\":\"The Mining Journal 1876-11-25: Vol 46 Iss 2153\",\"date\":\"1876-11-25\"},{\"title\":\"The Mining Journal 1877-03-10: Vol 47 Supplement\",\"date\":\"1877-03-10\"},{\"title\":\"The Mining Journal 1877-12-22: Vol 47 Iss 2209\",\"date\":\"1877-12-22\"},{\"title\":\"The Mining Journal 1878-04-27: Vol 48 Iss 2227\",\"date\":\"1878-04-27\"},{\"title\":\"The Mining Journal 1878-06-15: Vol 48 Supplement\",\"date\":\"1878-06-15\"},{\"title\":\"The Mining Journal 1879-12-06: Vol 49 Supplement\",\"date\":\"1879-12-06\"},{\"title\":\"The Mining Journal 1880-03-27: Vol 50 Iss 2327\",\"date\":\"1880-03-27\"},{\"title\":\"The Mining Journal 1880-11-13: Vol 50 Iss 2360\",\"date\":\"1880-11-13\"},{\"title\":\"The Mining Journal 1880-12-11: Vol 50 Supplement\",\"date\":\"1880-12-11\"},{\"title\":\"The Mining Journal 1894-01-20: Vol 64 Iss 3048\",\"date\":\"1894-01-20\"},{\"title\":\"The Mining Journal 1894-08-18: Vol 64 Iss 3078\",\"date\":\"1894-08-18\"},{\"title\":\"The Mining Journal 1894-12-29: Vol 64 Iss 3097\",\"date\":\"1894-12-29\"},{\"title\":\"The Mining Journal 1895-02-09: Vol 65 Iss 3103\",\"date\":\"1895-02-09\"},{\"title\":\"The Mining Journal 1895-06-01: Vol 65 Iss 3119\",\"date\":\"1895-06-01\"},{\"title\":\"The Mining Journal 1896-02-15: Vol 66 Iss 3156\",\"date\":\"1896-02-15\"},{\"title\":\"The Mining Journal 1896-04-18: Vol 66 Iss 3165\",\"date\":\"1896-04-18\"},{\"title\":\"The Mining Journal 1896-06-13: Vol 66 Iss 3173\",\"date\":\"1896-06-13\"},{\"title\":\"The Mining Journal 1953-08-07: Vol 241 Iss 6155\",\"date\":\"1953-08-07\"},{\"title\":\"The Mining Journal 1959-06-19: Vol 252 Iss 6461\",\"date\":\"1959-06-19\"},{\"title\":\"The Mining Journal 1959-06-26: Vol 252 Iss 6462\",\"date\":\"1959-06-26\"},{\"title\":\"The Mining Magazine 1959-07: Vol 101 Iss 1\",\"date\":\"1959-07-01\"},{\"title\":\"The Mining Journal 1959-10-30: Vol 253 Iss 6480\",\"date\":\"1959-10-30\"},{\"title\":\"Mining Journal 1970: Vol 274-275 Index\",\"date\":\"1970-01-01\"},{\"title\":\"Mining Journal 1972: Vol 278 Index\",\"date\":\"1972-01-01\"},{\"title\":\"The Mining Journal 1961-10-06: Vol 257 Iss 6581\",\"date\":\"1961-10-06\"},{\"title\":\"Mining Journal 1842-03-19: Vol 12 Iss 343\",\"date\":\"1842-03-19\"},{\"title\":\"Mining Journal 1847-02-20: Vol 17 Iss 600\",\"date\":\"1847-02-20\"},{\"title\":\"The Mining Journal 1867-03-02: Vol 37 Supplement\",\"date\":\"1867-03-02\"},{\"title\":\"The Mining Journal 1868-02-08: Vol 38 Supplement\",\"date\":\"1868-02-08\"},{\"title\":\"The Mining Journal 1870-03-19: Vol 40 Supplement\",\"date\":\"1870-03-19\"},{\"title\":\"The Mining Journal 1879-01-04: Vol 49 Supplement\",\"date\":\"1879-01-04\"},{\"title\":\"The Mining Journal 1879-02-01: Vol 49 Supplement\",\"date\":\"1879-02-01\"},{\"title\":\"The Mining Journal 1895-09-28: Vol 65 Iss 3136\",\"date\":\"1895-09-28\"},{\"title\":\"The Mining Journal 1854-02-18: Vol 24 Iss 965\",\"date\":\"1854-02-18\"},{\"title\":\"The Mining Journal 1854-03-25: Vol 24 Iss 970\",\"date\":\"1854-03-25\"},{\"title\":\"The Mining Journal 1856-10-25: Vol 26 Iss 1105\",\"date\":\"1856-10-25\"},{\"title\":\"The Mining Journal 1872-02-17: Vol 42 Supplement\",\"date\":\"1872-02-17\"},{\"title\":\"The Mining Journal 1876-03-25: Vol 46 Iss 2118\",\"date\":\"1876-03-25\"},{\"title\":\"The Mining Journal 1878-05-18: Vol 48 Iss 2230\",\"date\":\"1878-05-18\"},{\"title\":\"The Mining Journal 1880-03-20: Vol 50 Iss 2326\",\"date\":\"1880-03-20\"},{\"title\":\"Mining Journal July-December 1990: Vol 315-163 Index\",\"date\":\"1990-07-01\"},{\"title\":\"The Mining Journal 1883-08-11: Vol 53 Supplement\",\"date\":\"1883-08-11\"},{\"title\":\"The Mining Journal 1883-08-18: Vol 53 Supplement\",\"date\":\"1883-08-18\"},{\"title\":\"The Mining Journal 1883-09-22: Vol 53 Iss 2509\",\"date\":\"1883-09-22\"},{\"title\":\"The Mining Journal 1885-11-21: Vol 55 Iss 2622\",\"date\":\"1885-11-21\"},{\"title\":\"The Mining Journal 1894-03-03: Vol 64 Iss 3054\",\"date\":\"1894-03-03\"},{\"title\":\"The Mining Journal 1894-05-19: Vol 64 Iss 3065\",\"date\":\"1894-05-19\"},{\"title\":\"The Mining Journal 1883-11-24: Vol 53 Iss 2518\",\"date\":\"1883-11-24\"},{\"title\":\"The Mining Journal 1883-12-08: Vol 53 Supplement\",\"date\":\"1883-12-08\"},{\"title\":\"The Mining Journal 1895-01-19: Vol 65 Iss 3100\",\"date\":\"1895-01-19\"},{\"title\":\"The Mining Journal 1951-09-21: Vol 237 Iss 6057\",\"date\":\"1951-09-21\"},{\"title\":\"The Mining Journal 1951-09-28: Vol 237 Iss 6058\",\"date\":\"1951-09-28\"},{\"title\":\"The Mining Journal 1896-06-06: Vol 66 Iss 3172\",\"date\":\"1896-06-06\"},{\"title\":\"Mining Journal 1835-10-31: Vol 1 Iss 10\",\"date\":\"1835-10-31\"},{\"title\":\"Mining Journal 1837: Vol 4 Supplement\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1845-11-08: Vol 15 Iss 533\",\"date\":\"1845-11-08\"},{\"title\":\"The Mining Journal 1853-11-19: Vol 23 Iss 952\",\"date\":\"1853-11-19\"},{\"title\":\"The Mining Journal 1864-10-22: Vol 34 Iss 1522\",\"date\":\"1864-10-22\"},{\"title\":\"The Mining Journal 1867-11-16: Vol 37 Supplement\",\"date\":\"1867-11-16\"},{\"title\":\"The Mining Journal 1872-04-20: Vol 42 Iss 1913\",\"date\":\"1872-04-20\"},{\"title\":\"The Mining Journal 1870-12-03: Vol 40 Supplement\",\"date\":\"1870-12-03\"},{\"title\":\"The Mining Journal 1875-02-13: Vol 45 Supplement\",\"date\":\"1875-02-13\"},{\"title\":\"The Mining Journal 1875-05-29: Vol 45 Supplement\",\"date\":\"1875-05-29\"},{\"title\":\"The Mining Journal 1875-06-19: Vol 45 Iss 2078\",\"date\":\"1875-06-19\"},{\"title\":\"The Mining 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1940-02: Vol 32 Iss 8\",\"date\":\"1940-02-01\"},{\"title\":\"Pit and Quarry 1944-07: Vol 37 Iss 1\",\"date\":\"1944-07-01\"},{\"title\":\"Pit and Quarry 1953-09: Vol 46 Iss 3\",\"date\":\"1953-09-01\"},{\"title\":\"Pit & Quarry 1923-01: Vol 7 Iss 4\",\"date\":\"1923-01-01\"},{\"title\":\"Pit & Quarry 1934-11: Vol 27 Iss 5\",\"date\":\"1934-11-01\"},{\"title\":\"Pit & Quarry 1935-09: Vol 28 Iss 3\",\"date\":\"1935-09-01\"},{\"title\":\"Pit and Quarry 1946-02: Vol 38 Iss 8\",\"date\":\"1946-02-01\"},{\"title\":\"Pit and Quarry 1956-04: Vol 48 Iss 10\",\"date\":\"1956-04-01\"},{\"title\":\"Pit and Quarry 1958-06: Vol 50 Iss 12\",\"date\":\"1958-06-01\"},{\"title\":\"Pit & Quarry 1932-01-13: Vol 23 Iss 8\",\"date\":\"1932-01-13\"},{\"title\":\"Pit & Quarry 1933-09: Vol 26 Iss 3\",\"date\":\"1933-09-01\"},{\"title\":\"Pit and Quarry 1940-06: Vol 32 Iss 12\",\"date\":\"1940-06-01\"},{\"title\":\"Pit & Quarry 1919-03: Vol 3 Iss 6\",\"date\":\"1919-03-01\"},{\"title\":\"Pit & Quarry 1919-04: 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7\",\"date\":\"1933-03-01\"},{\"title\":\"Pit and Quarry 1936-09: Vol 29 Iss 3\",\"date\":\"1936-09-01\"},{\"title\":\"Pit and Quarry 1946-03: Vol 38 Iss 9\",\"date\":\"1946-03-01\"},{\"title\":\"Pit and Quarry 1945-11: Vol 38 Iss 5\",\"date\":\"1945-11-01\"},{\"title\":\"Pit and Quarry 1951-03: Vol 43 Iss 9\",\"date\":\"1951-03-01\"},{\"title\":\"Pit and Quarry 1951-12: Vol 44 Iss 6\",\"date\":\"1951-12-01\"},{\"title\":\"Pit and Quarry 1953-11: Vol 46 Iss 5\",\"date\":\"1953-11-01\"},{\"title\":\"Pit and Quarry 1954-01: Vol 46 Iss 7\",\"date\":\"1954-01-01\"},{\"title\":\"Pit & Quarry 1925-09-15: Vol 10 Iss 12\",\"date\":\"1925-09-15\"},{\"title\":\"Pit and Quarry 1937-12: Vol 30 Iss 6\",\"date\":\"1937-12-01\"},{\"title\":\"Pit & Quarry 1938-02: Vol 30 Iss 8\",\"date\":\"1938-02-01\"},{\"title\":\"Pit & Quarry 1939-06: Vol 31 Iss 12\",\"date\":\"1939-06-01\"},{\"title\":\"Pit & Quarry 1940-05: Vol 32 Iss 11\",\"date\":\"1940-05-01\"},{\"title\":\"Pit and Quarry 1940-07: Vol 33 Iss 1\",\"date\":\"1940-07-01\"},{\"title\":\"Pit and Quarry 1947-03: Vol 39 Iss 9\",\"date\":\"1947-03-01\"},{\"title\":\"Pit and Quarry 1947-04: Vol 39 Iss 10\",\"date\":\"1947-04-01\"},{\"title\":\"Pit & Quarry 1941-03: Vol 33 Iss 9\",\"date\":\"1941-03-01\"},{\"title\":\"Pit and Quarry 1942-01: Vol 34 Iss 7\",\"date\":\"1942-01-01\"},{\"title\":\"Pit & Quarry 1942-02: Vol 34 Iss 8\",\"date\":\"1942-02-01\"},{\"title\":\"Pit and Quarry 1953-10: Vol 46 Iss 4\",\"date\":\"1953-10-01\"},{\"title\":\"Pit & Quarry 1964: Vol 57 Index\",\"date\":\"1964-01-01\"},{\"title\":\"Pit & Quarry 1983: Vol 75 Index\",\"date\":\"1983-01-01\"},{\"title\":\"Pit and Quarry 1959-05: Vol 51 Iss 11\",\"date\":\"1959-05-01\"},{\"title\":\"Pit and Quarry 1959-08: Vol 52 Iss 2\",\"date\":\"1959-08-01\"},{\"title\":\"Pit and Quarry 1960-05: Vol 52 Iss 11\",\"date\":\"1960-05-01\"},{\"title\":\"Pit & Quarry 1961-03: Vol 53 Iss 9\",\"date\":\"1961-03-01\"},{\"title\":\"Pit & Quarry 1933-04: Vol 25 Iss 8\",\"date\":\"1933-04-01\"},{\"title\":\"Pit & Quarry 1927-11-09: Vol 15 Iss 3\",\"date\":\"1927-11-09\"},{\"title\":\"Pit & Quarry 1948-07: Vol 41 Iss 1\",\"date\":\"1948-07-01\"},{\"title\":\"Pit and Quarry 1949-01: Vol 41 Iss 7\",\"date\":\"1949-01-01\"},{\"title\":\"Pit & Quarry 1950-01: Vol 42 Iss 7\",\"date\":\"1950-01-01\"},{\"title\":\"Pit & Quarry 1925-04-01: Vol 10 Iss 1\",\"date\":\"1925-04-01\"},{\"title\":\"Pit & Quarry 1925-05-01: Vol 10 Iss 3\",\"date\":\"1925-05-01\"},{\"title\":\"Pit & Quarry 1931-01-14: Vol 21 Iss 8\",\"date\":\"1931-01-14\"},{\"title\":\"Pit & Quarry 1931-05-06: Vol 22 Iss 3\",\"date\":\"1931-05-06\"},{\"title\":\"Pit & Quarry 1931-05-20: Vol 22 Iss 4\",\"date\":\"1931-05-20\"},{\"title\":\"Pit & Quarry 1931-06-17: Vol 22 Iss 6\",\"date\":\"1931-06-17\"},{\"title\":\"Pit & Quarry 1929-09-25: Vol 18 Iss 13\",\"date\":\"1929-09-25\"},{\"title\":\"Pit & Quarry 1937-07: Vol 30 Iss 1\",\"date\":\"1937-07-01\"},{\"title\":\"Pit & Quarry 1926-11-24: Vol 13 Iss 4\",\"date\":\"1926-11-24\"},{\"title\":\"Pit & Quarry 1928-02-01: Vol 15 Iss 9\",\"date\":\"1928-02-01\"},{\"title\":\"Pit and Quarry 1939-02: Vol 31 Iss 8\",\"date\":\"1939-02-01\"},{\"title\":\"Pit and Quarry 1941-02: Vol 33 Iss 8\",\"date\":\"1941-02-01\"},{\"title\":\"Pit and Quarry 1946-12: Vol 39 Iss 6\",\"date\":\"1946-12-01\"},{\"title\":\"Pit & Quarry 1947-07: Vol 40 Iss 1\",\"date\":\"1947-07-01\"},{\"title\":\"Pit and Quarry 1952-12: Vol 45 Iss 6\",\"date\":\"1952-12-01\"},{\"title\":\"Pit and Quarry 1948-05: Vol 40 Iss 11\",\"date\":\"1948-05-01\"},{\"title\":\"Pit and Quarry 1949-11: Vol 42 Iss 5\",\"date\":\"1949-11-01\"},{\"title\":\"Pit & Quarry 1916-12: Vol 1 Iss 3\",\"date\":\"1916-12-01\"},{\"title\":\"Pit & Quarry 1920-06: Vol 4 Iss 9\",\"date\":\"1920-06-01\"},{\"title\":\"Pit & Quarry 1932-07-13: Vol 24 Iss 8\",\"date\":\"1932-07-13\"},{\"title\":\"Pit & Quarry 1943-10: Vol 36 Iss 4\",\"date\":\"1943-10-01\"},{\"title\":\"Pit and Quarry 1944-06: Vol 36 Iss 12\",\"date\":\"1944-06-01\"},{\"title\":\"Pit and Quarry 1945-07: Vol 38 Iss 1\",\"date\":\"1945-07-01\"},{\"title\":\"Pit & Quarry 1942-08: Vol 35 Iss 2\",\"date\":\"1942-08-01\"},{\"title\":\"Pit and Quarry 1954-09: Vol 47 Iss 3\",\"date\":\"1954-09-01\"},{\"title\":\"Pit & Quarry 1960-10: Vol 53 Iss 4\",\"date\":\"1960-10-01\"},{\"title\":\"Pit & Quarry 1923-03: Vol 7 Iss 6\",\"date\":\"1923-03-01\"},{\"title\":\"Pit & Quarry 1920-11: Vol 5 Iss 2\",\"date\":\"1920-11-01\"},{\"title\":\"Pit and Quarry 1956-05: Vol 48 Iss 11\",\"date\":\"1956-05-01\"},{\"title\":\"Pit and Quarry 1957-04: Vol 49 Iss 10\",\"date\":\"1957-04-01\"},{\"title\":\"Pit & Quarry 1916-11: Vol 1 Iss 2\",\"date\":\"1916-11-01\"},{\"title\":\"Pit & Quarry 1920-10: Vol 5 Iss 1\",\"date\":\"1920-10-01\"},{\"title\":\"Pit & Quarry 1921-08: Vol 5 Iss 11\",\"date\":\"1921-08-01\"},{\"title\":\"Pit and Quarry 1936-10: Vol 29 Iss 4\",\"date\":\"1936-10-01\"},{\"title\":\"Pit & Quarry 1936-10: Vol 29 Iss 4\",\"date\":\"1936-10-01\"},{\"title\":\"Pit and Quarry 1938-05: Vol 30 Iss 11\",\"date\":\"1938-05-01\"},{\"title\":\"Pit and Quarry 1939-10: Vol 32 Iss 4\",\"date\":\"1939-10-01\"},{\"title\":\"Pit and Quarry 1940-03: Vol 32 Iss 9\",\"date\":\"1940-03-01\"},{\"title\":\"Pit and Quarry 1946-11: Vol 39 Iss 5\",\"date\":\"1946-11-01\"},{\"title\":\"Pit & Quarry 1946-11: Vol 39 Iss 5\",\"date\":\"1946-11-01\"},{\"title\":\"Pit and Quarry 1943-08: Vol 36 Iss 2\",\"date\":\"1943-08-01\"},{\"title\":\"Pit and Quarry 1957-07: Vol 50 Iss 1\",\"date\":\"1957-07-01\"},{\"title\":\"Pit and Quarry 1957-09: Vol 50 Iss 3\",\"date\":\"1957-09-01\"},{\"title\":\"Pit & Quarry 1972 - 1973: Vol 65 Index\",\"date\":\"1972-01-01\"},{\"title\":\"Pit and Quarry July 1959-June 1960: Vol 52 Index\",\"date\":\"1959-07-01\"},{\"title\":\"Pit and Quarry 1959-09: Vol 52 Iss 3\",\"date\":\"1959-09-01\"},{\"title\":\"Pit and Quarry 1960-02: Vol 52 Iss 8\",\"date\":\"1960-02-01\"},{\"title\":\"Pit & Quarry 1931-02-25: Vol 21 Iss 11\",\"date\":\"1931-02-25\"},{\"title\":\"Pit & Quarry 1931-03-11: Vol 21 Iss 12\",\"date\":\"1931-03-11\"},{\"title\":\"Pit & Quarry 1933-11: Vol 26 Iss 5\",\"date\":\"1933-11-01\"},{\"title\":\"Pit & Quarry 1934-12: Vol 27 Iss 6\",\"date\":\"1934-12-01\"},{\"title\":\"Pit & Quarry 1935-01: Vol 27 Iss 7\",\"date\":\"1935-01-01\"},{\"title\":\"Pit & Quarry 1935-12: Vol 28 Iss 6\",\"date\":\"1935-12-01\"},{\"title\":\"Pit & Quarry 1926 - 1927: Vol 13 Index\",\"date\":\"1926-01-01\"},{\"title\":\"Pit & Quarry 1943-08: Vol 36 Iss 2\",\"date\":\"1943-08-01\"},{\"title\":\"Pit and Quarry 1944-03: Vol 36 Iss 9\",\"date\":\"1944-03-01\"},{\"title\":\"Pit and Quarry 1945-01: Vol 37 Iss 7\",\"date\":\"1945-01-01\"},{\"title\":\"Pit & Quarry 1950-05: Vol 42 Iss 11\",\"date\":\"1950-05-01\"},{\"title\":\"Pit and Quarry 1952-02: Vol 44 Iss 8\",\"date\":\"1952-02-01\"},{\"title\":\"Pit and Quarry 1952-10: Vol 45 Iss 4\",\"date\":\"1952-10-01\"},{\"title\":\"Pit and Quarry 1949-04: Vol 41 Iss 10\",\"date\":\"1949-04-01\"},{\"title\":\"Pit and Quarry 1949-10: Vol 42 Iss 4\",\"date\":\"1949-10-01\"},{\"title\":\"Pit & Quarry 1918-01: Vol 2 Iss 2\",\"date\":\"1918-01-01\"},{\"title\":\"Pit and Quarry 1946-06: Vol 38 Iss 12\",\"date\":\"1946-06-01\"},{\"title\":\"Pit and Quarry 1957-02: Vol 49 Iss 8\",\"date\":\"1957-02-01\"},{\"title\":\"Pit and Quarry 1950-04: Vol 42 Iss 10\",\"date\":\"1950-04-01\"},{\"title\":\"Pit & Quarry 1921-09: Vol 5 Iss 12\",\"date\":\"1921-09-01\"},{\"title\":\"Pit & Quarry 1924-04: Vol 8 Iss 7\",\"date\":\"1924-04-01\"},{\"title\":\"Pit and Quarry 1937-11: Vol 30 Iss 5\",\"date\":\"1937-11-01\"},{\"title\":\"Pit & Quarry 1945-02: Vol 37 Iss 8\",\"date\":\"1945-02-01\"},{\"title\":\"Pit & Quarry 1920-05: Vol 4 Iss 8\",\"date\":\"1920-05-01\"},{\"title\":\"Pit & Quarry 1921-04: Vol 5 Iss 7\",\"date\":\"1921-04-01\"},{\"title\":\"Pit & Quarry 1921-11: Vol 6 Iss 2\",\"date\":\"1921-11-01\"},{\"title\":\"Pit & Quarry 1932-05-18: Vol 24 Iss 4\",\"date\":\"1932-05-18\"},{\"title\":\"Pit and Quarry 1937-09: Vol 30 Iss 3\",\"date\":\"1937-09-01\"},{\"title\":\"Pit & Quarry 1948-06: Vol 40 Iss 12\",\"date\":\"1948-06-01\"},{\"title\":\"Pit and Quarry 1952-01: Vol 44 Iss 7\",\"date\":\"1952-01-01\"},{\"title\":\"Pit and Quarry 1953-03: Vol 45 Iss 9\",\"date\":\"1953-03-01\"},{\"title\":\"Pit and Quarry 1955-04: Vol 47 Iss 10\",\"date\":\"1955-04-01\"},{\"title\":\"Pit and Quarry 1955-09: Vol 48 Iss 3\",\"date\":\"1955-09-01\"},{\"title\":\"Pit and Quarry 1956-02: Vol 48 Iss 8\",\"date\":\"1956-02-01\"},{\"title\":\"Pit & Quarry 1961-06: Vol 53 Iss 12\",\"date\":\"1961-06-01\"},{\"title\":\"Pit & Quarry 1925-07-01: Vol 10 Iss 7\",\"date\":\"1925-07-01\"},{\"title\":\"Pit & Quarry 1927-04-27: Vol 14 Iss 2\",\"date\":\"1927-04-27\"},{\"title\":\"Pit & Quarry 1941-05: Vol 33 Iss 11\",\"date\":\"1941-05-01\"},{\"title\":\"Pit & Quarry 1944-09: Vol 37 Iss 3\",\"date\":\"1944-09-01\"},{\"title\":\"Pit & Quarry 1945-06: Vol 37 Iss 12\",\"date\":\"1945-06-01\"},{\"title\":\"Pit & Quarry 1945-07: Vol 38 Iss 1\",\"date\":\"1945-07-01\"},{\"title\":\"Pit & Quarry 1928-02-29: Vol 15 Iss 11\",\"date\":\"1928-02-29\"},{\"title\":\"Pit and Quarry 1954-03: Vol 46 Iss 9\",\"date\":\"1954-03-01\"},{\"title\":\"Pit and Quarry 1947-12: Vol 40 Iss 6\",\"date\":\"1947-12-01\"},{\"title\":\"Pit & Quarry 1921-12: Vol 6 Iss 3\",\"date\":\"1921-12-01\"},{\"title\":\"Pit & Quarry 1927-12-07: Vol 15 Iss 5\",\"date\":\"1927-12-07\"},{\"title\":\"Pit & Quarry 1929-10-09: Vol 19 Iss 1\",\"date\":\"1929-10-09\"},{\"title\":\"Pit & Quarry 1930-10-22: Vol 21 Iss 2\",\"date\":\"1930-10-22\"},{\"title\":\"Pit & Quarry 1931-07-01: Vol 22 Iss 7\",\"date\":\"1931-07-01\"},{\"title\":\"Pit & Quarry 1925-11-15: Vol 11 Iss 4\",\"date\":\"1925-11-15\"},{\"title\":\"Pit & Quarry 1932-10-05: Vol 25 Iss 1\",\"date\":\"1932-10-05\"},{\"title\":\"Pit & Quarry 1932-10-19: Vol 25 Iss 2\",\"date\":\"1932-10-19\"},{\"title\":\"Pit & Quarry 1938-05: Vol 30 Iss 11\",\"date\":\"1938-05-01\"},{\"title\":\"Pit and Quarry 1939-04: Vol 31 Iss 10\",\"date\":\"1939-04-01\"},{\"title\":\"Pit and Quarry 1940-01: Vol 32 Iss 7\",\"date\":\"1940-01-01\"},{\"title\":\"Pit and Quarry 1942-12: Vol 35 Iss 6\",\"date\":\"1942-12-01\"},{\"title\":\"Pit and Quarry 1943-07: Vol 36 Iss 1\",\"date\":\"1943-07-01\"},{\"title\":\"Pit & Quarry 1945-03: Vol 37 Iss 9\",\"date\":\"1945-03-01\"},{\"title\":\"Pit and Quarry 1948-02: Vol 40 Iss 8\",\"date\":\"1948-02-01\"},{\"title\":\"Pit & Quarry 1949-04: Vol 41 Iss 10\",\"date\":\"1949-04-01\"},{\"title\":\"Pit and Quarry 1952-04: Vol 44 Iss 10\",\"date\":\"1952-04-01\"},{\"title\":\"Pit and Quarry 1957-01: Vol 49 Iss 7\",\"date\":\"1957-01-01\"},{\"title\":\"Pit & Quarry 1960: Vol 53 Index\",\"date\":\"1960-01-01\"},{\"title\":\"Pit & Quarry 1961-09: Vol 54 Iss 3\",\"date\":\"1961-09-01\"},{\"title\":\"Pit and Quarry 1938-09: Vol 31 Iss 3\",\"date\":\"1938-09-01\"},{\"title\":\"Pit & Quarry 1917-11: Vol 2 Iss 1\",\"date\":\"1917-11-01\"},{\"title\":\"Pit & Quarry 1918-03: Vol 2 Iss 4\",\"date\":\"1918-03-01\"},{\"title\":\"Pit & Quarry 1919-06: Vol 3 Iss 9\",\"date\":\"1919-06-01\"},{\"title\":\"Pit & Quarry 1921-07: Vol 5 Iss 10\",\"date\":\"1921-07-01\"},{\"title\":\"Pit & Quarry 1922-02: Vol 6 Iss 5\",\"date\":\"1922-02-01\"},{\"title\":\"Pit & Quarry 1923-08: Vol 7 Iss 11\",\"date\":\"1923-08-01\"},{\"title\":\"Pit & Quarry 1924-07: Vol 8 Iss 10\",\"date\":\"1924-07-01\"},{\"title\":\"Pit & Quarry 1925-08-01: Vol 10 Iss 9\",\"date\":\"1925-08-01\"},{\"title\":\"Pit & Quarry 1930-12-31: Vol 21 Iss 7\",\"date\":\"1930-12-31\"},{\"title\":\"Pit & Quarry 1931-02-11: Vol 21 Iss 10\",\"date\":\"1931-02-11\"},{\"title\":\"Pit & Quarry 1931-12-16: Vol 23 Iss 6\",\"date\":\"1931-12-16\"},{\"title\":\"Pit & Quarry 1931 - 1932: Vol 23 Index\",\"date\":\"1931-01-01\"},{\"title\":\"Pit & Quarry 1928-11-21: Vol 17 Iss 4\",\"date\":\"1928-11-21\"},{\"title\":\"Pit & Quarry 1929-01-02: Vol 17 Iss 7\",\"date\":\"1929-01-02\"},{\"title\":\"Pit & Quarry 1929-01-30: Vol 17 Iss 9\",\"date\":\"1929-01-30\"},{\"title\":\"Pit & Quarry 1929-05-08: Vol 18 Iss 3\",\"date\":\"1929-05-08\"},{\"title\":\"Pit and Quarry 1938-11: Vol 31 Iss 5\",\"date\":\"1938-11-01\"},{\"title\":\"Pit & Quarry 1926-08-04: Vol 12 Iss 9\",\"date\":\"1926-08-04\"},{\"title\":\"Pit and Quarry 1947-01: Vol 39 Iss 7\",\"date\":\"1947-01-01\"},{\"title\":\"Pit & Quarry 1944-05: Vol 36 Iss 11\",\"date\":\"1944-05-01\"},{\"title\":\"Pit and Quarry 1945-08: Vol 38 Iss 2\",\"date\":\"1945-08-01\"},{\"title\":\"Pit and Quarry 1945-10: Vol 38 Iss 4\",\"date\":\"1945-10-01\"},{\"title\":\"Pit and Quarry 1945-12: Vol 38 Iss 6\",\"date\":\"1945-12-01\"},{\"title\":\"Pit and Quarry 1942-08: Vol 35 Iss 2\",\"date\":\"1942-08-01\"},{\"title\":\"Pit and Quarry 1952-05: Vol 44 Iss 11\",\"date\":\"1952-05-01\"},{\"title\":\"Pit and Quarry 1958-03: Vol 50 Iss 9\",\"date\":\"1958-03-01\"},{\"title\":\"Pit and Quarry 1948-04: Vol 40 Iss 10\",\"date\":\"1948-04-01\"},{\"title\":\"Pit & Quarry 1961-08: Vol 54 Iss 2\",\"date\":\"1961-08-01\"},{\"title\":\"Pit & Quarry 1919-12: Vol 4 Iss 3\",\"date\":\"1919-12-01\"},{\"title\":\"Pit & Quarry 1928-01-04: Vol 15 Iss 7\",\"date\":\"1928-01-04\"},{\"title\":\"Pit & Quarry 1931: Vol 22 Index\",\"date\":\"1931-01-01\"},{\"title\":\"Pit & Quarry 1926-06-01: Vol 12 Iss 5\",\"date\":\"1926-06-01\"},{\"title\":\"Pit & Quarry 1938-01: Vol 30 Iss 7\",\"date\":\"1938-01-01\"},{\"title\":\"Pit and Quarry 1939-01: Vol 31 Iss 7\",\"date\":\"1939-01-01\"},{\"title\":\"Pit and Quarry 1940-02: Vol 32 Iss 8\",\"date\":\"1940-02-01\"},{\"title\":\"Pit & Quarry 1943-12: Vol 36 Iss 6\",\"date\":\"1943-12-01\"},{\"title\":\"Pit and Quarry 1948-03: Vol 40 Iss 9\",\"date\":\"1948-03-01\"},{\"title\":\"Pit and Quarry July 1952-June 1953: Vol 45 Index\",\"date\":\"1952-07-01\"},{\"title\":\"Pit & Quarry 1970 - 1971: Vol 63 Index\",\"date\":\"1970-01-01\"},{\"title\":\"Pit and Quarry 1943-05: Vol 35 Iss 11\",\"date\":\"1943-05-01\"},{\"title\":\"Pit and Quarry 1943-11: Vol 36 Iss 5\",\"date\":\"1943-11-01\"},{\"title\":\"Pit & Quarry 1926-10-27: Vol 13 Iss 2\",\"date\":\"1926-10-27\"},{\"title\":\"Pit & Quarry 1928-01-18: Vol 15 Iss 8\",\"date\":\"1928-01-18\"},{\"title\":\"Pit & Quarry 1946-06: Vol 38 Iss 12\",\"date\":\"1946-06-01\"},{\"title\":\"Pit and Quarry 1947-07: Vol 40 Iss 1\",\"date\":\"1947-07-01\"},{\"title\":\"Pit and Quarry 1947-11: Vol 40 Iss 5\",\"date\":\"1947-11-01\"},{\"title\":\"Pit & Quarry 1948-01: Vol 40 Iss 7\",\"date\":\"1948-01-01\"},{\"title\":\"Pit & Quarry 1944-11: Vol 37 Iss 5\",\"date\":\"1944-11-01\"},{\"title\":\"Pit and Quarry 1951-01: Vol 43 Iss 7\",\"date\":\"1951-01-01\"},{\"title\":\"Pit and Quarry 1948-11: Vol 41 Iss 5\",\"date\":\"1948-11-01\"},{\"title\":\"Pit & Quarry 1950-03: Vol 42 Iss 9\",\"date\":\"1950-03-01\"},{\"title\":\"Pit & Quarry 1924-12-01: Vol 9 Iss 5\",\"date\":\"1924-12-01\"},{\"title\":\"Pit & Quarry 1928-05-23: Vol 16 Iss 4\",\"date\":\"1928-05-23\"},{\"title\":\"Pit & Quarry 1929-11-06: Vol 19 Iss 3\",\"date\":\"1929-11-06\"},{\"title\":\"Pit & Quarry 1932-09-07: Vol 24 Iss 12\",\"date\":\"1932-09-07\"},{\"title\":\"Pit & Quarry 1937-08: Vol 30 Iss 2\",\"date\":\"1937-08-01\"},{\"title\":\"Pit and Quarry 1940-09: Vol 33 Iss 3\",\"date\":\"1940-09-01\"},{\"title\":\"Pit & Quarry 1941-04: Vol 33 Iss 10\",\"date\":\"1941-04-01\"},{\"title\":\"Pit & Quarry 1941-11: Vol 34 Iss 5\",\"date\":\"1941-11-01\"},{\"title\":\"Pit and Quarry 1943-02: Vol 35 Iss 8\",\"date\":\"1943-02-01\"},{\"title\":\"Pit & Quarry 1918-09: Vol 2 Iss 10\",\"date\":\"1918-09-01\"},{\"title\":\"Pit & Quarry 1918-10: Vol 3 Iss 1\",\"date\":\"1918-10-01\"},{\"title\":\"Pit & Quarry 1926-04-01: Vol 12 Iss 1\",\"date\":\"1926-04-01\"},{\"title\":\"Pit & Quarry 1930-03-12: Vol 19 Iss 12\",\"date\":\"1930-03-12\"},{\"title\":\"Pit & Quarry 1930-03-26: Vol 19 Iss 13\",\"date\":\"1930-03-26\"},{\"title\":\"Pit & Quarry 1930-04-09: Vol 20 Iss 1\",\"date\":\"1930-04-09\"},{\"title\":\"Pit & Quarry 1937-02: Vol 29 Iss 8\",\"date\":\"1937-02-01\"},{\"title\":\"Pit and Quarry 1938-10: Vol 31 Iss 4\",\"date\":\"1938-10-01\"},{\"title\":\"Pit & Quarry 1926-10-13: Vol 13 Iss 1\",\"date\":\"1926-10-13\"},{\"title\":\"Pit and Quarry 1941-01: Vol 33 Iss 7\",\"date\":\"1941-01-01\"},{\"title\":\"Pit & Quarry 1944-12: Vol 37 Iss 6\",\"date\":\"1944-12-01\"},{\"title\":\"Pit and Quarry 1941-12: Vol 34 Iss 6\",\"date\":\"1941-12-01\"},{\"title\":\"Pit & Quarry 1941-12: Vol 34 Iss 6\",\"date\":\"1941-12-01\"},{\"title\":\"Pit and Quarry 1951-09: Vol 44 Iss 3\",\"date\":\"1951-09-01\"},{\"title\":\"Pit and Quarry 1958-10: Vol 51 Iss 4\",\"date\":\"1958-10-01\"},{\"title\":\"Pit and Quarry 1958-12: Vol 51 Iss 6\",\"date\":\"1958-12-01\"},{\"title\":\"Pit & Quarry 1948-04: Vol 40 Iss 10\",\"date\":\"1948-04-01\"},{\"title\":\"Pit & Quarry 1960-09: Vol 53 Iss 3\",\"date\":\"1960-09-01\"},{\"title\":\"Pit & Quarry 1960-09: Vol 53 Iss 3\",\"date\":\"1960-09-01\"},{\"title\":\"Pit & Quarry 1961-02: Vol 53 Iss 8\",\"date\":\"1961-02-01\"},{\"title\":\"Pit & Quarry 1924-01: Vol 8 Iss 4\",\"date\":\"1924-01-01\"},{\"title\":\"Pit & Quarry 1927-04-13: Vol 14 Iss 1\",\"date\":\"1927-04-13\"},{\"title\":\"Pit and Quarry 1952-08: Vol 45 Iss 2\",\"date\":\"1952-08-01\"},{\"title\":\"Pit and Quarry 1953-06: Vol 45 Iss 12\",\"date\":\"1953-06-01\"},{\"title\":\"Pit & Quarry 1929-07-17: Vol 18 Iss 8\",\"date\":\"1929-07-17\"},{\"title\":\"Pit & Quarry 1930-02-12: Vol 19 Iss 10\",\"date\":\"1930-02-12\"},{\"title\":\"Pit & Quarry 1930-09-24: Vol 20 Iss 13\",\"date\":\"1930-09-24\"},{\"title\":\"Pit & Quarry 1941-01: Vol 33 Iss 7\",\"date\":\"1941-01-01\"},{\"title\":\"Pit & Quarry 1942-03: Vol 34 Iss 9\",\"date\":\"1942-03-01\"},{\"title\":\"Pit and Quarry 1956-09: Vol 49 Iss 3\",\"date\":\"1956-09-01\"},{\"title\":\"Pit and Quarry 1957-05: Vol 49 Iss 11\",\"date\":\"1957-05-01\"},{\"title\":\"Pit & Quarry 1961-11: Vol 54 Iss 5\",\"date\":\"1961-11-01\"},{\"title\":\"Pit & Quarry 1961 - 1962: Vol 54 Index\",\"date\":\"1961-01-01\"},{\"title\":\"Pit & Quarry 1928-04-11: Vol 16 Iss 1\",\"date\":\"1928-04-11\"},{\"title\":\"Pit & Quarry 1930-01-29: Vol 19 Iss 9\",\"date\":\"1930-01-29\"},{\"title\":\"Pit & Quarry 1930-05-07: Vol 20 Iss 3\",\"date\":\"1930-05-07\"},{\"title\":\"Pit & Quarry 1930-12-03: Vol 21 Iss 5\",\"date\":\"1930-12-03\"},{\"title\":\"Pit and Quarry 1939-05: Vol 31 Iss 11\",\"date\":\"1939-05-01\"},{\"title\":\"Pit & Quarry 1939-07: Vol 32 Iss 1\",\"date\":\"1939-07-01\"},{\"title\":\"Pit & Quarry 1922-03: Vol 6 Iss 6\",\"date\":\"1922-03-01\"},{\"title\":\"Pit & Quarry 1925-05-15: Vol 10 Iss 4\",\"date\":\"1925-05-15\"},{\"title\":\"Pit & Quarry 1925-06-15: Vol 10 Iss 6\",\"date\":\"1925-06-15\"},{\"title\":\"Pit & Quarry 1925-07-15: Vol 10 Iss 8\",\"date\":\"1925-07-15\"},{\"title\":\"Pit & Quarry 1925-12-15: Vol 11 Iss 6\",\"date\":\"1925-12-15\"},{\"title\":\"Pit & Quarry 1926-05-01: Vol 12 Iss 3\",\"date\":\"1926-05-01\"},{\"title\":\"Pit & Quarry 1926-07-07: Vol 12 Iss 7\",\"date\":\"1926-07-07\"},{\"title\":\"Pit & Quarry 1926-07-21: Vol 12 Iss 8\",\"date\":\"1926-07-21\"},{\"title\":\"Pit and Quarry 1943-06: Vol 35 Iss 12\",\"date\":\"1943-06-01\"},{\"title\":\"Pit and Quarry 1945-03: Vol 37 Iss 9\",\"date\":\"1945-03-01\"},{\"title\":\"Pit & Quarry 1945-11: Vol 38 Iss 5\",\"date\":\"1945-11-01\"},{\"title\":\"Pit & Quarry 1945-12: Vol 38 Iss 6\",\"date\":\"1945-12-01\"},{\"title\":\"Pit & Quarry 1947-10: Vol 40 Iss 4\",\"date\":\"1947-10-01\"},{\"title\":\"Pit and Quarry 1955-06: Vol 47 Iss 12\",\"date\":\"1955-06-01\"},{\"title\":\"Pit and Quarry 1955-10: Vol 48 Iss 4\",\"date\":\"1955-10-01\"},{\"title\":\"Pit and Quarry 1960-03: Vol 52 Iss 9\",\"date\":\"1960-03-01\"},{\"title\":\"Pit & Quarry 1961-05: Vol 53 Iss 11\",\"date\":\"1961-05-01\"},{\"title\":\"Pit & Quarry 1928-08-01: Vol 16 Iss 9\",\"date\":\"1928-08-01\"},{\"title\":\"Pit & Quarry 1928-09-12: Vol 16 Iss 12\",\"date\":\"1928-09-12\"},{\"title\":\"Pit & Quarry 1928: Vol 16 Index\",\"date\":\"1928-01-01\"},{\"title\":\"Pit & Quarry 1929-04-10: Vol 18 Iss 1\",\"date\":\"1929-04-10\"},{\"title\":\"Pit and Quarry 1956-07: Vol 49 Iss 1\",\"date\":\"1956-07-01\"},{\"title\":\"Pit and Quarry 1958-01: Vol 50 Iss 7\",\"date\":\"1958-01-01\"},{\"title\":\"Pit & Quarry 1961-04: Vol 53 Iss 10\",\"date\":\"1961-04-01\"},{\"title\":\"Pit & Quarry 1923-07: Vol 7 Iss 10\",\"date\":\"1923-07-01\"},{\"title\":\"Pit & Quarry 1926-11-10: Vol 13 Iss 3\",\"date\":\"1926-11-10\"},{\"title\":\"Pit & Quarry 1936-09: Vol 29 Iss 3\",\"date\":\"1936-09-01\"},{\"title\":\"Pit and Quarry 1941-06: Vol 33 Iss 12\",\"date\":\"1941-06-01\"},{\"title\":\"Pit and Quarry 1941-08: Vol 34 Iss 2\",\"date\":\"1941-08-01\"},{\"title\":\"Pit and Quarry 1942-02: Vol 34 Iss 8\",\"date\":\"1942-02-01\"},{\"title\":\"Pit and Quarry 1944-01: Vol 36 Iss 7\",\"date\":\"1944-01-01\"},{\"title\":\"Pit and Quarry 1944-09: Vol 37 Iss 3\",\"date\":\"1944-09-01\"},{\"title\":\"Pit & Quarry 1928-06-06: Vol 16 Iss 5\",\"date\":\"1928-06-06\"},{\"title\":\"Pit & Quarry 1931-11-04: Vol 23 Iss 3\",\"date\":\"1931-11-04\"},{\"title\":\"Pit & Quarry 1931-12-02: Vol 23 Iss 5\",\"date\":\"1931-12-02\"},{\"title\":\"Pit & Quarry 1938-03: Vol 30 Iss 9\",\"date\":\"1938-03-01\"},{\"title\":\"Pit & Quarry 1939-03: Vol 31 Iss 9\",\"date\":\"1939-03-01\"},{\"title\":\"Pit and Quarry 1943-04: Vol 35 Iss 10\",\"date\":\"1943-04-01\"},{\"title\":\"Pit & Quarry 1943-04: Vol 35 Iss 10\",\"date\":\"1943-04-01\"},{\"title\":\"Pit and Quarry 1943-12: Vol 36 Iss 6\",\"date\":\"1943-12-01\"},{\"title\":\"Pit & Quarry 1961-04: Vol 53 Iss 10\",\"date\":\"1961-04-01\"},{\"title\":\"Pit & Quarry 1925-01-15: Vol 9 Iss 8\",\"date\":\"1925-01-15\"},{\"title\":\"Pit & Quarry 1926-05-15: Vol 12 Iss 4\",\"date\":\"1926-05-15\"},{\"title\":\"Pit & Quarry 1926-12-22: Vol 13 Iss 6\",\"date\":\"1926-12-22\"},{\"title\":\"Pit and Quarry 1948-01: Vol 40 Iss 7\",\"date\":\"1948-01-01\"},{\"title\":\"Pit & Quarry 1949-12: Vol 42 Iss 6\",\"date\":\"1949-12-01\"},{\"title\":\"Pit & Quarry 1923-05: Vol 7 Iss 8\",\"date\":\"1923-05-01\"},{\"title\":\"Pit & Quarry 1929-06-05: Vol 18 Iss 5\",\"date\":\"1929-06-05\"},{\"title\":\"Pit & Quarry 1919-09: Vol 3 Iss 12\",\"date\":\"1919-09-01\"},{\"title\":\"Pit & Quarry 1928-07-04: Vol 16 Iss 7\",\"date\":\"1928-07-04\"},{\"title\":\"Pit & Quarry 1961-02: Vol 53 Iss 8\",\"date\":\"1961-02-01\"},{\"title\":\"Pit & Quarry 1918-02: Vol 2 Iss 3\",\"date\":\"1918-02-01\"},{\"title\":\"Pit & Quarry 1921-03: Vol 5 Iss 6\",\"date\":\"1921-03-01\"},{\"title\":\"Pit & Quarry 1922-09: Vol 6 Iss 12\",\"date\":\"1922-09-01\"},{\"title\":\"Pit & Quarry 1923-11: Vol 8 Iss 2\",\"date\":\"1923-11-01\"},{\"title\":\"Pit & Quarry 1932-04-06: Vol 24 Iss 1\",\"date\":\"1932-04-06\"},{\"title\":\"Pit & Quarry 1934-01: Vol 26 Iss 7\",\"date\":\"1934-01-01\"},{\"title\":\"Pit & Quarry 1939-05: Vol 31 Iss 11\",\"date\":\"1939-05-01\"},{\"title\":\"Pit and Quarry 1947-05: Vol 39 Iss 11\",\"date\":\"1947-05-01\"},{\"title\":\"Pit and Quarry 1960-04: Vol 52 Iss 10\",\"date\":\"1960-04-01\"},{\"title\":\"Pit & Quarry 1962 - 1963: Vol 55 Index\",\"date\":\"1962-01-01\"},{\"title\":\"Pit & Quarry 1963 - 1964: Vol 56 Index\",\"date\":\"1963-01-01\"},{\"title\":\"Pit and Quarry 1970 - 1971: Vol 63 Index\",\"date\":\"1970-01-01\"},{\"title\":\"Pit & Quarry 1930-05-21: Vol 20 Iss 4\",\"date\":\"1930-05-21\"},{\"title\":\"Pit & Quarry 1930-08-13: Vol 20 Iss 10\",\"date\":\"1930-08-13\"},{\"title\":\"Pit & Quarry 1926-02-01: Vol 11 Iss 9\",\"date\":\"1926-02-01\"},{\"title\":\"Pit and Quarry 1953-07: Vol 46 Iss 1\",\"date\":\"1953-07-01\"},{\"title\":\"Pit and Quarry 1955-03: Vol 47 Iss 9\",\"date\":\"1955-03-01\"},{\"title\":\"Pit and Quarry 1955-12: Vol 48 Iss 6\",\"date\":\"1955-12-01\"},{\"title\":\"Pit & Quarry 1923-09: Vol 7 Iss 12\",\"date\":\"1923-09-01\"},{\"title\":\"Pit & Quarry 1939-10: Vol 32 Iss 4\",\"date\":\"1939-10-01\"},{\"title\":\"Pit and Quarry 1950-02: Vol 42 Iss 8\",\"date\":\"1950-02-01\"},{\"title\":\"Pit & Quarry 1920-07: Vol 4 Iss 10\",\"date\":\"1920-07-01\"},{\"title\":\"Pit & Quarry 1964 - 1965: Vol 57 Index\",\"date\":\"1964-01-01\"},{\"title\":\"Pit and Quarry 1942-05: Vol 34 Iss 11\",\"date\":\"1942-05-01\"},{\"title\":\"Pit & Quarry 1932-08-24: Vol 24 Iss 11\",\"date\":\"1932-08-24\"},{\"title\":\"Pit & Quarry 1936-03: Vol 28 Iss 9\",\"date\":\"1936-03-01\"},{\"title\":\"Pit and Quarry 1957-03: Vol 49 Iss 9\",\"date\":\"1957-03-01\"},{\"title\":\"Pit & Quarry 1926-01-01: Vol 11 Iss 7\",\"date\":\"1926-01-01\"},{\"title\":\"Pit & Quarry 1926-12-08: Vol 13 Iss 5\",\"date\":\"1926-12-08\"},{\"title\":\"Pit and Quarry 1947-10: Vol 40 Iss 4\",\"date\":\"1947-10-01\"},{\"title\":\"Pit and Quarry 1950-06: Vol 42 Iss 12\",\"date\":\"1950-06-01\"},{\"title\":\"Pit and Quarry July 1958-June 1959: Vol 51 Index\",\"date\":\"1958-07-01\"},{\"title\":\"Pit & Quarry 1932-09-21: Vol 24 Iss 13\",\"date\":\"1932-09-21\"},{\"title\":\"Pit & Quarry 1932-11: Vol 25 Iss 3\",\"date\":\"1932-11-01\"},{\"title\":\"Pit & Quarry 1933-05: Vol 25 Iss 9\",\"date\":\"1933-05-01\"},{\"title\":\"Pit and Quarry 1938-04: Vol 30 Iss 10\",\"date\":\"1938-04-01\"},{\"title\":\"Pit & Quarry 1938-10: Vol 31 Iss 4\",\"date\":\"1938-10-01\"},{\"title\":\"Pit and Quarry 1938-12: Vol 31 Iss 6\",\"date\":\"1938-12-01\"},{\"title\":\"Pit and Quarry 1939-12: Vol 32 Iss 6\",\"date\":\"1939-12-01\"},{\"title\":\"Pit and Quarry 1940-12: Vol 33 Iss 6\",\"date\":\"1940-12-01\"},{\"title\":\"Pit and Quarry 1944-04: Vol 36 Iss 10\",\"date\":\"1944-04-01\"},{\"title\":\"Pit and Quarry 1956-12: Vol 49 Iss 6\",\"date\":\"1956-12-01\"},{\"title\":\"Pit and Quarry 1959-02: Vol 51 Iss 8\",\"date\":\"1959-02-01\"},{\"title\":\"Pit & Quarry 1961-12: Vol 54 Iss 6\",\"date\":\"1961-12-01\"},{\"title\":\"Pit & Quarry 1973 - 1974: Vol 66 Index\",\"date\":\"1973-01-01\"},{\"title\":\"Pit and Quarry July 1955-June 1956: Vol 48 Index\",\"date\":\"1955-07-01\"},{\"title\":\"Pit & Quarry 1920-03: Vol 4 Iss 6\",\"date\":\"1920-03-01\"},{\"title\":\"Pit & Quarry 1929-06-19: Vol 18 Iss 6\",\"date\":\"1929-06-19\"},{\"title\":\"Pit & Quarry 1925-12-01: Vol 11 Iss 5\",\"date\":\"1925-12-01\"},{\"title\":\"Pit & Quarry 1926-03-01: Vol 11 Iss 11\",\"date\":\"1926-03-01\"},{\"title\":\"Pit & Quarry 1927-06-08: Vol 14 Iss 5\",\"date\":\"1927-06-08\"},{\"title\":\"Pit & Quarry 1927-08-03: Vol 14 Iss 9\",\"date\":\"1927-08-03\"},{\"title\":\"Pit and Quarry 1949-06: Vol 41 Iss 12\",\"date\":\"1949-06-01\"},{\"title\":\"Pit & Quarry 1950-02: Vol 42 Iss 8\",\"date\":\"1950-02-01\"},{\"title\":\"Pit & Quarry 1920-12: Vol 5 Iss 3\",\"date\":\"1920-12-01\"},{\"title\":\"Pit & Quarry 1924-10-15: Vol 9 Iss 2\",\"date\":\"1924-10-15\"},{\"title\":\"Pit & Quarry 1930-11-05: Vol 21 Iss 3\",\"date\":\"1930-11-05\"},{\"title\":\"Pit & Quarry 1927-02-16: Vol 13 Iss 10\",\"date\":\"1927-02-16\"},{\"title\":\"Pit & Quarry 1927-09-28: Vol 14 Iss 13\",\"date\":\"1927-09-28\"},{\"title\":\"Pit & Quarry 1946-08: Vol 39 Iss 2\",\"date\":\"1946-08-01\"},{\"title\":\"Pit & Quarry 1947-11: Vol 40 Iss 5\",\"date\":\"1947-11-01\"},{\"title\":\"Pit and Quarry 1942-07: Vol 35 Iss 1\",\"date\":\"1942-07-01\"},{\"title\":\"Pit and Quarry 1942-09: Vol 35 Iss 3\",\"date\":\"1942-09-01\"},{\"title\":\"Pit and Quarry 1943-01: Vol 35 Iss 7\",\"date\":\"1943-01-01\"},{\"title\":\"Pit & Quarry 1943-06: Vol 35 Iss 12\",\"date\":\"1943-06-01\"},{\"title\":\"Pit and Quarry 1958-02: Vol 50 Iss 8\",\"date\":\"1958-02-01\"},{\"title\":\"Pit & Quarry 1917-07: Vol 1 Iss 5\",\"date\":\"1917-07-01\"},{\"title\":\"Pit & Quarry 1935-04: Vol 27 Iss 10\",\"date\":\"1935-04-01\"},{\"title\":\"Pit & Quarry 1937-05: Vol 29 Iss 11\",\"date\":\"1937-05-01\"},{\"title\":\"Pit & Quarry 1937-09: Vol 30 Iss 3\",\"date\":\"1937-09-01\"},{\"title\":\"Pit and Quarry 1938-02: Vol 30 Iss 8\",\"date\":\"1938-02-01\"},{\"title\":\"Pit and Quarry 1938-03: Vol 30 Iss 9\",\"date\":\"1938-03-01\"},{\"title\":\"Pit & Quarry 1938-07: Vol 31 Iss 1\",\"date\":\"1938-07-01\"},{\"title\":\"Pit & Quarry 1939-08: Vol 32 Iss 2\",\"date\":\"1939-08-01\"},{\"title\":\"Pit & Quarry 1939-12: Vol 32 Iss 6\",\"date\":\"1939-12-01\"},{\"title\":\"Pit and Quarry 1940-10: Vol 33 Iss 4\",\"date\":\"1940-10-01\"},{\"title\":\"Pit & Quarry 1940-10: Vol 33 Iss 4\",\"date\":\"1940-10-01\"},{\"title\":\"Pit & Quarry 1944-01: Vol 36 Iss 7\",\"date\":\"1944-01-01\"},{\"title\":\"Pit & Quarry 1944-03: Vol 36 Iss 9\",\"date\":\"1944-03-01\"},{\"title\":\"Pit & Quarry 1944-07: Vol 37 Iss 1\",\"date\":\"1944-07-01\"},{\"title\":\"Pit and Quarry 1950-07: Vol 43 Iss 1\",\"date\":\"1950-07-01\"},{\"title\":\"Pit and Quarry 1950-09: Vol 43 Iss 3\",\"date\":\"1950-09-01\"},{\"title\":\"Pit and Quarry 1951-05: Vol 43 Iss 11\",\"date\":\"1951-05-01\"},{\"title\":\"Pit & Quarry 1948-12: Vol 41 Iss 6\",\"date\":\"1948-12-01\"},{\"title\":\"Pit & Quarry 1949-01: Vol 41 Iss 7\",\"date\":\"1949-01-01\"},{\"title\":\"Pit & Quarry 1949-02: Vol 41 Iss 8\",\"date\":\"1949-02-01\"},{\"title\":\"Pit & Quarry 1949-03: Vol 41 Iss 9\",\"date\":\"1949-03-01\"},{\"title\":\"Pit & Quarry 1949-08: Vol 42 Iss 2\",\"date\":\"1949-08-01\"},{\"title\":\"Pit and Quarry 1949-12: Vol 42 Iss 6\",\"date\":\"1949-12-01\"},{\"title\":\"Pit & Quarry 1965 - 1966: Vol 58 Index\",\"date\":\"1965-01-01\"},{\"title\":\"Pit and Quarry 1959-07: Vol 52 Iss 1\",\"date\":\"1959-07-01\"},{\"title\":\"Pit and Quarry 1959-11: Vol 52 Iss 5\",\"date\":\"1959-11-01\"},{\"title\":\"Pit & Quarry 1960-11: Vol 53 Iss 5\",\"date\":\"1960-11-01\"},{\"title\":\"Pit & Quarry 1961-01: Vol 53 Iss 7\",\"date\":\"1961-01-01\"},{\"title\":\"Pit & Quarry 1961: Vol 54 Index\",\"date\":\"1961-01-01\"},{\"title\":\"Pit & Quarry 1928-02-15: Vol 15 Iss 10\",\"date\":\"1928-02-15\"},{\"title\":\"Pit & Quarry 1928-05-09: Vol 16 Iss 3\",\"date\":\"1928-05-09\"},{\"title\":\"Pit & Quarry 1926-09-01: Vol 12 Iss 11\",\"date\":\"1926-09-01\"},{\"title\":\"Pit and Quarry 1939-06: Vol 31 Iss 12\",\"date\":\"1939-06-01\"},{\"title\":\"Pit & Quarry 1934-05: Vol 26 Iss 11\",\"date\":\"1934-05-01\"},{\"title\":\"Pit & Quarry 1920-02: Vol 4 Iss 5\",\"date\":\"1920-02-01\"},{\"title\":\"Pit & Quarry 1920-08: Vol 4 Iss 11\",\"date\":\"1920-08-01\"},{\"title\":\"Pit & Quarry 1928-04-25: Vol 16 Iss 2\",\"date\":\"1928-04-25\"},{\"title\":\"Pit & Quarry 1931-07-15: Vol 22 Iss 8\",\"date\":\"1931-07-15\"},{\"title\":\"Pit and Quarry 1953-08: Vol 46 Iss 2\",\"date\":\"1953-08-01\"},{\"title\":\"Pit and Quarry 1955-02: Vol 47 Iss 8\",\"date\":\"1955-02-01\"},{\"title\":\"Pit & Quarry 1924-05: Vol 8 Iss 8\",\"date\":\"1924-05-01\"},{\"title\":\"Pit & Quarry 1926-04-15: Vol 12 Iss 2\",\"date\":\"1926-04-15\"},{\"title\":\"Pit & Quarry 1933-06: Vol 25 Iss 10\",\"date\":\"1933-06-01\"},{\"title\":\"Pit & Quarry 1934-08: Vol 27 Iss 2\",\"date\":\"1934-08-01\"},{\"title\":\"Pit and Quarry 1938-06: Vol 30 Iss 12\",\"date\":\"1938-06-01\"},{\"title\":\"Pit and Quarry 1944-12: Vol 37 Iss 6\",\"date\":\"1944-12-01\"},{\"title\":\"Pit & Quarry 1935-06: Vol 27 Iss 12\",\"date\":\"1935-06-01\"},{\"title\":\"Pit & Quarry 1928-09-26: Vol 16 Iss 13\",\"date\":\"1928-09-26\"},{\"title\":\"Pit and Quarry July 1957-June 1958: Vol 50 Index\",\"date\":\"1957-07-01\"},{\"title\":\"Pit & Quarry November 1917-September 1918: Vol 2 Table of Contents\",\"date\":\"1917-11-01\"},{\"title\":\"Pit & Quarry 1919-08: Vol 3 Iss 11\",\"date\":\"1919-08-01\"},{\"title\":\"Pit & Quarry 1961-05: Vol 53 Iss 11\",\"date\":\"1961-05-01\"},{\"title\":\"Pit & Quarry 1928-10-24: Vol 17 Iss 2\",\"date\":\"1928-10-24\"},{\"title\":\"Pit and Quarry 1958-05: Vol 50 Iss 11\",\"date\":\"1958-05-01\"},{\"title\":\"Pit & Quarry 1966 - 1967: Vol 59 Index\",\"date\":\"1966-01-01\"},{\"title\":\"Pit & Quarry 1930 - 1931: Vol 21 Index\",\"date\":\"1930-01-01\"},{\"title\":\"Pit and Quarry 1946-08: Vol 39 Iss 2\",\"date\":\"1946-08-01\"},{\"title\":\"Pit and Quarry 1948-09: Vol 41 Iss 3\",\"date\":\"1948-09-01\"},{\"title\":\"Pit and Quarry 1949-05: Vol 41 Iss 11\",\"date\":\"1949-05-01\"},{\"title\":\"Pit and Quarry 1950-01: Vol 42 Iss 7\",\"date\":\"1950-01-01\"},{\"title\":\"Pit & Quarry 1950-04: Vol 42 Iss 10\",\"date\":\"1950-04-01\"},{\"title\":\"Pit & Quarry 1924-08: Vol 8 Iss 11\",\"date\":\"1924-08-01\"},{\"title\":\"Pit & Quarry 1924-09: Vol 8 Iss 12\",\"date\":\"1924-09-01\"},{\"title\":\"Pit & Quarry 1924-12-15: Vol 9 Iss 6\",\"date\":\"1924-12-15\"},{\"title\":\"Pit & Quarry 1929-02-27: Vol 17 Iss 11\",\"date\":\"1929-02-27\"},{\"title\":\"Pit and Quarry 1939-09: Vol 32 Iss 3\",\"date\":\"1939-09-01\"},{\"title\":\"Pit and Quarry 1939-11: Vol 32 Iss 5\",\"date\":\"1939-11-01\"},{\"title\":\"Pit and Quarry 1940-04: Vol 32 Iss 10\",\"date\":\"1940-04-01\"},{\"title\":\"Pit & Quarry 1944-10: Vol 37 Iss 4\",\"date\":\"1944-10-01\"},{\"title\":\"Pit and Quarry 1945-04: Vol 37 Iss 10\",\"date\":\"1945-04-01\"},{\"title\":\"Pit and Quarry 1941-09: Vol 34 Iss 3\",\"date\":\"1941-09-01\"},{\"title\":\"Pit and Quarry 1943-03: Vol 35 Iss 9\",\"date\":\"1943-03-01\"},{\"title\":\"Pit and Quarry 1952-06: Vol 44 Iss 12\",\"date\":\"1952-06-01\"},{\"title\":\"Pit and Quarry 1954-05: Vol 46 Iss 11\",\"date\":\"1954-05-01\"},{\"title\":\"Pit and Quarry 1943-09: Vol 36 Iss 3\",\"date\":\"1943-09-01\"},{\"title\":\"Pit & Quarry 1928-07-18: Vol 16 Iss 8\",\"date\":\"1928-07-18\"},{\"title\":\"Pit & Quarry 1919: Vol 1 Index\",\"date\":\"1919-01-01\"},{\"title\":\"Pit & Quarry 1934-06: Vol 26 Iss 12\",\"date\":\"1934-06-01\"},{\"title\":\"Pit & Quarry 1928-12-19: Vol 17 Iss 6\",\"date\":\"1928-12-19\"},{\"title\":\"Pit & Quarry 1930-01-15: Vol 19 Iss 8\",\"date\":\"1930-01-15\"},{\"title\":\"Pit & Quarry 1946-12: Vol 39 Iss 6\",\"date\":\"1946-12-01\"},{\"title\":\"Pit & Quarry 1947-02: Vol 39 Iss 8\",\"date\":\"1947-02-01\"},{\"title\":\"Pit and Quarry 1947-06: Vol 39 Iss 12\",\"date\":\"1947-06-01\"},{\"title\":\"Pit and Quarry 1947-09: Vol 40 Iss 3\",\"date\":\"1947-09-01\"},{\"title\":\"Pit and Quarry 1951-02: Vol 43 Iss 8\",\"date\":\"1951-02-01\"},{\"title\":\"Pit & Quarry 1948-03: Vol 40 Iss 9\",\"date\":\"1948-03-01\"},{\"title\":\"Pit & Quarry 1930: Vol 20 Index\",\"date\":\"1930-01-01\"},{\"title\":\"Pit & Quarry 1931-03-25: Vol 21 Iss 13\",\"date\":\"1931-03-25\"},{\"title\":\"Pit & Quarry 1931-10-21: Vol 23 Iss 2\",\"date\":\"1931-10-21\"},{\"title\":\"Pit and Quarry 1937-02: Vol 29 Iss 8\",\"date\":\"1937-02-01\"},{\"title\":\"Pit & Quarry 1940-07: Vol 33 Iss 1\",\"date\":\"1940-07-01\"},{\"title\":\"Pit & Quarry 1940-11: Vol 33 Iss 5\",\"date\":\"1940-11-01\"},{\"title\":\"Pit and Quarry 1943-10: Vol 36 Iss 4\",\"date\":\"1943-10-01\"},{\"title\":\"Pit & Quarry 1944-06: Vol 36 Iss 12\",\"date\":\"1944-06-01\"},{\"title\":\"Pit and Quarry 1944-08: Vol 37 Iss 2\",\"date\":\"1944-08-01\"},{\"title\":\"Pit and Quarry 1945-02: Vol 37 Iss 8\",\"date\":\"1945-02-01\"},{\"title\":\"Pit & Quarry 1941-09: Vol 34 Iss 3\",\"date\":\"1941-09-01\"},{\"title\":\"Pit and Quarry 1942-03: Vol 34 Iss 9\",\"date\":\"1942-03-01\"},{\"title\":\"Pit & Quarry 1942-06: Vol 34 Iss 12\",\"date\":\"1942-06-01\"},{\"title\":\"Pit & Quarry 1961-07: Vol 54 Iss 1\",\"date\":\"1961-07-01\"},{\"title\":\"Pit and Quarry 1942-11: Vol 35 Iss 5\",\"date\":\"1942-11-01\"},{\"title\":\"Pit and Quarry 1942-10: Vol 35 Iss 4\",\"date\":\"1942-10-01\"},{\"title\":\"Pit and Quarry 1952-07: Vol 45 Iss 1\",\"date\":\"1952-07-01\"},{\"title\":\"Pit & Quarry 1921-06: Vol 5 Iss 9\",\"date\":\"1921-06-01\"},{\"title\":\"Pit and Quarry 1955-07: Vol 48 Iss 1\",\"date\":\"1955-07-01\"},{\"title\":\"Pit and Quarry 1955-08: Vol 48 Iss 2\",\"date\":\"1955-08-01\"},{\"title\":\"Pit & Quarry 1926: Vol 12 Index\",\"date\":\"1926-01-01\"},{\"title\":\"Pit & Quarry 1927-01-05: Vol 13 Iss 7\",\"date\":\"1927-01-05\"},{\"title\":\"Pit & Quarry 1960-07: Vol 53 Iss 1\",\"date\":\"1960-07-01\"},{\"title\":\"Pit & Quarry 1927-10-12: Vol 15 Iss 1\",\"date\":\"1927-10-12\"},{\"title\":\"Pit & Quarry 1929-08-14: Vol 18 Iss 10\",\"date\":\"1929-08-14\"},{\"title\":\"Pit & Quarry 1929-08-28: Vol 18 Iss 11\",\"date\":\"1929-08-28\"},{\"title\":\"Pit & Quarry 1930-09-10: Vol 20 Iss 12\",\"date\":\"1930-09-10\"},{\"title\":\"Pit & Quarry 1932-06-15: Vol 24 Iss 6\",\"date\":\"1932-06-15\"},{\"title\":\"Pit and Quarry 1937-04: Vol 29 Iss 10\",\"date\":\"1937-04-01\"},{\"title\":\"Pit & Quarry 1943-01: Vol 35 Iss 7\",\"date\":\"1943-01-01\"},{\"title\":\"Pit & Quarry 1929 - 1930: Vol 19 Index\",\"date\":\"1929-01-01\"},{\"title\":\"Pit & Quarry 1930-07-30: Vol 20 Iss 9\",\"date\":\"1930-07-30\"},{\"title\":\"Pit & Quarry 1935-10: Vol 28 Iss 4\",\"date\":\"1935-10-01\"},{\"title\":\"Pit & Quarry 1939-11: Vol 32 Iss 5\",\"date\":\"1939-11-01\"},{\"title\":\"Pit & Quarry 1967: Vol 60 Index\",\"date\":\"1967-01-01\"},{\"title\":\"Pit & Quarry 1919-11: Vol 4 Iss 2\",\"date\":\"1919-11-01\"},{\"title\":\"Pit & Quarry 1924-02: Vol 8 Iss 5\",\"date\":\"1924-02-01\"},{\"title\":\"Pit & Quarry 1924-03: Vol 8 Iss 6\",\"date\":\"1924-03-01\"},{\"title\":\"Pit & Quarry 1924-11-15: Vol 9 Iss 4\",\"date\":\"1924-11-15\"},{\"title\":\"Pit & Quarry 1926-03-15: Vol 11 Iss 12\",\"date\":\"1926-03-15\"},{\"title\":\"Pit and Quarry 1944-02: Vol 36 Iss 8\",\"date\":\"1944-02-01\"},{\"title\":\"Pit and Quarry 1949-09: Vol 42 Iss 3\",\"date\":\"1949-09-01\"},{\"title\":\"Pit & Quarry 1922-07: Vol 6 Iss 10\",\"date\":\"1922-07-01\"},{\"title\":\"Pit and Quarry 1938-01: Vol 30 Iss 7\",\"date\":\"1938-01-01\"},{\"title\":\"Pit & Quarry 1938-06: Vol 30 Iss 12\",\"date\":\"1938-06-01\"},{\"title\":\"Pit & Quarry 1926-08-18: Vol 12 Iss 10\",\"date\":\"1926-08-18\"},{\"title\":\"Pit & Quarry 1940-03: Vol 32 Iss 9\",\"date\":\"1940-03-01\"},{\"title\":\"Pit and Quarry 1940-05: Vol 32 Iss 11\",\"date\":\"1940-05-01\"},{\"title\":\"Pit & Quarry 1940-06: Vol 32 Iss 12\",\"date\":\"1940-06-01\"},{\"title\":\"Pit and Quarry 1946-09: Vol 39 Iss 3\",\"date\":\"1946-09-01\"},{\"title\":\"Pit & Quarry 1947-01: Vol 39 Iss 7\",\"date\":\"1947-01-01\"},{\"title\":\"Pit and Quarry 1947-02: Vol 39 Iss 8\",\"date\":\"1947-02-01\"},{\"title\":\"Pit & Quarry 1945-05: Vol 37 Iss 11\",\"date\":\"1945-05-01\"},{\"title\":\"Pit and Quarry 1956: Vol 49 Index\",\"date\":\"1956-01-01\"},{\"title\":\"Pit & Quarry 1916-10: Vol 1 Iss 1\",\"date\":\"1916-10-01\"},{\"title\":\"Pit & Quarry 1918-07: Vol 2 Iss 8\",\"date\":\"1918-07-01\"},{\"title\":\"Pit & Quarry 1919-05: Vol 3 Iss 8\",\"date\":\"1919-05-01\"},{\"title\":\"Pit & Quarry 1919-07: Vol 3 Iss 10\",\"date\":\"1919-07-01\"},{\"title\":\"Pit & Quarry 1921-05: Vol 5 Iss 8\",\"date\":\"1921-05-01\"},{\"title\":\"Pit & Quarry 1928-10-10: Vol 17 Iss 1\",\"date\":\"1928-10-10\"},{\"title\":\"Pit & Quarry 1931-04-08: Vol 22 Iss 1\",\"date\":\"1931-04-08\"},{\"title\":\"Pit & Quarry 1931-06-03: Vol 22 Iss 5\",\"date\":\"1931-06-03\"},{\"title\":\"Pit & Quarry 1932-06-01: Vol 24 Iss 5\",\"date\":\"1932-06-01\"},{\"title\":\"Pit and Quarry 1941-04: Vol 33 Iss 10\",\"date\":\"1941-04-01\"},{\"title\":\"Pit & Quarry 1941-08: Vol 34 Iss 2\",\"date\":\"1941-08-01\"},{\"title\":\"Pit & Quarry 1943-03: Vol 35 Iss 9\",\"date\":\"1943-03-01\"},{\"title\":\"Pit and Quarry 1950-11: Vol 43 Iss 5\",\"date\":\"1950-11-01\"},{\"title\":\"Pit and Quarry 1954-08: Vol 47 Iss 2\",\"date\":\"1954-08-01\"},{\"title\":\"Pit & Quarry 1948-09: Vol 41 Iss 3\",\"date\":\"1948-09-01\"},{\"title\":\"Pit & Quarry 1949-05: Vol 41 Iss 11\",\"date\":\"1949-05-01\"},{\"title\":\"Pit & Quarry 1949-09: Vol 42 Iss 3\",\"date\":\"1949-09-01\"},{\"title\":\"Pit & Quarry 1960-08: Vol 53 Iss 2\",\"date\":\"1960-08-01\"},{\"title\":\"Pit & Quarry 1928-03-14: Vol 15 Iss 12\",\"date\":\"1928-03-14\"},{\"title\":\"Pit & Quarry 1928-12-05: Vol 17 Iss 5\",\"date\":\"1928-12-05\"},{\"title\":\"Pit & Quarry 1931-01-28: Vol 21 Iss 9\",\"date\":\"1931-01-28\"},{\"title\":\"Pit and Quarry 1941-03: Vol 33 Iss 9\",\"date\":\"1941-03-01\"},{\"title\":\"Pit and Quarry 1944-10: Vol 37 Iss 4\",\"date\":\"1944-10-01\"},{\"title\":\"Pit and Quarry 1944-11: Vol 37 Iss 5\",\"date\":\"1944-11-01\"},{\"title\":\"Pit and Quarry 1946-05: Vol 38 Iss 11\",\"date\":\"1946-05-01\"},{\"title\":\"Pit & Quarry 1947-08: Vol 40 Iss 2\",\"date\":\"1947-08-01\"},{\"title\":\"Pit & Quarry 1949-11: Vol 42 Iss 5\",\"date\":\"1949-11-01\"},{\"title\":\"Pit and Quarry 1950-12: Vol 43 Iss 6\",\"date\":\"1950-12-01\"},{\"title\":\"Pit and Quarry 1951-08: Vol 44 Iss 2\",\"date\":\"1951-08-01\"},{\"title\":\"Pit and Quarry 1953-12: Vol 46 Iss 6\",\"date\":\"1953-12-01\"},{\"title\":\"Pit and Quarry 1955-05: Vol 47 Iss 11\",\"date\":\"1955-05-01\"},{\"title\":\"Pit and Quarry 1957-11: Vol 50 Iss 5\",\"date\":\"1957-11-01\"},{\"title\":\"Pit & Quarry 1961-11: Vol 54 Iss 5\",\"date\":\"1961-11-01\"},{\"title\":\"Pit & Quarry 1920-01: Vol 4 Iss 4\",\"date\":\"1920-01-01\"},{\"title\":\"Pit & Quarry 1922-04: Vol 6 Iss 7\",\"date\":\"1922-04-01\"},{\"title\":\"Pit & Quarry 1923-10: Vol 8 Iss 1\",\"date\":\"1923-10-01\"},{\"title\":\"Pit & Quarry 1925-02-01: Vol 9 Iss 9\",\"date\":\"1925-02-01\"},{\"title\":\"Pit & Quarry 1925-10-01: Vol 11 Iss 1\",\"date\":\"1925-10-01\"},{\"title\":\"Pit & Quarry 1927-02-02: Vol 13 Iss 9\",\"date\":\"1927-02-02\"},{\"title\":\"Pit & Quarry 1934-10: Vol 27 Iss 4\",\"date\":\"1934-10-01\"},{\"title\":\"Pit & Quarry 1935-05: Vol 27 Iss 11\",\"date\":\"1935-05-01\"},{\"title\":\"Pit and Quarry 1936-07: Vol 29 Iss 1\",\"date\":\"1936-07-01\"},{\"title\":\"Pit & Quarry 1937-04: Vol 29 Iss 10\",\"date\":\"1937-04-01\"},{\"title\":\"Pit & Quarry 1939-01: Vol 31 Iss 7\",\"date\":\"1939-01-01\"},{\"title\":\"Pit & Quarry 1939-09: Vol 32 Iss 3\",\"date\":\"1939-09-01\"},{\"title\":\"Pit & Quarry 1942-04: Vol 34 Iss 10\",\"date\":\"1942-04-01\"},{\"title\":\"Pit & Quarry 1918-04: Vol 2 Iss 5\",\"date\":\"1918-04-01\"},{\"title\":\"Pit & Quarry 1925-09-01: Vol 10 Iss 11\",\"date\":\"1925-09-01\"},{\"title\":\"Pit & Quarry 1946-07: Vol 39 Iss 1\",\"date\":\"1946-07-01\"},{\"title\":\"Pit & Quarry 1969: Vol 62 Index\",\"date\":\"1969-01-01\"},{\"title\":\"Pit & Quarry 1933-07: Vol 26 Iss 1\",\"date\":\"1933-07-01\"},{\"title\":\"Pit & Quarry 1928-08-15: Vol 16 Iss 10\",\"date\":\"1928-08-15\"},{\"title\":\"Pit & Quarry 1929-10-23: Vol 19 Iss 2\",\"date\":\"1929-10-23\"},{\"title\":\"Pit & Quarry 1924-06: Vol 8 Iss 9\",\"date\":\"1924-06-01\"},{\"title\":\"Pit & Quarry 1925-10-15: Vol 11 Iss 2\",\"date\":\"1925-10-15\"},{\"title\":\"Pit & Quarry 1927-01-19: Vol 13 Iss 8\",\"date\":\"1927-01-19\"},{\"title\":\"Pit & Quarry 1927-03-02: Vol 13 Iss 11\",\"date\":\"1927-03-02\"},{\"title\":\"Pit & Quarry 1927-05-11: Vol 14 Iss 3\",\"date\":\"1927-05-11\"},{\"title\":\"Pit & Quarry 1927-09-14: Vol 14 Iss 12\",\"date\":\"1927-09-14\"},{\"title\":\"Pit & Quarry 1935-07: Vol 28 Iss 1\",\"date\":\"1935-07-01\"},{\"title\":\"Pit & Quarry 1948-02: Vol 40 Iss 8\",\"date\":\"1948-02-01\"},{\"title\":\"Pit and Quarry 1948-10: Vol 41 Iss 4\",\"date\":\"1948-10-01\"},{\"title\":\"Pit and Quarry 1954-10: Vol 47 Iss 4\",\"date\":\"1954-10-01\"},{\"title\":\"Pit and Quarry 1955-01: Vol 47 Iss 7\",\"date\":\"1955-01-01\"},{\"title\":\"Pit & Quarry 1943-02: Vol 35 Iss 8\",\"date\":\"1943-02-01\"},{\"title\":\"Pit and Quarry 1956-10: Vol 49 Iss 4\",\"date\":\"1956-10-01\"},{\"title\":\"Pit and Quarry 1957-10: Vol 50 Iss 4\",\"date\":\"1957-10-01\"},{\"title\":\"Pit & Quarry 1961-03: Vol 53 Iss 9\",\"date\":\"1961-03-01\"},{\"title\":\"Pit & Quarry 1923-02: Vol 7 Iss 5\",\"date\":\"1923-02-01\"},{\"title\":\"Pit & Quarry 1929-07-31: Vol 18 Iss 9\",\"date\":\"1929-07-31\"},{\"title\":\"Pit & Quarry 1931-04-22: Vol 22 Iss 2\",\"date\":\"1931-04-22\"},{\"title\":\"Pit and Quarry 1951-11: Vol 44 Iss 5\",\"date\":\"1951-11-01\"},{\"title\":\"Pit and Quarry 1952-03: Vol 44 Iss 9\",\"date\":\"1952-03-01\"},{\"title\":\"Pit and Quarry 1956-01: Vol 48 Iss 7\",\"date\":\"1956-01-01\"},{\"title\":\"Pit & Quarry 1918-05: Vol 2 Iss 6\",\"date\":\"1918-05-01\"},{\"title\":\"Pit & Quarry 1920-04: Vol 4 Iss 7\",\"date\":\"1920-04-01\"},{\"title\":\"Pit & Quarry 1922-11: Vol 7 Iss 2\",\"date\":\"1922-11-01\"},{\"title\":\"Pit & Quarry 1928-08-29: Vol 16 Iss 11\",\"date\":\"1928-08-29\"},{\"title\":\"Pit & Quarry 1929-03-27: Vol 17 Iss 13\",\"date\":\"1929-03-27\"},{\"title\":\"Pit & Quarry 1923-12: Vol 8 Iss 3\",\"date\":\"1923-12-01\"},{\"title\":\"Pit & Quarry 1927-06-22: Vol 14 Iss 6\",\"date\":\"1927-06-22\"},{\"title\":\"Pit & Quarry 1934-07: Vol 27 Iss 1\",\"date\":\"1934-07-01\"},{\"title\":\"Pit & Quarry 1936-06: Vol 28 Iss 12\",\"date\":\"1936-06-01\"},{\"title\":\"Pit and Quarry 1936-11: Vol 29 Iss 5\",\"date\":\"1936-11-01\"},{\"title\":\"Pit & Quarry 1939-02: Vol 31 Iss 8\",\"date\":\"1939-02-01\"},{\"title\":\"Pit & Quarry 1942-05: Vol 34 Iss 11\",\"date\":\"1942-05-01\"},{\"title\":\"Pit & Quarry 1943-07: Vol 36 Iss 1\",\"date\":\"1943-07-01\"},{\"title\":\"Pit & Quarry 1945-08: Vol 38 Iss 2\",\"date\":\"1945-08-01\"},{\"title\":\"Pit & Quarry 1946-03: Vol 38 Iss 9\",\"date\":\"1946-03-01\"},{\"title\":\"Pit & Quarry 1947-09: Vol 40 Iss 3\",\"date\":\"1947-09-01\"},{\"title\":\"Pit and Quarry 1956-08: Vol 49 Iss 2\",\"date\":\"1956-08-01\"},{\"title\":\"Pit and Quarry 1959-04: Vol 51 Iss 10\",\"date\":\"1959-04-01\"},{\"title\":\"Pit & Quarry 1961-06: Vol 53 Iss 12\",\"date\":\"1961-06-01\"},{\"title\":\"Pit and Quarry 1968 - 1969: Vol 61 Index\",\"date\":\"1968-01-01\"},{\"title\":\"Pit and Quarry 1969 - 1970: Vol 62 Index\",\"date\":\"1969-01-01\"},{\"title\":\"Pit & Quarry 1929-05-22: Vol 18 Iss 4\",\"date\":\"1929-05-22\"},{\"title\":\"Pit & Quarry 1929-11-20: Vol 19 Iss 4\",\"date\":\"1929-11-20\"},{\"title\":\"Pit & Quarry 1934-02: Vol 26 Iss 8\",\"date\":\"1934-02-01\"},{\"title\":\"Pit & Quarry 1940-01: Vol 32 Iss 7\",\"date\":\"1940-01-01\"},{\"title\":\"Pit & Quarry 1948-08: Vol 41 Iss 2\",\"date\":\"1948-08-01\"},{\"title\":\"Pit & Quarry 1948-11: Vol 41 Iss 5\",\"date\":\"1948-11-01\"},{\"title\":\"Pit and Quarry 1948-12: Vol 41 Iss 6\",\"date\":\"1948-12-01\"},{\"title\":\"Pit and Quarry 1947-08: Vol 40 Iss 2\",\"date\":\"1947-08-01\"},{\"title\":\"Pit & Quarry 1942-10: Vol 35 Iss 4\",\"date\":\"1942-10-01\"},{\"title\":\"Pit & Quarry 1950-06: Vol 42 Iss 12\",\"date\":\"1950-06-01\"},{\"title\":\"Pit and Quarry 1951-07: Vol 44 Iss 1\",\"date\":\"1951-07-01\"},{\"title\":\"Pit and Quarry 1954-06: Vol 46 Iss 12\",\"date\":\"1954-06-01\"},{\"title\":\"Pit & Quarry 1967: Vol 60 Index\",\"date\":\"1967-01-01\"},{\"title\":\"Pit & Quarry 1971 - 1972: Vol 64 Index\",\"date\":\"1971-01-01\"},{\"title\":\"Pit & Quarry 1981: Vol 73 Index\",\"date\":\"1981-01-01\"},{\"title\":\"Pit and Quarry July 1954-June 1955: Vol 47 Index\",\"date\":\"1954-07-01\"},{\"title\":\"Pit & Quarry 1932-05-04: Vol 24 Iss 3\",\"date\":\"1932-05-04\"},{\"title\":\"Pit and Quarry 1937-08: Vol 30 Iss 2\",\"date\":\"1937-08-01\"},{\"title\":\"Pit and Quarry 1959-01: Vol 51 Iss 7\",\"date\":\"1959-01-01\"},{\"title\":\"Pit and Quarry 1960-06: Vol 52 Iss 12\",\"date\":\"1960-06-01\"},{\"title\":\"Pit & Quarry 1960-10: Vol 53 Iss 4\",\"date\":\"1960-10-01\"},{\"title\":\"Pit & Quarry 1961-10: Vol 54 Iss 4\",\"date\":\"1961-10-01\"},{\"title\":\"Pit & Quarry 1932-03-09: Vol 23 Iss 12\",\"date\":\"1932-03-09\"},{\"title\":\"Pit & Quarry 1932-02-10: Vol 23 Iss 10\",\"date\":\"1932-02-10\"},{\"title\":\"Pit & Quarry 1932-03-23: Vol 23 Iss 13\",\"date\":\"1932-03-23\"},{\"title\":\"Pit & Quarry 1923-06: Vol 7 Iss 9\",\"date\":\"1923-06-01\"},{\"title\":\"Pit & Quarry 1925-03-15: Vol 9 Iss 12\",\"date\":\"1925-03-15\"},{\"title\":\"Pit & Quarry 1929-02-13: Vol 17 Iss 10\",\"date\":\"1929-02-13\"},{\"title\":\"Pit & Quarry 1933-12: Vol 26 Iss 6\",\"date\":\"1933-12-01\"},{\"title\":\"Pit & Quarry 1935-08: Vol 28 Iss 2\",\"date\":\"1935-08-01\"},{\"title\":\"Pit & Quarry 1936-07: Vol 29 Iss 1\",\"date\":\"1936-07-01\"},{\"title\":\"Pit and Quarry 1937-07: Vol 30 Iss 1\",\"date\":\"1937-07-01\"},{\"title\":\"Pit & Quarry 1926-06-15: Vol 12 Iss 6\",\"date\":\"1926-06-15\"},{\"title\":\"Pit & Quarry 1927-05-25: Vol 14 Iss 4\",\"date\":\"1927-05-25\"},{\"title\":\"Pit & Quarry 1946-02: Vol 38 Iss 8\",\"date\":\"1946-02-01\"},{\"title\":\"Pit & Quarry 1946-04: Vol 38 Iss 10\",\"date\":\"1946-04-01\"},{\"title\":\"Pit & Quarry 1947-05: Vol 39 Iss 11\",\"date\":\"1947-05-01\"},{\"title\":\"Pit and Quarry 1958-09: Vol 51 Iss 3\",\"date\":\"1958-09-01\"},{\"title\":\"Pit & Quarry 1932-04-20: Vol 24 Iss 2\",\"date\":\"1932-04-20\"},{\"title\":\"Pit & Quarry 1939-04: Vol 31 Iss 10\",\"date\":\"1939-04-01\"},{\"title\":\"Pit and Quarry 1940-08: Vol 33 Iss 2\",\"date\":\"1940-08-01\"},{\"title\":\"Pit & Quarry 1941-02: Vol 33 Iss 8\",\"date\":\"1941-02-01\"},{\"title\":\"Pit & Quarry 1944-04: Vol 36 Iss 10\",\"date\":\"1944-04-01\"},{\"title\":\"Pit and Quarry 1945-06: Vol 37 Iss 12\",\"date\":\"1945-06-01\"},{\"title\":\"Pit & Quarry 1945-10: Vol 38 Iss 4\",\"date\":\"1945-10-01\"},{\"title\":\"Pit and Quarry 1951-06: Vol 43 Iss 12\",\"date\":\"1951-06-01\"},{\"title\":\"Pit & Quarry 1948-10: Vol 41 Iss 4\",\"date\":\"1948-10-01\"},{\"title\":\"Pit and Quarry 1972 - 1973: Vol 65 Index\",\"date\":\"1972-01-01\"},{\"title\":\"Pit & Quarry 1982: Vol 74 Index\",\"date\":\"1982-01-01\"},{\"title\":\"Pit and Quarry 1959-03: Vol 51 Iss 9\",\"date\":\"1959-03-01\"},{\"title\":\"Pit and Quarry 1959-10: Vol 52 Iss 4\",\"date\":\"1959-10-01\"},{\"title\":\"Pit & Quarry 1925-06-01: Vol 10 Iss 5\",\"date\":\"1925-06-01\"},{\"title\":\"Pit & Quarry 1933-01: Vol 25 Iss 5\",\"date\":\"1933-01-01\"},{\"title\":\"Pit & Quarry 1936-05: Vol 28 Iss 11\",\"date\":\"1936-05-01\"},{\"title\":\"Pit & Quarry 1927-12-21: Vol 15 Iss 6\",\"date\":\"1927-12-21\"},{\"title\":\"Pit & Quarry 1940-04: Vol 32 Iss 10\",\"date\":\"1940-04-01\"},{\"title\":\"Pit & Quarry 1943-09: Vol 36 Iss 3\",\"date\":\"1943-09-01\"},{\"title\":\"Pit and Quarry 1949-02: Vol 41 Iss 8\",\"date\":\"1949-02-01\"},{\"title\":\"Pit & Quarry 1962: Vol 55 Index\",\"date\":\"1962-01-01\"},{\"title\":\"Pit & Quarry 1918-12: Vol 3 Iss 3\",\"date\":\"1918-12-01\"},{\"title\":\"Pit & Quarry 1921-01: Vol 5 Iss 4\",\"date\":\"1921-01-01\"},{\"title\":\"Pit & Quarry 1931-08-12: Vol 22 Iss 10\",\"date\":\"1931-08-12\"},{\"title\":\"Pit & Quarry 1931-11-18: Vol 23 Iss 4\",\"date\":\"1931-11-18\"},{\"title\":\"Pit and Quarry 1946-01: Vol 38 Iss 7\",\"date\":\"1946-01-01\"},{\"title\":\"Pit & Quarry 1946-05: Vol 38 Iss 11\",\"date\":\"1946-05-01\"},{\"title\":\"Pit & Quarry 1946-10: Vol 39 Iss 4\",\"date\":\"1946-10-01\"},{\"title\":\"Pit & Quarry 1947-06: Vol 39 Iss 12\",\"date\":\"1947-06-01\"},{\"title\":\"Pit & Quarry 1941-10: Vol 34 Iss 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8\",\"date\":\"1953-02-01\"},{\"title\":\"Pit and Quarry 1953-05: Vol 45 Iss 11\",\"date\":\"1953-05-01\"},{\"title\":\"Pit & Quarry 1925-08-15: Vol 10 Iss 10\",\"date\":\"1925-08-15\"},{\"title\":\"Pit & Quarry 1930-11-19: Vol 21 Iss 4\",\"date\":\"1930-11-19\"},{\"title\":\"Pit & Quarry 1929-12-04: Vol 19 Iss 5\",\"date\":\"1929-12-04\"},{\"title\":\"Pit & Quarry 1930-04-23: Vol 20 Iss 2\",\"date\":\"1930-04-23\"},{\"title\":\"Pit & Quarry 1927-08-17: Vol 14 Iss 10\",\"date\":\"1927-08-17\"},{\"title\":\"Pit & Quarry 1927-10-26: Vol 15 Iss 2\",\"date\":\"1927-10-26\"},{\"title\":\"Pit and Quarry 1958-08: Vol 51 Iss 2\",\"date\":\"1958-08-01\"},{\"title\":\"Pit & Quarry 1960-12: Vol 53 Iss 6\",\"date\":\"1960-12-01\"},{\"title\":\"Pit & Quarry 1961-07: Vol 54 Iss 1\",\"date\":\"1961-07-01\"},{\"title\":\"Pit & Quarry 1930-07-16: Vol 20 Iss 8\",\"date\":\"1930-07-16\"},{\"title\":\"Pit & Quarry 1930-10-08: Vol 21 Iss 1\",\"date\":\"1930-10-08\"},{\"title\":\"Pit & Quarry 1931-10-07: 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11\",\"date\":\"1930-08-27\"},{\"title\":\"Pit & Quarry 1930-12-17: Vol 21 Iss 6\",\"date\":\"1930-12-17\"},{\"title\":\"Pit & Quarry 1928 - 1929: Vol 17 Index\",\"date\":\"1928-01-01\"},{\"title\":\"Pit & Quarry 1929-03-13: Vol 17 Iss 12\",\"date\":\"1929-03-13\"},{\"title\":\"Pit & Quarry 1932-08-10: Vol 24 Iss 10\",\"date\":\"1932-08-10\"},{\"title\":\"Pit & Quarry 1935-11: Vol 28 Iss 5\",\"date\":\"1935-11-01\"},{\"title\":\"Pit & Quarry 1936-01: Vol 28 Iss 7\",\"date\":\"1936-01-01\"},{\"title\":\"Pit and Quarry 1936-08: Vol 29 Iss 2\",\"date\":\"1936-08-01\"},{\"title\":\"Pit and Quarry 1936-12: Vol 29 Iss 6\",\"date\":\"1936-12-01\"},{\"title\":\"Pit and Quarry 1937-01: Vol 29 Iss 7\",\"date\":\"1937-01-01\"},{\"title\":\"Pit and Quarry 1937-10: Vol 30 Iss 4\",\"date\":\"1937-10-01\"},{\"title\":\"Pit & Quarry 1938-11: Vol 31 Iss 5\",\"date\":\"1938-11-01\"},{\"title\":\"Pit and Quarry 1939-07: Vol 32 Iss 1\",\"date\":\"1939-07-01\"},{\"title\":\"Pit and Quarry 1945-05: Vol 37 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1996)\",\"date\":\"1996-01-01\"},{\"title\":\"Subterranea 44 (April 2017)\",\"date\":\"2017-04-01\"},{\"title\":\"Subterranea 50 (April 2019)\",\"date\":\"2019-04-01\"},{\"title\":\"Subterranea 27 (September 2011)\",\"date\":\"2011-09-01\"},{\"title\":\"Siren 4 (Spring 1997)\",\"date\":\"1997-01-01\"},{\"title\":\"Subterranea 10 (April 2006)\",\"date\":\"2006-04-01\"},{\"title\":\"Subterranea 25 (December 2010)\",\"date\":\"2010-12-01\"},{\"title\":\"Subterranea 53 (April 2020)\",\"date\":\"2020-04-01\"},{\"title\":\"Subterranea 58 (December 2021)\",\"date\":\"2021-12-01\"},{\"title\":\"Secretary's Newsletter 15 (1995)\",\"date\":\"1995-01-01\"},{\"title\":\"Newsletter 2 (September 1984)\",\"date\":\"1984-09-01\"},{\"title\":\"Subterranea 31 (December 2012)\",\"date\":\"2012-12-01\"},{\"title\":\"Subterranea 37 (December 2014)\",\"date\":\"2014-12-01\"},{\"title\":\"Subterranea 48 (August 2018)\",\"date\":\"2018-08-01\"},{\"title\":\"Siren 7 (Winter 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2012)\",\"date\":\"2012-04-01\"},{\"title\":\"Secretary's Newsletter 18 (1997)\",\"date\":\"1997-01-01\"},{\"title\":\"Bulletin 7 (January 1978)\",\"date\":\"1978-01-01\"},{\"title\":\"Bulletin 9 (January 1979)\",\"date\":\"1979-01-01\"},{\"title\":\"Secretary's Newsletter 22 (1999)\",\"date\":\"1999-01-01\"},{\"title\":\"Subterranea 11 (August 2006)\",\"date\":\"2006-08-01\"},{\"title\":\"Subterranea 3 (December 2003)\",\"date\":\"2003-12-01\"},{\"title\":\"Subterranea 34 (December 2013)\",\"date\":\"2013-12-01\"},{\"title\":\"Subterranea 8 (September 2005)\",\"date\":\"2005-09-01\"},{\"title\":\"Bulletin 29 (1993)\",\"date\":\"1993-01-01\"},{\"title\":\"Secretary's Newsletter 24 (2002)\",\"date\":\"2002-01-01\"},{\"title\":\"Secretary's Newsletter 14 (1995)\",\"date\":\"1995-01-01\"},{\"title\":\"Siren 10 (Spring 2002)\",\"date\":\"2002-01-01\"},{\"title\":\"Secretary's Newsletter 17 (1996)\",\"date\":\"1996-01-01\"},{\"title\":\"Newsletter 12 (May 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2003)\",\"date\":\"2003-01-01\"},{\"title\":\"Subterranea 22 (April 2010)\",\"date\":\"2010-04-01\"},{\"title\":\"Bulletin 25 (February 1989)\",\"date\":\"1989-02-01\"},{\"title\":\"Subterranea 47 (April 2018)\",\"date\":\"2018-04-01\"},{\"title\":\"Subterranea 5 (September 2004)\",\"date\":\"2004-09-01\"},{\"title\":\"Subterranea 55 (December 2020)\",\"date\":\"2020-12-01\"},{\"title\":\"Subterranea 12 (December 2006)\",\"date\":\"2006-12-01\"},{\"title\":\"Subterranea 2 (July 2003)\",\"date\":\"2003-07-01\"},{\"title\":\"Bulletin 30 (1994)\",\"date\":\"1994-01-01\"},{\"title\":\"Bulletin 4 (August 1976)\",\"date\":\"1976-08-01\"},{\"title\":\"Subterranea 39 (August 2015)\",\"date\":\"2015-08-01\"},{\"title\":\"Subterranea 14 (August 2007)\",\"date\":\"2007-08-01\"},{\"title\":\"Subterranea 18 (January 2009)\",\"date\":\"2009-01-01\"},{\"title\":\"Bulletin 13 (January 1981)\",\"date\":\"1981-01-01\"},{\"title\":\"Bulletin 6 (August 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2018\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl78.pdf\",\"date\":\"\"},{\"title\":\"Autumn 2018\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl79.pdf\",\"date\":\"\"},{\"title\":\"Spring 2019\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl80.pdf\",\"date\":\"\"},{\"title\":\"Autumn 2019\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl81.pdf\",\"date\":\"\"},{\"title\":\"Spring 2020\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-82-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Autumn 2020\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-83-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Spring 2021\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-84-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Autumn 2021\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-85-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Spring 2022\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/Newsletter-86-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Autumn 2022\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/Newsletter-87-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Spring 2023\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/Newsletter-88-FINAL.pdf\",\"date\":\"\"},{\"title\":\"Autumn 2023\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/89.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/49.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/50.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/51.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl052.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl053.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/54.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/55.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/56.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/57.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/58.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/59.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/60.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/61.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/62.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/63.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/64.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/65.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/66.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/67.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/68.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/69.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/70.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/71.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/72.pdf\",\"date\":\"\"},{\"title\":\"Winter 2015\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/73.pdf\",\"date\":\"\"},{\"title\":\"50\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/50.pdf\",\"date\":\"\"},{\"title\":\"No.22, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-22.pdf\",\"date\":\"\"},{\"title\":\"No.23, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/23.pdf\",\"date\":\"\"},{\"title\":\"No.24, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/24.pdf\",\"date\":\"\"},{\"title\":\"No.25, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/Newsletter-25.pdf\",\"date\":\"\"},{\"title\":\"No.26, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-26.pdf\",\"date\":\"\"},{\"title\":\"No.27, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/27.pdf\",\"date\":\"\"},{\"title\":\"No.28, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/28.pdf\",\"date\":\"\"},{\"title\":\"No.29, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-29.pdf\",\"date\":\"\"},{\"title\":\"No.30, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/30.pdf\",\"date\":\"\"},{\"title\":\"No.31, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-31.pdf\",\"date\":\"\"},{\"title\":\"No.32, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-32.pdf\",\"date\":\"\"},{\"title\":\"No.33, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/33.pdf\",\"date\":\"\"},{\"title\":\"No.34, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/34.pdf\",\"date\":\"\"},{\"title\":\"No.35, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/NEWSLETTER-35.pdf\",\"date\":\"\"},{\"title\":\"No.36, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/36.pdf\",\"date\":\"\"},{\"title\":\"No.37, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/37.pdf\",\"date\":\"\"},{\"title\":\"No\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/38.pdf\",\"date\":\"\"},{\"title\":\"No.39, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/39.pdf\",\"date\":\"\"},{\"title\":\"No.40, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/40.pdf\",\"date\":\"\"},{\"title\":\"No.41, Nov\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/41.pdf\",\"date\":\"\"},{\"title\":\"No.42, Apr\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/42.pdf\",\"date\":\"\"},{\"title\":\"o.43, Oct\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/43.pdf\",\"date\":\"\"},{\"title\":\"No.44, Apr\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/44.pdf\",\"date\":\"\"},{\"title\":\"No.45, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/45.pdf\",\"date\":\"\"},{\"title\":\"No.46, Apr\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/46-497t.pdf\",\"date\":\"\"},{\"title\":\"No.47, Oct\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/47.pdf\",\"date\":\"\"},{\"title\":\"Copper Ingots\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/Copper-Ingots-from-the-shipwreck-of-the-SS-St.pdf\",\"date\":\"\"},{\"title\":\"No.48, Apr\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/48.pdf\",\"date\":\"\"},{\"title\":\"Index 1-53\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/nl_index_1980-2005.pdf\",\"date\":\"\"},{\"title\":\"Index 54-89\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/WMSNLIndexPt2.pdf\",\"date\":\"\"},{\"title\":\"April 1980\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl01.pdf\",\"date\":\"\"},{\"title\":\"June 1980\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_agfm.pdf\",\"date\":\"\"},{\"title\":\"December 1980\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl02.pdf\",\"date\":\"\"},{\"title\":\"No 3 June 1981\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/wms_nl003.pdf\",\"date\":\"\"},{\"title\":\"No. 4, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/4.pdf\",\"date\":\"\"},{\"title\":\"No. 5, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/5.pdf\",\"date\":\"\"},{\"title\":\"No. 6, Aug\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/6.pdf\",\"date\":\"\"},{\"title\":\"No. 7, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/7.pdf\",\"date\":\"\"},{\"title\":\"No. 8, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/8.pdf\",\"date\":\"\"},{\"title\":\"No. 9, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/9.pdf\",\"date\":\"\"},{\"title\":\"No.10, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/10.pdf\",\"date\":\"\"},{\"title\":\"No.11, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/11.pdf\",\"date\":\"\"},{\"title\":\"No.12, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/12-saxs.pdf\",\"date\":\"\"},{\"title\":\"No.13, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/13.pdf\",\"date\":\"\"},{\"title\":\"No.14, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/14.pdf\",\"date\":\"\"},{\"title\":\"No.15, Dec\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/15.pdf\",\"date\":\"\"},{\"title\":\"No.16, Jun\",\"url\":\"https://www.welshmines.org/previousnewsletters/s/16.pdf\",\"date\":\"\"},{\"title\":\"No.17, 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Pioneer Derbyshire Geologist\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%201-7%20-%20White%20Watson%20-%20Pioneer%20Derbyshire%20Geologist.pdf\" }, { \"title\": \"Bulletin 1-7 - Yatestoop Sough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%201-7%20-%20Yatestoop%20Sough.pdf\" }, { \"title\": \"Bulletin 2-1 - Discussion - Long Rake\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-1%20-%20Discussion%20-%20Long%20Rake.pdf\" }, { \"title\": \"Bulletin 2-1 - Great Hucklow Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-1%20-%20Great%20Hucklow%20Mines.pdf\" }, { \"title\": \"Bulletin 2-1 - Gypsum Working in South Derbyshire - Supplementary Notes\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-1%20-%20Gypsum%20Working%20in%20South%20Derbyshire%20-%20Supplementary%20Notes.pdf\" }, { \"title\": \"Bulletin 2-1 - Lathkilldale - Its Mines and Miners\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-1%20-%20Lathkilldale%20-%20Its%20Mines%20and%20Miners.pdf\" }, { \"title\": \"Bulletin 2-1 - The Mines North-West of Monyash - Part 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-1%20-%20The%20Mines%20North-West%20of%20Monyash%20-%20Part%203.pdf\" }, { \"title\": \"Bulletin 2-1 - The Transport of Lead - A Contribution to the Geography of Lead Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-1%20-%20The%20Transport%20of%20Lead%20-%20A%20Contribution%20to%20the%20Geography%20of%20Lead%20Mining.pdf\" }, { \"title\": \"Bulletin 2-2 - Discussion\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20Discussion.pdf\" }, { \"title\": \"Bulletin 2-2 - Old Mill Close Mine, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20Old%20Mill%20Close%20Mine,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 2-2 - Polymorphous Calcium Carbonate\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20Polymorphous%20Calcium%20Carbonate.pdf\" }, { \"title\": \"Bulletin 2-2 - Recent Exploration of Hillcarr Sough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20Recent%20Exploration%20of%20Hillcarr%20Sough.pdf\" }, { \"title\": \"Bulletin 2-2 - Survey of the South Shropshire Mining Area - 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20Survey%20of%20the%20South%20Shropshire%20Mining%20Area%20-%201.pdf\" }, { \"title\": \"Bulletin 2-2 - The North Side of Ashford Lordship\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20The%20North%20Side%20of%20Ashford%20Lordship.pdf\" }, { \"title\": \"Bulletin 2-2 - The Peak District in the Great Exhibition\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20The%20Peak%20District%20in%20the%20Great%20Exhibition.pdf\" }, { \"title\": \"Bulletin 2-2 - The Story of Old Sal\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-2%20-%20The%20Story%20of%20Old%20Sal.pdf\" }, { \"title\": \"Bulletin 2-3 - Discovery of a Cavern on Crosslow Rake, Foolow, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-3%20-%20Discovery%20of%20a%20Cavern%20on%20Crosslow%20Rake,%20Foolow,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 2-3 - Survey of the South Shropshire Lead Mining Area Part 2 - The Eastern Region\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-3%20-%20Survey%20of%20the%20South%20Shropshire%20Lead%20Mining%20Area%20Part%202%20-%20The%20Eastern%20Region.pdf\" }, { \"title\": \"Bulletin 2-3 - The Peak District Mineral Index\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-3%20-%20The%20Peak%20District%20Mineral%20Index.pdf\" }, { \"title\": \"Bulletin 2-3 - Wheels Rake, Alport-by-Youlgreave\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-3%20-%20Wheels%20Rake,%20Alport-by-Youlgreave.pdf\" }, { \"title\": \"Bulletin 2-4 - A General Survey of Present-day Mining in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-4%20-%20A%20General%20Survey%20of%20Present-day%20Mining%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 2-4 - Gypsum in Nottinghamshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-4%20-%20Gypsum%20in%20Nottinghamshire.pdf\" }, { \"title\": \"Bulletin 2-4 - Hourdlo Steel Pipe, Castleton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-4%20-%20Hourdlo%20Steel%20Pipe,%20Castleton.pdf\" }, { \"title\": \"Bulletin 2-4 - Notes on the High Rake Lead Mine, Windmill\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-4%20-%20Notes%20on%20the%20High%20Rake%20Lead%20Mine,%20Windmill.pdf\" }, { \"title\": \"Bulletin 2-4 - The Black Marble Mines of Ashford-in-the-Water\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-4%20-%20The%20Black%20Marble%20Mines%20of%20Ashford-in-the-Water.pdf\" }, { \"title\": \"Bulletin 2-4 - Whale Sough and Hubberdale Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-4%20-%20Whale%20Sough%20and%20Hubberdale%20Mine.pdf\" }, { \"title\": \"Bulletin 2-5 - Barthelemy Faujas de St. Fond\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-5%20-%20Barthelemy%20Faujas%20de%20St.%20Fond.pdf\" }, { \"title\": \"Bulletin 2-5 - Eyam Edge Mines and Soughs - Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-5%20-%20Eyam%20Edge%20Mines%20and%20Soughs%20-%20Part%201.pdf\" }, { \"title\": \"Bulletin 2-5 - Mineral Wealth of Coalbrookdale - Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-5%20-%20Mineral%20Wealth%20of%20Coalbrookdale%20-%20Part%201.pdf\" }, { \"title\": \"Bulletin 2-5 - Roman Lead Mining in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-5%20-%20Roman%20Lead%20Mining%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 2-5 - Stafford's Dream\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-5%20-%20Stafford's%20Dream.pdf\" }, { \"title\": \"Bulletin 2-6 - An Attempt to Mine China Clay in Derbyshire in the 18th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20An%20Attempt%20to%20Mine%20China%20Clay%20in%20Derbyshire%20in%20the%2018th%20Century.pdf\" }, { \"title\": \"Bulletin 2-6 - A Visit to the Tri-State Lead Mining District, U.S.A.\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20A%20Visit%20to%20the%20Tri-State%20Lead%20Mining%20District,%20U.S.A..pdf\" }, { \"title\": \"Bulletin 2-6 - Extract from Shrewsbury Chronicle - 1839\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20Extract%20from%20Shrewsbury%20Chronicle%20-%201839.pdf\" }, { \"title\": \"Bulletin 2-6 - Eyam Edge Mines and Soughs - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20Eyam%20Edge%20Mines%20and%20Soughs%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 2-6 - Index to Volume 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20Index%20to%20Volume%202.pdf\" }, { \"title\": \"Bulletin 2-6 - Kisdon Mining Company, Swaledale, Yorkshire - Part 1 - Sir Georges Level\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20Kisdon%20Mining%20Company,%20Swaledale,%20Yorkshire%20-%20Part%201%20-%20Sir%20Georges%20Level.pdf\" }, { \"title\": \"Bulletin 2-6 - Notes and Reviews\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20Notes%20and%20Reviews.pdf\" }, { \"title\": \"Bulletin 2-6 - Record Breaking or Record Making\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20Record%20Breaking%20or%20Record%20Making.pdf\" }, { \"title\": \"Bulletin 2-6 - The Mineral Wealth of Coalbrookdale - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20The%20Mineral%20Wealth%20of%20Coalbrookdale%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 2-6 - The Secular Variation of Magnetic North\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%202-6%20-%20The%20Secular%20Variation%20of%20Magnetic%20North.pdf\" }, { \"title\": \"Bulletin 3-1 - A List of Soughs of the Derbyshire Lead Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-1%20-%20A%20List%20of%20Soughs%20of%20the%20Derbyshire%20Lead%20Mines.pdf\" }, { \"title\": \"Bulletin 3-1 - Biographical Notes of Authors on Derbyshire - J.J. Ferber\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-1%20-%20Biographical%20Notes%20of%20Authors%20on%20Derbyshire%20-%20J.J.%20Ferber.pdf\" }, { \"title\": \"Bulletin 3-1 - Eyam Edge Mines and Soughs - Part 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-1%20-%20Eyam%20Edge%20Mines%20and%20Soughs%20-%20Part%203.pdf\" }, { \"title\": \"Bulletin 3-1 - Lathkill Dale - Its Mines and Miners - Supplementary Notes\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-1%20-%20Lathkill%20Dale%20-%20Its%20Mines%20and%20Miners%20-%20Supplementary%20Notes.pdf\" }, { \"title\": \"Bulletin 3-1 - Notes and Inpressions of Jingler Mine, Wakebridge, Crich\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-1%20-%20Notes%20and%20Inpressions%20of%20Jingler%20Mine,%20Wakebridge,%20Crich.pdf\" }, { \"title\": \"Bulletin 3-1 - The Kisdon Mining Company, Swaledale, Yorkshire - Part 2 - Myton Level\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-1%20-%20The%20Kisdon%20Mining%20Company,%20Swaledale,%20Yorkshire%20%20-%20Part%202%20-%20Myton%20Level.pdf\" }, { \"title\": \"Bulletin 3-2 - Biographical Notes of Authors on Derbyshire - Gideon Algernon Mantell\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-2%20-%20Biographical%20Notes%20of%20Authors%20on%20Derbyshire%20-%20Gideon%20Algernon%20Mantell.pdf\" }, { \"title\": \"Bulletin 3-2 - Eyam Edge Mines and Soughs - Part 4\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-2%20-%20Eyam%20Edge%20Mines%20and%20Soughs%20-%20Part%204.pdf\" }, { \"title\": \"Bulletin 3-2 - Field Groove Mine Sheldon, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-2%20-%20Field%20Groove%20Mine%20Sheldon,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 3-2 - Supplementary Notes on the Mineral Wealth of Coalbrookdale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-2%20-%20Supplementary%20Notes%20on%20the%20Mineral%20Wealth%20of%20Coalbrookdale.pdf\" }, { \"title\": \"Bulletin 3-2 - The End of an Era\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-2%20-%20The%20End%20of%20an%20Era.pdf\" }, { \"title\": \"Bulletin 3-2 - The Kisdon Mining Company, Swaledale, Yorkshire - Part 3 - The Boundary of the Company and Guy's Level\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-2%20-%20The%20Kisdon%20Mining%20Company,%20Swaledale,%20Yorkshire%20-%20Part%203%20-%20The%20Boundary%20of%20the%20Company%20and%20Guy's%20Level.pdf\" }, { \"title\": \"Bulletin 3-3 - Anston Stone The Stone for the Building of the Houses of Parliament\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20Anston%20Stone%20The%20Stone%20for%20the%20Building%20of%20the%20Houses%20of%20Parliament.pdf\" }, { \"title\": \"Bulletin 3-3 - Ball Eye Mine and Sough, Cromford\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20Ball%20Eye%20Mine%20and%20Sough,%20Cromford.pdf\" }, { \"title\": \"Bulletin 3-3 - Field Meeting at Castleton - Report of the Director - 4th December 1966\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20Field%20Meeting%20at%20Castleton%20-%20Report%20of%20the%20Director%20-%204th%20December%201966.pdf\" }, { \"title\": \"Bulletin 3-3 - Pyromorphite from the Mines of West Shropshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20Pyromorphite%20from%20the%20Mines%20of%20West%20Shropshire.pdf\" }, { \"title\": \"Bulletin 3-3 - The Formation of the Peak District Mines Historical Society\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20The%20Formation%20of%20the%20Peak%20District%20Mines%20Historical%20Society.pdf\" }, { \"title\": \"Bulletin 3-3 - The Kisdon Mining Company, Swaledale, Yorkshire - Part 4 - The Kisdon Shaft and Alton's Level\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20The%20Kisdon%20Mining%20Company,%20Swaledale,%20Yorkshire%20-%20Part%204%20-%20The%20Kisdon%20Shaft%20and%20Alton's%20Level.pdf\" }, { \"title\": \"Bulletin 3-3 - The Mining of Raddle in the Rotherham Area\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20The%20Mining%20of%20Raddle%20in%20the%20Rotherham%20Area.pdf\" }, { \"title\": \"Bulletin 3-3 - The Working of Rottenstone in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20The%20Working%20of%20Rottenstone%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 3-3 - Whetstone Mining at Gillow Heath, near Biddulph, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-3%20-%20Whetstone%20Mining%20at%20Gillow%20Heath,%20near%20Biddulph,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 3-4 - A Visit to Stanhopeburn Mine, Weardale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20A%20Visit%20to%20Stanhopeburn%20Mine,%20Weardale.pdf\" }, { \"title\": \"Bulletin 3-4 - Biographical Notes on Derbyshire Authors - Karl Philipp Moritz\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20Biographical%20Notes%20on%20Derbyshire%20Authors%20-%20Karl%20Philipp%20Moritz.pdf\" }, { \"title\": \"Bulletin 3-4 - Field Meeting to Millers Dale - May 1967\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20Field%20Meeting%20to%20Millers%20Dale%20-%20May%201967.pdf\" }, { \"title\": \"Bulletin 3-4 - Field Meeting to Snake Mine and Wester Hollow - June 1967\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20Field%20Meeting%20to%20Snake%20Mine%20and%20Wester%20Hollow%20-%20June%201967.pdf\" }, { \"title\": \"Bulletin 3-4 - Oakenedge, Streaks, and Watergrove Soughs\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20Oakenedge,%20Streaks,%20and%20Watergrove%20Soughs.pdf\" }, { \"title\": \"Bulletin 3-4 - Ore Buddles at Snake Mine, Hopton and at Bonsall Leys\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20Ore%20Buddles%20at%20Snake%20Mine,%20Hopton%20and%20at%20Bonsall%20Leys.pdf\" }, { \"title\": \"Bulletin 3-4 - Some Accounts of an 18th Century Lead Mining Agent in Great Longstone 1766 to 1827\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20Some%20Accounts%20of%20an%2018th%20Century%20Lead%20Mining%20Agent%20in%20Great%20Longstone%201766%20to%201827.pdf\" }, { \"title\": \"Bulletin 3-4 - The Kisdon Mining Company, Swaledale, Yorkshire - Part 5- Acre Walls Vein\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-4%20-%20The%20Kisdon%20Mining%20Company,%20Swaledale,%20Yorkshire%20-%20Part%205-%20Acre%20Walls%20Vein.pdf\" }, { \"title\": \"Bulletin 3-5 - Dr. Linden, William Hooson and North Welsh Mining in the mid 18th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Dr.%20Linden,%20William%20Hooson%20and%20North%20Welsh%20Mining%20in%20the%20mid%2018th%20Century.pdf\" }, { \"title\": \"Bulletin 3-5 - Index to the Mining Records in the Bagshaw Collection in the John Rylands Library, Manchester - Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Index%20to%20the%20Mining%20Records%20in%20the%20Bagshaw%20Collection%20in%20the%20John%20Rylands%20Library,%20Manchester%20-%20Part%201.pdf\" }, { \"title\": \"Bulletin 3-5 - Notes on the Caves of Anston Stones near Sheffield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Notes%20on%20the%20Caves%20of%20Anston%20Stones%20near%20Sheffield.pdf\" }, { \"title\": \"Bulletin 3-5 - Snake Mine, Hoptonwood, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Snake%20Mine,%20Hoptonwood,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 3-5 - The Kisdon Mining Company, Swaledale, Yorkshire - Part 6\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20The%20Kisdon%20Mining%20Company,%20Swaledale,%20Yorkshire%20-%20Part%206.pdf\" }, { \"title\": \"Bulletin 3-5 - Watergrove Mine - A Supplementary Note\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Watergrove%20Mine%20-%20A%20Supplementary%20Note.pdf\" }, { \"title\": \"Bulletin 3-5 - Water Icicle Close Mine, Monyash\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Water%20Icicle%20Close%20Mine,%20Monyash.pdf\" }, { \"title\": \"Bulletin 3-5 - Winster and 18th Century Lead Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-5%20-%20Winster%20and%2018th%20Century%20Lead%20Mining.pdf\" }, { \"title\": \"Bulletin 3-6 - A Report on Nestus Mine and other Shafts on the Heights of Abraham, Matlock Bath, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20A%20Report%20on%20Nestus%20Mine%20and%20other%20Shafts%20on%20the%20Heights%20of%20Abraham,%20Matlock%20Bath,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 3-6 - Derbyshire Influences on Lead Mining in North Wales in the 17th and 18th Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Derbyshire%20Influences%20on%20Lead%20Mining%20in%20North%20Wales%20in%20the%2017th%20and%2018th%20Centuries.pdf\" }, { \"title\": \"Bulletin 3-6 - Field Meeting in Cromford - Middleton area held 20th August 1967\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Field%20Meeting%20in%20Cromford%20-%20Middleton%20area%20held%2020th%20August%201967.pdf\" }, { \"title\": \"Bulletin 3-6 - Index to the Mining Records in the Bagshaw Collection in the John Rylands Library, Manchester - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Index%20to%20the%20Mining%20Records%20in%20the%20Bagshaw%20Collection%20in%20the%20John%20Rylands%20Library,%20Manchester%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 3-6 - Lead Mining Documents in the Derbyshire Record Office\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Lead%20Mining%20Documents%20in%20the%20Derbyshire%20Record%20Office.pdf\" }, { \"title\": \"Bulletin 3-6 - On Being Elected to the Grand Jury of the Barmote Court\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20On%20Being%20Elected%20to%20the%20Grand%20Jury%20of%20the%20Barmote%20Court.pdf\" }, { \"title\": \"Bulletin 3-6 - Soughs in Middleton Dale - Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Soughs%20in%20Middleton%20Dale%20-%20Part%201.pdf\" }, { \"title\": \"Bulletin 3-6 - Stone Edge Cupola\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Stone%20Edge%20Cupola.pdf\" }, { \"title\": \"Bulletin 3-6 - The Capping of Knotlow Engine Shaft\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20The%20Capping%20of%20Knotlow%20Engine%20Shaft.pdf\" }, { \"title\": \"Bulletin 3-6 - The Kirkby Lead Mining Manuscript Collection\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20The%20Kirkby%20Lead%20Mining%20Manuscript%20Collection.pdf\" }, { \"title\": \"Bulletin 3-6 - The Magpie Mine Engine House, Sheldon, Derbyshire, 1864\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20The%20Magpie%20Mine%20Engine%20House,%20Sheldon,%20Derbyshire,%201864.pdf\" }, { \"title\": \"Bulletin 3-6 - Title Pages and Index for Volume 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%203-6%20-%20Title%20Pages%20and%20Index%20for%20Volume%203.pdf\" }, { \"title\": \"Bulletin 4-1 - A Manhole Cover for Snake Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20A%20Manhole%20Cover%20for%20Snake%20Mine.pdf\" }, { \"title\": \"Bulletin 4-1 - A Survey of Mandale Mine, Lathkill Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20A%20Survey%20of%20Mandale%20Mine,%20Lathkill%20Dale.pdf\" }, { \"title\": \"Bulletin 4-1 - Charles Henry Millington, 1878 to 1968 - An Appreciation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Charles%20Henry%20Millington,%201878%20to%201968%20-%20An%20Appreciation.pdf\" }, { \"title\": \"Bulletin 4-1 - Cupola Lead Smelting Sites in Derbyshire, 1737 to 1900\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Cupola%20Lead%20Smelting%20Sites%20in%20Derbyshire,%201737%20to%201900.pdf\" }, { \"title\": \"Bulletin 4-1 - Discovery of an Unusual 'Lime Kiln', at Hassop, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Discovery%20of%20an%20Unusual%20'Lime%20Kiln',%20at%20Hassop,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 4-1 - Early Mining Techniques in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Early%20Mining%20Techniques%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 4-1 - Index to the Records in the John Rylands Library - Part 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Index%20to%20the%20Records%20in%20the%20John%20Rylands%20Library%20-%20Part%203.pdf\" }, { \"title\": \"Bulletin 4-1 - Lead-Glazed Roman Pottery found near Derby\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Lead-Glazed%20Roman%20Pottery%20found%20near%20Derby.pdf\" }, { \"title\": \"Bulletin 4-1 - Mine Fatalities in the Derbyshire Metalliferous Mining Area, 1874 to 1939\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Mine%20Fatalities%20in%20the%20Derbyshire%20Metalliferous%20Mining%20Area,%201874%20to%201939.pdf\" }, { \"title\": \"Bulletin 4-1 - Notes on the Derbyshire Map Surveyed and Produced by Peter Perez Burdett, 1762 to 1767\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20Notes%20on%20the%20Derbyshire%20Map%20Surveyed%20and%20Produced%20by%20Peter%20Perez%20Burdett,%201762%20to%201767.pdf\" }, { \"title\": \"Bulletin 4-1 - The Derbyshire Barmote Court\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20The%20Derbyshire%20Barmote%20Court.pdf\" }, { \"title\": \"Bulletin 4-1 - The Lead Miner of Longstone Church\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20The%20Lead%20Miner%20of%20Longstone%20Church.pdf\" }, { \"title\": \"Bulletin 4-1 - The Quest for a Lost Lead Mine in Leicestershire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-1%20-%20The%20Quest%20for%20a%20Lost%20Lead%20Mine%20in%20Leicestershire.pdf\" }, { \"title\": \"Bulletin 4-2 - A Miners Porringer found on Longstone Edge\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20A%20Miners%20Porringer%20found%20on%20Longstone%20Edge.pdf\" }, { \"title\": \"Bulletin 4-2 - A Note on the Price of Lead 1730 to 1900\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20A%20Note%20on%20the%20Price%20of%20Lead%201730%20to%201900.pdf\" }, { \"title\": \"Bulletin 4-2 - Ecton Hill - A Study of the Surface Features\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20Ecton%20Hill%20-%20A%20Study%20of%20the%20Surface%20Features.pdf\" }, { \"title\": \"Bulletin 4-2 - Lead Mining in the Wirksworth District during the late Eighteenth and early Nineteenth Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20Lead%20Mining%20in%20the%20Wirksworth%20District%20during%20the%20late%20Eighteenth%20and%20early%20Nineteenth%20Centuries.pdf\" }, { \"title\": \"Bulletin 4-2 - Settlingstones - The Worlds Last Witherite Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20Settlingstones%20-%20The%20Worlds%20Last%20Witherite%20Mine.pdf\" }, { \"title\": \"Bulletin 4-2 - The Ecton Copper Mines in the Seventeenth Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20The%20Ecton%20Copper%20Mines%20in%20the%20Seventeenth%20Century.pdf\" }, { \"title\": \"Bulletin 4-2 - The Soughs of Derbyshire Lead Mines - Supplementary List\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-2%20-%20The%20Soughs%20of%20Derbyshire%20Lead%20Mines%20-%20Supplementary%20List.pdf\" }, { \"title\": \"Bulletin 4-3 - Ecton Hill - Part 2 - Underground\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Ecton%20Hill%20-%20Part%202%20-%20Underground.pdf\" }, { \"title\": \"Bulletin 4-3 - Notes on the Sand Workings in the Doncaster Area\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Notes%20on%20the%20Sand%20Workings%20in%20the%20Doncaster%20Area.pdf\" }, { \"title\": \"Bulletin 4-3 - Report of a Field Meeting at Cromford Meadows, Derbyshire - 21st September\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Report%20of%20a%20Field%20Meeting%20at%20Cromford%20Meadows,%20Derbyshire%20-%2021st%20September.pdf\" }, { \"title\": \"Bulletin 4-3 - Report on the Crich Mining Display at the Tramway Museum, Crich\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Report%20on%20the%20Crich%20Mining%20Display%20at%20the%20Tramway%20Museum,%20Crich.pdf\" }, { \"title\": \"Bulletin 4-3 - Some Archival Sources of Information on Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Some%20Archival%20Sources%20of%20Information%20on%20Mines.pdf\" }, { \"title\": \"Bulletin 4-3 - Supplementary Notes on the Working of Raddle at Micklebring, Rotherham\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Supplementary%20Notes%20on%20the%20Working%20of%20Raddle%20at%20Micklebring,%20Rotherham.pdf\" }, { \"title\": \"Bulletin 4-3 - Two Lead Smelting Mills in North Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-3%20-%20Two%20Lead%20Smelting%20Mills%20in%20North%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 4-4 - A Survey of Ball Eye Mines, Bonsall\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20A%20Survey%20of%20Ball%20Eye%20Mines,%20Bonsall.pdf\" }, { \"title\": \"Bulletin 4-4 - Hand-Built for the Job - An Example of Early Metallurgical Craftsmanship\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20Hand-Built%20for%20the%20Job%20-%20An%20Example%20of%20Early%20Metallurgical%20Craftsmanship.pdf\" }, { \"title\": \"Bulletin 4-4 - Magpie Mine and the Garlick Family 1881-1930\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20Magpie%20Mine%20and%20the%20Garlick%20Family%201881-1930.pdf\" }, { \"title\": \"Bulletin 4-4 - Notes on the Western Elton Mining Field\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20Notes%20on%20the%20Western%20Elton%20Mining%20Field.pdf\" }, { \"title\": \"Bulletin 4-4 - Regional Geochemical Reconnaissance of the Derbyshire Area - A Review\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20Regional%20Geochemical%20Reconnaissance%20of%20the%20Derbyshire%20Area%20-%20A%20Review.pdf\" }, { \"title\": \"Bulletin 4-4 - The Copper and Lead Mines of the Mixon area, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20The%20Copper%20and%20Lead%20Mines%20of%20the%20Mixon%20area,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 4-4 - The Mineral Fields of Derbyshire and Cornwall - A Brief Comparison\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-4%20-%20The%20Mineral%20Fields%20of%20Derbyshire%20and%20Cornwall%20-%20A%20Brief%20Comparison.pdf\" }, { \"title\": \"Bulletin 4-5 - A Letter about Mill Close Mine in 1918\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20A%20Letter%20about%20Mill%20Close%20Mine%20in%201918.pdf\" }, { \"title\": \"Bulletin 4-5 - Bamforth Hole, Stoney Middleton, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Bamforth%20Hole,%20Stoney%20Middleton,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 4-5 - Biographical Notes of Authors on Derbyshire - Richard Watson, 1737-1816\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Biographical%20Notes%20of%20Authors%20on%20Derbyshire%20-%20Richard%20Watson,%201737-1816.pdf\" }, { \"title\": \"Bulletin 4-5 - Copper Smelting in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Copper%20Smelting%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 4-5 - Letter from the Chesterfield Gazette 14th June 1828\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Letter%20from%20the%20Chesterfield%20Gazette%2014th%20June%201828.pdf\" }, { \"title\": \"Bulletin 4-5 - Richard Niness, Mineral Agent, of Warslow in Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Richard%20Niness,%20Mineral%20Agent,%20of%20Warslow%20in%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 4-5 - Some Adits in the Via Gellia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Some%20Adits%20in%20the%20Via%20Gellia.pdf\" }, { \"title\": \"Bulletin 4-5 - The Introduction of the Cupola for Smelting down Lead to Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20The%20Introduction%20of%20the%20Cupola%20for%20Smelting%20down%20Lead%20to%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 4-5 - The Preservation of Mining Remains within the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20The%20Preservation%20of%20Mining%20Remains%20within%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 4-5 - Two Mine Wagons from Alston Moor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-5%20-%20Two%20Mine%20Wagons%20from%20Alston%20Moor.pdf\" }, { \"title\": \"Bulletin 4-6 - Index of Mines, Veins, Soughs etc. to Volume 4\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-6%20-%20Index%20of%20Mines,%20Veins,%20Soughs%20etc.%20to%20Volume%204.pdf\" }, { \"title\": \"Bulletin 4-6 - Some Notes on Underground Photography\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-6%20-%20Some%20Notes%20on%20Underground%20Photography.pdf\" }, { \"title\": \"Bulletin 4-6 - Some Recent Surface and Underground Observations at Magpie Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-6%20-%20Some%20Recent%20Surface%20and%20Underground%20Observations%20at%20Magpie%20Mine.pdf\" }, { \"title\": \"Bulletin 4-6 - The Adit Workings on the North Side of the Via Gellia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-6%20-%20The%20Adit%20Workings%20on%20the%20North%20Side%20of%20the%20Via%20Gellia.pdf\" }, { \"title\": \"Bulletin 4-6 - The Metalliferous Mines of the Weaver Hills, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-6%20-%20The%20Metalliferous%20Mines%20of%20the%20Weaver%20Hills,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 4-6 - The Recovery of a Steam Engine from Putwell Hill Mine, Monsal Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%204-6%20-%20The%20Recovery%20of%20a%20Steam%20Engine%20from%20Putwell%20Hill%20Mine,%20Monsal%20Dale.pdf\" }, { \"title\": \"Bulletin 5-1 - A Survey of Good Luck Mine and Adjacent Levels in the Via Gellia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20A%20Survey%20of%20Good%20Luck%20Mine%20and%20Adjacent%20Levels%20in%20the%20Via%20Gellia.pdf\" }, { \"title\": \"Bulletin 5-1 - Biographical Notes on Derbyshire Authors - Gabriel Jars (1732-1769) and the Derbyshire Lead Industry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20Biographical%20Notes%20on%20Derbyshire%20Authors%20-%20Gabriel%20Jars%20(1732-1769)%20and%20the%20Derbyshire%20Lead%20Industry.pdf\" }, { \"title\": \"Bulletin 5-1 - Lead Smelting Sites at Beeley Moor, Barbrook and Stoneedge - Report of a Field Meeting on 13 November 1971\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20Lead%20Smelting%20Sites%20at%20Beeley%20Moor,%20Barbrook%20and%20Stoneedge%20-%20Report%20of%20a%20Field%20Meeting%20on%2013%20November%201971.pdf\" }, { \"title\": \"Bulletin 5-1 - Magpie Mine and the Bacon Family 1930-1951\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20Magpie%20Mine%20and%20the%20Bacon%20Family%201930-1951.pdf\" }, { \"title\": \"Bulletin 5-1 - Notes on the Lathkill Gold Mine, 1854-1856\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20Notes%20on%20the%20Lathkill%20Gold%20Mine,%201854-1856.pdf\" }, { \"title\": \"Bulletin 5-1 - Putwell Hill Lead Mine, Monsal Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20Putwell%20Hill%20Lead%20Mine,%20Monsal%20Dale.pdf\" }, { \"title\": \"Bulletin 5-1 - Recollections of a Mill Close Miner\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20Recollections%20of%20a%20Mill%20Close%20Miner.pdf\" }, { \"title\": \"Bulletin 5-1 - The Metalliferous Mines of the Weaver Hills, Staffordshire - Part 2 - The Ribden Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20The%20Metalliferous%20Mines%20of%20the%20Weaver%20Hills,%20Staffordshire%20-%20Part%202%20-%20The%20Ribden%20Mines.pdf\" }, { \"title\": \"Bulletin 5-1 - The Royledge and New York Copper Mines, Upper Elkstones, near Leek, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-1%20-%20The%20Royledge%20and%20New%20York%20Copper%20Mines,%20Upper%20Elkstones,%20near%20Leek,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 5-2 - Biographical Notes on Derbyshire Authors - William Adam (1794-1873) and the Gem of the Peak\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-2%20-%20Biographical%20Notes%20on%20Derbyshire%20Authors%20-%20William%20Adam%20(1794-1873)%20and%20the%20Gem%20of%20the%20Peak.pdf\" }, { \"title\": \"Bulletin 5-2 - Eyam Cottage Museum Project\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-2%20-%20Eyam%20Cottage%20Museum%20Project.pdf\" }, { \"title\": \"Bulletin 5-2 - Origins and History of Fire Setting\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-2%20-%20Origins%20and%20History%20of%20Fire%20Setting.pdf\" }, { \"title\": \"Bulletin 5-2 - Parys Mountain Copper Mine, Anglesey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-2%20-%20Parys%20Mountain%20Copper%20Mine,%20Anglesey.pdf\" }, { \"title\": \"Bulletin 5-2 - The Dale Mine, Manifold Valley, North Staffordshire - Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-2%20-%20The%20Dale%20Mine,%20Manifold%20Valley,%20North%20Staffordshire%20-%20Part%201.pdf\" }, { \"title\": \"Bulletin 5-2 - Wapping Mine and Cumberland Cavern, Matlock Bath\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-2%20-%20Wapping%20Mine%20and%20Cumberland%20Cavern,%20Matlock%20Bath.pdf\" }, { \"title\": \"Bulletin 5-3 - Crich Lot and Cope\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20Crich%20Lot%20and%20Cope.pdf\" }, { \"title\": \"Bulletin 5-3 - Folklore and Superstition in Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20Folklore%20and%20Superstition%20in%20Mines.pdf\" }, { \"title\": \"Bulletin 5-3 - Mixon Mine - Level in South Shaft\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20Mixon%20Mine%20-%20Level%20in%20South%20Shaft.pdf\" }, { \"title\": \"Bulletin 5-3 - New Pumps for Old\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20New%20Pumps%20for%20Old.pdf\" }, { \"title\": \"Bulletin 5-3 - Supplementary Notes on the Lead Mines in the Monyash-Flagg Area of Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20Supplementary%20Notes%20on%20the%20Lead%20Mines%20in%20the%20Monyash-Flagg%20Area%20of%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 5-3 - The Dale Mine, Manifold Valley, North Staffordshire - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20The%20Dale%20Mine,%20Manifold%20Valley,%20North%20Staffordshire%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 5-3 - The Mines East of Hoptonwood Quarries, Via Gellia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-3%20-%20The%20Mines%20East%20of%20Hoptonwood%20Quarries,%20Via%20Gellia.pdf\" }, { \"title\": \"Bulletin 5-4 - Goodluck Mine, Via Gellia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-4%20-%20Goodluck%20Mine,%20Via%20Gellia.pdf\" }, { \"title\": \"Bulletin 5-4 - The Mines near Upperwood, Matlock Bath. Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-4%20-%20The%20Mines%20near%20Upperwood,%20Matlock%20Bath.%20Part%201.pdf\" }, { \"title\": \"Bulletin 5-4 - The Watergrove Pumping Engine of 1838\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-4%20-%20The%20Watergrove%20Pumping%20Engine%20of%201838.pdf\" }, { \"title\": \"Bulletin 5-4 - Thoughts on Derbyshire Caves and Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-4%20-%20Thoughts%20on%20Derbyshire%20Caves%20and%20Mines.pdf\" }, { \"title\": \"Bulletin 5-5 - A History of the Bincliff Lead Mines, Wetton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20A%20History%20of%20the%20Bincliff%20Lead%20Mines,%20Wetton.pdf\" }, { \"title\": \"Bulletin 5-5 - Analysis of membership of the Society\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20Analysis%20of%20membership%20of%20the%20Society.pdf\" }, { \"title\": \"Bulletin 5-5 - An Ecological Survey of Mines in Cucklet Delph, Stoney Middleton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20An%20Ecological%20Survey%20of%20Mines%20in%20Cucklet%20Delph,%20Stoney%20Middleton.pdf\" }, { \"title\": \"Bulletin 5-5 - A Preliminary Survey of the Bincliff Lead Mines, Wetton, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20A%20Preliminary%20Survey%20of%20the%20Bincliff%20Lead%20Mines,%20Wetton,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 5-5 - Folksongs of the Peak District Miners - a Letter\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20Folksongs%20of%20the%20Peak%20District%20Miners%20-%20a%20Letter.pdf\" }, { \"title\": \"Bulletin 5-5 - Lead Mining in Cromford Liberty, 1698-1714\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20Lead%20Mining%20in%20Cromford%20Liberty,%201698-1714.pdf\" }, { \"title\": \"Bulletin 5-5 - Lead Poisoning in the Derbyshire Lead Industry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20Lead%20Poisoning%20in%20the%20Derbyshire%20Lead%20Industry.pdf\" }, { \"title\": \"Bulletin 5-5 - Preservation of Mining Relics - Notes for Guidance\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20Preservation%20of%20Mining%20Relics%20-%20Notes%20for%20Guidance.pdf\" }, { \"title\": \"Bulletin 5-5 - The Dale Mine, Manifold Valley, North Staffordshire - Part 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20The%20Dale%20Mine,%20Manifold%20Valley,%20North%20Staffordshire%20-%20Part%203.pdf\" }, { \"title\": \"Bulletin 5-5 - The Lords Cupola, Middleton Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-5%20-%20The%20Lords%20Cupola,%20Middleton%20Dale.pdf\" }, { \"title\": \"Bulletin 5-6 - A Sharpening Stone from a Level on Hassop Common\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20A%20Sharpening%20Stone%20from%20a%20Level%20on%20Hassop%20Common.pdf\" }, { \"title\": \"Bulletin 5-6 - A Survey of a Mine in Tearsall Rough, Wensley\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20A%20Survey%20of%20a%20Mine%20in%20Tearsall%20Rough,%20Wensley.pdf\" }, { \"title\": \"Bulletin 5-6 - A Survey of Maypit and Redsoil Mines, Sheldon\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20A%20Survey%20of%20Maypit%20and%20Redsoil%20Mines,%20Sheldon.pdf\" }, { \"title\": \"Bulletin 5-6 - Biographical Notes - John Whitehurst, 1713-1788\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20Biographical%20Notes%20-%20John%20Whitehurst,%201713-1788.pdf\" }, { \"title\": \"Bulletin 5-6 - Britains Mine's and Manufactories -Celia Fiennes' Observations in 1697-8\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20Britains%20Mine's%20and%20Manufactories%20-Celia%20Fiennes'%20Observations%20in%201697-8.pdf\" }, { \"title\": \"Bulletin 5-6 - Index to Volume 5\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20Index%20to%20Volume%205.pdf\" }, { \"title\": \"Bulletin 5-6 - Notes on Bravoite in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20Notes%20on%20Bravoite%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 5-6 - Recovery of the second Steam Engine from Putwell Hill Mine, Monsal Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20Recovery%20of%20the%20second%20Steam%20Engine%20from%20Putwell%20Hill%20Mine,%20Monsal%20Dale.pdf\" }, { \"title\": \"Bulletin 5-6 - Report on Shaft Capping on Masson Hill, Matlock, June 1974\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20Report%20on%20Shaft%20Capping%20on%20Masson%20Hill,%20Matlock,%20June%201974.pdf\" }, { \"title\": \"Bulletin 5-6 - The Re-opening of the Magpie Sough \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%205-6%20-%20The%20Re-opening%20of%20the%20Magpie%20Sough%20.pdf\" }, { \"title\": \"Bulletin 6-1 - Brightside Mine, Hassop\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Brightside%20Mine,%20Hassop.pdf\" }, { \"title\": \"Bulletin 6-1 - Comments on Redsoil and Magpie\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Comments%20on%20Redsoil%20and%20Magpie.pdf\" }, { \"title\": \"Bulletin 6-1 - Geology of the Blende Vein, Magpie Sough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Geology%20of%20the%20Blende%20Vein,%20Magpie%20Sough.pdf\" }, { \"title\": \"Bulletin 6-1 - Holme Bank Chert Mine, Bakewell\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Holme%20Bank%20Chert%20Mine,%20Bakewell.pdf\" }, { \"title\": \"Bulletin 6-1 - Impressions of visits to Parc Mine, North Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Impressions%20of%20visits%20to%20Parc%20Mine,%20North%20Wales.pdf\" }, { \"title\": \"Bulletin 6-1 - James Croston - On Foot through the Peak\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20James%20Croston%20-%20On%20Foot%20through%20the%20Peak.pdf\" }, { \"title\": \"Bulletin 6-1 - Preservation and Restoration Practices used at Goodluck Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Preservation%20and%20Restoration%20Practices%20used%20at%20Goodluck%20Mine.pdf\" }, { \"title\": \"Bulletin 6-1 - Songs of the Derbyshire Lead Miners\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20Songs%20of%20the%20Derbyshire%20Lead%20Miners.pdf\" }, { \"title\": \"Bulletin 6-1 - The Lead Mines of South East Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-1%20-%20The%20Lead%20Mines%20of%20South%20East%20Wales.pdf\" }, { \"title\": \"Bulletin 6-2 - A Gazetteer of Ironstone Mines in the East Midlands\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20A%20Gazetteer%20of%20Ironstone%20Mines%20in%20the%20East%20Midlands.pdf\" }, { \"title\": \"Bulletin 6-2 - A Survey of the Shafts of Bincliff, Oversetts and Highfields Mine, Wetton, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20A%20Survey%20of%20the%20Shafts%20of%20Bincliff,%20Oversetts%20and%20Highfields%20Mine,%20Wetton,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 6-2 - Lead Mining in Ashover - A Preliminary Survey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Lead%20Mining%20in%20Ashover%20-%20A%20Preliminary%20Survey.pdf\" }, { \"title\": \"Bulletin 6-2 - Notes on some Early Techniques used in Derbyshire Lead Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Notes%20on%20some%20Early%20Techniques%20used%20in%20Derbyshire%20Lead%20Mining.pdf\" }, { \"title\": \"Bulletin 6-2 - Smallpenny Sough, Lathkill Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Smallpenny%20Sough,%20Lathkill%20Dale.pdf\" }, { \"title\": \"Bulletin 6-2 - Stanley Rowlands' Recollections of Magpie Mine in 1924\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Stanley%20Rowlands'%20Recollections%20of%20Magpie%20Mine%20in%201924.pdf\" }, { \"title\": \"Bulletin 6-2 - The Burgoyne Mines at Ecton during the Seventeenth Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20The%20Burgoyne%20Mines%20at%20Ecton%20during%20the%20Seventeenth%20Century.pdf\" }, { \"title\": \"Bulletin 6-2 - The Geology of Magpie Sough and Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20The%20Geology%20of%20Magpie%20Sough%20and%20Mine.pdf\" }, { \"title\": \"Bulletin 6-2 - The Mines of Hassop Common - Part 1\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20The%20Mines%20of%20Hassop%20Common%20-%20Part%201.pdf\" }, { \"title\": \"Bulletin 6-2 - The Washing of Lead Ore in Derbyshire during the Nineteenth Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20The%20Washing%20of%20Lead%20Ore%20in%20Derbyshire%20during%20the%20Nineteenth%20Century.pdf\" }, { \"title\": \"Bulletin 6-2 - Two Roman Pigs of Lead found near Ashbourne\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Two%20Roman%20Pigs%20of%20Lead%20found%20near%20Ashbourne.pdf\" }, { \"title\": \"Bulletin 6-2 - Two Wooden Lead Ore Measuring Dishes\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Two%20Wooden%20Lead%20Ore%20Measuring%20Dishes.pdf\" }, { \"title\": \"Bulletin 6-2 - Unusual Water-powered Engines in the Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-2%20-%20Unusual%20Water-powered%20Engines%20in%20the%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 6-3 - A Great Pig of Lead found near \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20A%20Great%20Pig%20of%20Lead%20found%20near%20.pdf\" }, { \"title\": \"Bulletin 6-3 - Calcutta Pumping Engine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Calcutta%20Pumping%20Engine.pdf\" }, { \"title\": \"Bulletin 6-3 - Comment - Unusual Water-Powered\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Comment%20-%20Unusual%20Water-Powered.pdf\" }, { \"title\": \"Bulletin 6-3 - John Taylor in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20John%20Taylor%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 6-3 - Lead Mining in Ashover\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Lead%20Mining%20in%20Ashover.pdf\" }, { \"title\": \"Bulletin 6-3 - Mandale Forefield Shaft\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Mandale%20Forefield%20Shaft.pdf\" }, { \"title\": \"Bulletin 6-3 - Presentations at the Annual \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Presentations%20at%20the%20Annual%20.pdf\" }, { \"title\": \"Bulletin 6-3 - Review of Mining Potentialities\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Review%20of%20Mining%20Potentialities.pdf\" }, { \"title\": \"Bulletin 6-3 - The Mineral Statistics\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20The%20Mineral%20Statistics.pdf\" }, { \"title\": \"Bulletin 6-3 - The Pretoria and Greenfield \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20The%20Pretoria%20and%20Greenfield%20.pdf\" }, { \"title\": \"Bulletin 6-3 - Visit to Holme Bank Chert Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Visit%20to%20Holme%20Bank%20Chert%20Mine.pdf\" }, { \"title\": \"Bulletin 6-3 - Visit to Parc Mine, North Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-3%20-%20Visit%20to%20Parc%20Mine,%20North%20Wales.pdf\" }, { \"title\": \"Bulletin 6-4 - Discussion - Gypsum in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-4%20-%20Discussion%20-%20Gypsum%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 6-4 - Odin Mine, Castleton, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-4%20-%20Odin%20Mine,%20Castleton,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 6-5 - A Puzzle Painting\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20A%20Puzzle%20Painting.pdf\" }, { \"title\": \"Bulletin 6-5 - Arran Barytes Mine, Glen Sannox, Isle of Arran\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20Arran%20Barytes%20Mine,%20Glen%20Sannox,%20Isle%20of%20Arran.pdf\" }, { \"title\": \"Bulletin 6-5 - A Survey of Little Milldam Mine, Great Hucklow\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20A%20Survey%20of%20Little%20Milldam%20Mine,%20Great%20Hucklow.pdf\" }, { \"title\": \"Bulletin 6-5 - Capital Formation in the Wirksworth Lead Mining Industry - 1700 to 1800\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20Capital%20Formation%20in%20the%20Wirksworth%20Lead%20Mining%20Industry%20-%201700%20to%201800.pdf\" }, { \"title\": \"Bulletin 6-5 - Druid Inn Papers at the National Library of Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20Druid%20Inn%20Papers%20at%20the%20National%20Library%20of%20Wales.pdf\" }, { \"title\": \"Bulletin 6-5 - John Taylor in Derbyshire 1839-1851 - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20John%20Taylor%20in%20Derbyshire%201839-1851%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 6-5 - Mississippi Valley type Orefields in Britain\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20Mississippi%20Valley%20type%20Orefields%20in%20Britain.pdf\" }, { \"title\": \"Bulletin 6-5 - Nicker Grove Mine, Eyam, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20Nicker%20Grove%20Mine,%20Eyam,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 6-5 - Peak District Mine Names - A Preliminary Survey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20Peak%20District%20Mine%20Names%20-%20A%20Preliminary%20Survey.pdf\" }, { \"title\": \"Bulletin 6-5 - The Lathkill Miner\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20The%20Lathkill%20Miner.pdf\" }, { \"title\": \"Bulletin 6-5 - The Recovery of the Wills Founder Water Pressure Engine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-5%20-%20The%20Recovery%20of%20the%20Wills%20Founder%20Water%20Pressure%20Engine.pdf\" }, { \"title\": \"Bulletin 6-6 - Gank Hole Mine, Lathkill Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20Gank%20Hole%20Mine,%20Lathkill%20Dale.pdf\" }, { \"title\": \"Bulletin 6-6 - Index of Veins and Mines in Volume 6\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20Index%20of%20Veins%20and%20Mines%20in%20Volume%206.pdf\" }, { \"title\": \"Bulletin 6-6 - Merry Tom Vein, Middleton-by-Wirksworth, A Supplementary Note\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20Merry%20Tom%20Vein,%20Middleton-by-Wirksworth,%20A%20Supplementary%20Note.pdf\" }, { \"title\": \"Bulletin 6-6 - Mines in the Slingtor Wood Area, Cromford\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20Mines%20in%20the%20Slingtor%20Wood%20Area,%20Cromford.pdf\" }, { \"title\": \"Bulletin 6-6 - The Barmoot Court, Wirksworth, 1977\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20The%20Barmoot%20Court,%20Wirksworth,%201977.pdf\" }, { \"title\": \"Bulletin 6-6 - The Castleton Field Meeting, April 1977\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20The%20Castleton%20Field%20Meeting,%20April%201977.pdf\" }, { \"title\": \"Bulletin 6-6 - The Geology of the Wills Founder Engine Shaft, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20The%20Geology%20of%20the%20Wills%20Founder%20Engine%20Shaft,%20Winster.pdf\" }, { \"title\": \"Bulletin 6-6 - The Liberties of Grindlow and Foolow, August 1977\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20The%20Liberties%20of%20Grindlow%20and%20Foolow,%20August%201977.pdf\" }, { \"title\": \"Bulletin 6-6 - To Remove or Not to Remove\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20To%20Remove%20or%20Not%20to%20Remove.pdf\" }, { \"title\": \"Bulletin 6-6 - William Bray's Sketch of a Tour into Derbyshire and Yorkshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20William%20Bray's%20Sketch%20of%20a%20Tour%20into%20Derbyshire%20and%20Yorkshire.pdf\" }, { \"title\": \"Bulletin 6-6 - Wind, Water and Steam Power on Derbyshire Lead Mines - a List\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%206-6%20-%20Wind,%20Water%20and%20Steam%20Power%20on%20Derbyshire%20Lead%20Mines%20-%20a%20List.pdf\" }, { \"title\": \"Bulletin 7-1 - A Pennine Model for the Diagenetic Origin of Base-Metal Ore Deposits in Britain\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20A%20Pennine%20Model%20for%20the%20Diagenetic%20Origin%20of%20Base-Metal%20Ore%20Deposits%20in%20Britain.pdf\" }, { \"title\": \"Bulletin 7-1 - Capital Formation in the Wirksworth Lead Mining Industry - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20Capital%20Formation%20in%20the%20Wirksworth%20Lead%20Mining%20Industry%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 7-1 - John Burton's Mining Jug\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20John%20Burton's%20Mining%20Jug.pdf\" }, { \"title\": \"Bulletin 7-1 - The Activities of the London Lead Companies in Wirksworth - A Brief Summary\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20The%20Activities%20of%20the%20London%20Lead%20Companies%20in%20Wirksworth%20-%20A%20Brief%20Summary.pdf\" }, { \"title\": \"Bulletin 7-1 - The Ballad of the Great Barmote Court\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20The%20Ballad%20of%20the%20Great%20Barmote%20Court.pdf\" }, { \"title\": \"Bulletin 7-1 - The Geology and Exploration of the Hubbadale Mines, Taddington\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20The%20Geology%20and%20Exploration%20of%20the%20Hubbadale%20Mines,%20Taddington.pdf\" }, { \"title\": \"Bulletin 7-1 - The Inquisition or Quo Warrento of 1288\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20The%20Inquisition%20or%20Quo%20Warrento%20of%201288.pdf\" }, { \"title\": \"Bulletin 7-1 - Things to Do\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1%20-%20Things%20to%20Do.pdf\" }, { \"title\": \"Bulletin 7-1- Review - The Wooley Manuscripts\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-1-%20Review%20-%20The%20Wooley%20Manuscripts.pdf\" }, { \"title\": \"Bulletin 7-2 - Anecdotes on Mill Close Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20Anecdotes%20on%20Mill%20Close%20Mine.pdf\" }, { \"title\": \"Bulletin 7-2 - A Visit to Blobber Mine, Wirksworth, in the 1920s\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20A%20Visit%20to%20Blobber%20Mine,%20Wirksworth,%20in%20the%201920s.pdf\" }, { \"title\": \"Bulletin 7-2 - Hubberdale Mine and Associated Veins 1836 to 1848\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20Hubberdale%20Mine%20and%20Associated%20Veins%201836%20to%201848.pdf\" }, { \"title\": \"Bulletin 7-2 - The Ashbourne Inquisition of 1288- A Reply\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20The%20Ashbourne%20Inquisition%20of%201288-%20A%20Reply.pdf\" }, { \"title\": \"Bulletin 7-2 - The Caves, Mines and Soughs of the Wardlow Basin and Cressbrook Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20The%20Caves,%20Mines%20and%20Soughs%20of%20the%20Wardlow%20Basin%20and%20Cressbrook%20Dale.pdf\" }, { \"title\": \"Bulletin 7-2 - The Exploration of Wills Founder Mine, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20The%20Exploration%20of%20Wills%20Founder%20Mine,%20Winster.pdf\" }, { \"title\": \"Bulletin 7-2 - The Extravaganza or Introductory Weekend 29 April to 1 May 1978\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20The%20Extravaganza%20or%20Introductory%20Weekend%2029%20April%20to%201%20May%201978.pdf\" }, { \"title\": \"Bulletin 7-2 - Two Cardiganshire Lead Mines - Caegynon and Rheidol United\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-2%20-%20Two%20Cardiganshire%20Lead%20Mines%20-%20Caegynon%20and%20Rheidol%20United.pdf\" }, { \"title\": \"Bulletin 7-3 - Review - Industrial Geology by J.L. Knill\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20Review%20-%20Industrial%20Geology%20by%20J.L.%20Knill.pdf\" }, { \"title\": \"Bulletin 7-3 - Technical Development in Derbyshire Lead Mining, 1700-1880\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20Technical%20Development%20in%20Derbyshire%20Lead%20Mining,%201700-1880.pdf\" }, { \"title\": \"Bulletin 7-3 - The Coal Mines of the Flockton Area near Horbury, West Yorkshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20The%20Coal%20Mines%20of%20the%20Flockton%20Area%20near%20Horbury,%20West%20Yorkshire.pdf\" }, { \"title\": \"Bulletin 7-3 - The Engines at Mill Close Mine - 1920 to 1939\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20The%20Engines%20at%20Mill%20Close%20Mine%20-%201920%20to%201939.pdf\" }, { \"title\": \"Bulletin 7-3 - The Extent of Belland Ground adjacent to Tideslow and Maiden Rakes - Little Hucklow\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20The%20Extent%20of%20Belland%20Ground%20adjacent%20to%20Tideslow%20and%20Maiden%20Rakes%20-%20Little%20Hucklow.pdf\" }, { \"title\": \"Bulletin 7-3 - The Warl Gate Extension in Goodluck Mine, Via Gellia, Cromford, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20The%20Warl%20Gate%20Extension%20in%20Goodluck%20Mine,%20Via%20Gellia,%20Cromford,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 7-3 - The Winster Earth Tremors\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-3%20-%20The%20Winster%20Earth%20Tremors.pdf\" }, { \"title\": \"Bulletin 7-4 - A Geological Outline of the Ecton Copper Mines, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20A%20Geological%20Outline%20of%20the%20Ecton%20Copper%20Mines,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 7-4 - An Attempt to Save the Snailbeach Mining Area from Land Reclamation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20An%20Attempt%20to%20Save%20the%20Snailbeach%20Mining%20Area%20from%20Land%20Reclamation.pdf\" }, { \"title\": \"Bulletin 7-4 - CCTV Inspection of Yatestoop Mine Shaft\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20CCTV%20Inspection%20of%20Yatestoop%20Mine%20Shaft.pdf\" }, { \"title\": \"Bulletin 7-4 - Exploring Underground History the Easy Way - Using Modern Methods to Find Ancient Engine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20Exploring%20Underground%20History%20the%20Easy%20Way%20-%20Using%20Modern%20Methods%20to%20Find%20Ancient%20Engine.pdf\" }, { \"title\": \"Bulletin 7-4 - Meets Report - West Yorkshire Collieries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20Meets%20Report%20-%20West%20Yorkshire%20Collieries.pdf\" }, { \"title\": \"Bulletin 7-4 - Mining Remains in the Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20Mining%20Remains%20in%20the%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 7-4 - Miss Nellie Kirkham (Mrs. J.H.D. Myatt) - An Obituary\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20Miss%20Nellie%20Kirkham%20(Mrs.%20J.H.D.%20Myatt)%20-%20An%20Obituary.pdf\" }, { \"title\": \"Bulletin 7-4 - The Clay Vein Extension in Goodluck Mine, Via Gellia, Cromford, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20The%20Clay%20Vein%20Extension%20in%20Goodluck%20Mine,%20Via%20Gellia,%20Cromford,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 7-4 - The Recovery of the Pumps from Wills Founder Shaft, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20The%20Recovery%20of%20the%20Pumps%20from%20Wills%20Founder%20Shaft,%20Winster.pdf\" }, { \"title\": \"Bulletin 7-4 - Walton Colliery, Wakefield, West Yorkshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-4%20-%20Walton%20Colliery,%20Wakefield,%20West%20Yorkshire.pdf\" }, { \"title\": \"Bulletin 7-5 - The Artificial Drainage of the Wirksworth-Cromford Area\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-5%20-%20The%20Artificial%20Drainage%20of%20the%20Wirksworth-Cromford%20Area.pdf\" }, { \"title\": \"Bulletin 7-5 - The Earliest Lead-Mine Soughs in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-5%20-%20The%20Earliest%20Lead-Mine%20Soughs%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 7-6 - An Account of a Visit by John Rennie to Peak Cavern\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20An%20Account%20of%20a%20Visit%20by%20John%20Rennie%20to%20Peak%20Cavern.pdf\" }, { \"title\": \"Bulletin 7-6 - A Note on the Anglo-Saxon Lead Industry of the Peak\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20A%20Note%20on%20the%20Anglo-Saxon%20Lead%20Industry%20of%20the%20Peak.pdf\" }, { \"title\": \"Bulletin 7-6 - A Survey and the Geology of Putwell Hill Mine, Monsal Dale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20A%20Survey%20and%20the%20Geology%20of%20Putwell%20Hill%20Mine,%20Monsal%20Dale.pdf\" }, { \"title\": \"Bulletin 7-6 - A Wirksworth Mine Agent's Letter\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20A%20Wirksworth%20Mine%20Agent's%20Letter.pdf\" }, { \"title\": \"Bulletin 7-6 - Clear-the-Way or Black Hillock Mine, Tideslow Moor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20Clear-the-Way%20or%20Black%20Hillock%20Mine,%20Tideslow%20Moor.pdf\" }, { \"title\": \"Bulletin 7-6 - Index of Mines and Related Places in Volume 7\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20Index%20of%20Mines%20and%20Related%20Places%20in%20Volume%207.pdf\" }, { \"title\": \"Bulletin 7-6 - Memoranda Concerning the Broadmeadow and Wheels Rake Mines, Alport\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20Memoranda%20Concerning%20the%20Broadmeadow%20and%20Wheels%20Rake%20Mines,%20Alport.pdf\" }, { \"title\": \"Bulletin 7-6 - Mineralization within the Igneous Rocks of the South Pennine Orefield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20Mineralization%20within%20the%20Igneous%20Rocks%20of%20the%20South%20Pennine%20Orefield.pdf\" }, { \"title\": \"Bulletin 7-6 - Snake Mine - Some Recent Findings\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20Snake%20Mine%20-%20Some%20Recent%20Findings.pdf\" }, { \"title\": \"Bulletin 7-6 - The Geology of Hallicar Wood Adit, Via Gellia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%207-6%20-%20The%20Geology%20of%20Hallicar%20Wood%20Adit,%20Via%20Gellia.pdf\" }, { \"title\": \"Bulletin 8-1 - Dig in the Level at Groaning Tor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20Dig%20in%20the%20Level%20at%20Groaning%20Tor.pdf\" }, { \"title\": \"Bulletin 8-1 - Exploration of Fritchley Sough and Old End Mine, Crich\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20Exploration%20of%20Fritchley%20Sough%20and%20Old%20End%20Mine,%20Crich.pdf\" }, { \"title\": \"Bulletin 8-1 - Harold Sarjeant 1906-1980\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20Harold%20Sarjeant%201906-1980.pdf\" }, { \"title\": \"Bulletin 8-1 - Recollections of a Laxey Miner\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20Recollections%20of%20a%20Laxey%20Miner.pdf\" }, { \"title\": \"Bulletin 8-1 - Sir Hugh Myddelton The First Mines Adventurer\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20Sir%20Hugh%20Myddelton%20The%20First%20Mines%20Adventurer.pdf\" }, { \"title\": \"Bulletin 8-1 - The Drainage of the Alport Mining Field \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20The%20Drainage%20of%20the%20Alport%20Mining%20Field%20.pdf\" }, { \"title\": \"Bulletin 8-1 - The Eardistion Copper Mine, Shropshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-1%20-%20The%20Eardistion%20Copper%20Mine,%20Shropshire.pdf\" }, { \"title\": \"Bulletin 8-2 - A Survey of the Masson Cave-cum-Mine Complex, Matlock\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-2%20-%20A%20Survey%20of%20the%20Masson%20Cave-cum-Mine%20Complex,%20Matlock.pdf\" }, { \"title\": \"Bulletin 8-2 - Ringing Rake and Masson Soughs and the mines on the East Side of Masson Hill, Matlock\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-2%20-%20Ringing%20Rake%20and%20Masson%20Soughs%20and%20the%20mines%20on%20the%20East%20Side%20of%20Masson%20Hill,%20Matlock.pdf\" }, { \"title\": \"Bulletin 8-2 - The Development of Mining and Drainage in the Wensley, Winster and Elton areas\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-2%20-%20The%20Development%20of%20Mining%20and%20Drainage%20in%20the%20Wensley,%20Winster%20and%20Elton%20areas.pdf\" }, { \"title\": \"Bulletin 8-3 - A Few Notes on the Jingler Site, Wakebridge, Crich\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20A%20Few%20Notes%20on%20the%20Jingler%20Site,%20Wakebridge,%20Crich.pdf\" }, { \"title\": \"Bulletin 8-3 - Belland Ground in the South Pennines - Causes and Alleviations\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20Belland%20Ground%20in%20the%20South%20Pennines%20-%20Causes%20and%20Alleviations.pdf\" }, { \"title\": \"Bulletin 8-3 - Bwlch Glas Lead Mine, Cardiganshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20Bwlch%20Glas%20Lead%20Mine,%20Cardiganshire.pdf\" }, { \"title\": \"Bulletin 8-3 - John Fairburn - Stationer and Mining Entrepreneur\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20John%20Fairburn%20-%20Stationer%20and%20Mining%20Entrepreneur.pdf\" }, { \"title\": \"Bulletin 8-3 - Mawstone Mine, Youlgreave\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20Mawstone%20Mine,%20Youlgreave.pdf\" }, { \"title\": \"Bulletin 8-3 - Mining History in the Making\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20Mining%20History%20in%20the%20Making.pdf\" }, { \"title\": \"Bulletin 8-3 - Ratchwood Founder Shaft, Wirksworth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20Ratchwood%20Founder%20Shaft,%20Wirksworth.pdf\" }, { \"title\": \"Bulletin 8-3 - The Early Lead Industry and the Ancient Demesne of the Peak\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20The%20Early%20Lead%20Industry%20and%20the%20Ancient%20Demesne%20of%20the%20Peak.pdf\" }, { \"title\": \"Bulletin 8-3 - The Mawstone Mine Tragedy of 1932\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20The%20Mawstone%20Mine%20Tragedy%20of%201932.pdf\" }, { \"title\": \"Bulletin 8-3 - The Origin of the Barmote Court System - A New Theory\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-3%20-%20The%20Origin%20of%20the%20Barmote%20Court%20System%20-%20A%20New%20Theory.pdf\" }, { \"title\": \"Bulletin 8-4 - Ancient Mining in the Udaipur District of Rajasthan, India\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-4%20-%20Ancient%20Mining%20in%20the%20Udaipur%20District%20of%20Rajasthan,%20India.pdf\" }, { \"title\": \"Bulletin 8-4 - An Historical Account of Middlepeak Mine and the northern Part of Ratchwood Title, Wirksworth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-4%20-%20An%20Historical%20Account%20of%20Middlepeak%20Mine%20and%20the%20northern%20Part%20of%20Ratchwood%20Title,%20Wirksworth.pdf\" }, { \"title\": \"Bulletin 8-4 - Examination and Survey of Bage Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-4%20-%20Examination%20and%20Survey%20of%20Bage%20Mine.pdf\" }, { \"title\": \"Bulletin 8-4 - Mineralogy of Bage Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-4%20-%20Mineralogy%20of%20Bage%20Mine.pdf\" }, { \"title\": \"Bulletin 8-4 - Watts Shaft Engine House, Old Millclose Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-4%20-%20Watts%20Shaft%20Engine%20House,%20Old%20Millclose%20Mine.pdf\" }, { \"title\": \"Bulletin 8-5 - Cromford Sough and the Early Use of Gunpowder\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-5%20-%20Cromford%20Sough%20and%20the%20Early%20Use%20of%20Gunpowder.pdf\" }, { \"title\": \"Bulletin 8-5 - Pilkington's Cavern, Castleton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-5%20-%20Pilkington's%20Cavern,%20Castleton.pdf\" }, { \"title\": \"Bulletin 8-5 - The Slack Family - Brassington Lead Miners\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-5%20-%20The%20Slack%20Family%20-%20Brassington%20Lead%20Miners.pdf\" }, { \"title\": \"Bulletin 8-5 - The Steam Engines of Gregory Mine, Ashover\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-5%20-%20The%20Steam%20Engines%20of%20Gregory%20Mine,%20Ashover.pdf\" }, { \"title\": \"Bulletin 8-6 - Cromford Sough Photos\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-6%20-%20Cromford%20Sough%20Photos.pdf\" }, { \"title\": \"Bulletin 8-6 - Evolution of the South Pennine Orefield - 1. Regional Distribution of the Major Non-Metallic Minerals\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-6%20-%20Evolution%20of%20the%20South%20Pennine%20Orefield%20-%201.%20Regional%20Distribution%20of%20the%20Major%20Non-Metallic%20Minerals.pdf\" }, { \"title\": \"Bulletin 8-6 - Exploration and Survey of Great Laxey Mine, Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-6%20-%20Exploration%20and%20Survey%20of%20Great%20Laxey%20Mine,%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 8-6 - Index to Volume 8\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-6%20-%20Index%20to%20Volume%208.pdf\" }, { \"title\": \"Bulletin 8-6 - The Barker Family and Wyatt Lead Mining Businesses, 1730 to 1875\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%208-6%20-%20The%20Barker%20Family%20and%20Wyatt%20Lead%20Mining%20Businesses,%201730%20to%201875.pdf\" }, { \"title\": \"Bulletin 9-1 - The History and Workings of the Nenthead Mines, Cumbria\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-1%20-%20The%20History%20and%20Workings%20of%20the%20Nenthead%20Mines,%20Cumbria.pdf\" }, { \"title\": \"Bulletin 9-2 - Derbyshire Lead Mining and Early Geological Concepts\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-2%20-%20Derbyshire%20Lead%20Mining%20and%20Early%20Geological%20Concepts.pdf\" }, { \"title\": \"Bulletin 9-2 - Evolution of the South Pennine Orefield 2 - Mineral Associations\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-2%20-%20Evolution%20of%20the%20South%20Pennine%20Orefield%202%20-%20Mineral%20Associations.pdf\" }, { \"title\": \"Bulletin 9-2 - Mouldridge Mine, Pikehall, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-2%20-%20Mouldridge%20Mine,%20Pikehall,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 9-2 - The Pumps at Millclose Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-2%20-%20The%20Pumps%20at%20Millclose%20Mine.pdf\" }, { \"title\": \"Bulletin 9-2 - Two Old Miners\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-2%20-%20Two%20Old%20Miners.pdf\" }, { \"title\": \"Bulletin 9-3 - A Trial Excavation on High Tor Rake, Matlock\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-3%20-%20A%20Trial%20Excavation%20on%20High%20Tor%20Rake,%20Matlock.pdf\" }, { \"title\": \"Bulletin 9-3 - Brassington Mining, 1792 to 1826\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-3%20-%20Brassington%20Mining,%201792%20to%201826.pdf\" }, { \"title\": \"Bulletin 9-3 - Jacob Momma and the Ecton Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-3%20-%20Jacob%20Momma%20and%20the%20Ecton%20Mines.pdf\" }, { \"title\": \"Bulletin 9-3 - Letter to the Chesterfield Gazette\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-3%20-%20Letter%20to%20the%20Chesterfield%20Gazette.pdf\" }, { \"title\": \"Bulletin 9-3 - Peakshole Sough, Castleton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-3%20-%20Peakshole%20Sough,%20Castleton.pdf\" }, { \"title\": \"Bulletin 9-3 - The Mining History of Speedwell Mine or Oakden Level, Castleton, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-3%20-%20The%20Mining%20History%20of%20Speedwell%20Mine%20or%20Oakden%20Level,%20Castleton,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 9-4 - A History of Mining on Sark and Herm, Channel Islands\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-4%20-%20A%20History%20of%20Mining%20on%20Sark%20and%20Herm,%20Channel%20Islands.pdf\" }, { \"title\": \"Bulletin 9-4 - Eightennth Century Lead Ingots from the Hollandia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-4%20-%20Eightennth%20Century%20Lead%20Ingots%20from%20the%20Hollandia.pdf\" }, { \"title\": \"Bulletin 9-4 - Recollections of Mill Close Mine, South Darley, near Matlock\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-4%20-%20Recollections%20of%20Mill%20Close%20Mine,%20South%20Darley,%20near%20Matlock.pdf\" }, { \"title\": \"Bulletin 9-5 - Brittania or Snowdon Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-5%20-%20Brittania%20or%20Snowdon%20Mine.pdf\" }, { \"title\": \"Bulletin 9-5 - Prosperity and Decline in Derbyshire Lead Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-5%20-%20Prosperity%20and%20Decline%20in%20Derbyshire%20Lead%20Mining.pdf\" }, { \"title\": \"Bulletin 9-5 - The Great Laxey Winding Engine, Great Laxey Mine, Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-5%20-%20The%20Great%20Laxey%20Winding%20Engine,%20Great%20Laxey%20Mine,%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 9-5 - The Washing Floor at Killhope Lead Mine, Co. Durham - An Interim Report\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-5%20-%20The%20Washing%20Floor%20at%20Killhope%20Lead%20Mine,%20Co.%20Durham%20-%20An%20Interim%20Report.pdf\" }, { \"title\": \"Bulletin 9-6 - A Survey of Beech Cave, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-6%20-%20A%20Survey%20of%20Beech%20Cave,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 9-6 - Cwm Bychan or Nantmor Mine, North Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-6%20-%20Cwm%20Bychan%20or%20Nantmor%20Mine,%20North%20Wales.pdf\" }, { \"title\": \"Bulletin 9-6 - Index Volume 9\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-6%20-%20Index%20Volume%209.pdf\" }, { \"title\": \"Bulletin 9-6 - Kent Hill Gravel Mine and Quarry, Audley, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-6%20-%20Kent%20Hill%20Gravel%20Mine%20and%20Quarry,%20Audley,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 9-6 - Mineralization and Stress History in North Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-6%20-%20Mineralization%20and%20Stress%20History%20in%20North%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 9-6 - Some British Ideas about Ore Genesis from Hooke to Whitehurst 1688 to 1786\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%209-6%20-%20Some%20British%20Ideas%20about%20Ore%20Genesis%20from%20Hooke%20to%20Whitehurst%201688%20to%201786.pdf\" }, { \"title\": \"Bulletin 10-1 - A Personal Memoir of Millclose Mine in 1939\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20A%20Personal%20Memoir%20of%20Millclose%20Mine%20in%201939.pdf\" }, { \"title\": \"Bulletin 10-1 - Barber Fields Coal Drift Workings, Ringinglow, Sheffield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20Barber%20Fields%20Coal%20Drift%20Workings,%20Ringinglow,%20Sheffield.pdf\" }, { \"title\": \"Bulletin 10-1 - Further Comments about Great Laxey Winding Engine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20Further%20Comments%20about%20Great%20Laxey%20Winding%20Engine.pdf\" }, { \"title\": \"Bulletin 10-1 - Great Rake Mine in the 1920's - Recalled by Joe Gould\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20Great%20Rake%20Mine%20in%20the%201920's%20-%20Recalled%20by%20Joe%20Gould.pdf\" }, { \"title\": \"Bulletin 10-1 - Hopping Mine, Upperwood, Matlock Bath\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20Hopping%20Mine,%20Upperwood,%20Matlock%20Bath.pdf\" }, { \"title\": \"Bulletin 10-1 - John Allen, Miner, on Board H.M.S. Investigator, 1801 to 1804\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20John%20Allen,%20Miner,%20on%20Board%20H.M.S.%20Investigator,%201801%20to%201804.pdf\" }, { \"title\": \"Bulletin 10-1 - John Burton of Bonsall, Derbyshire and Iowa, U.S.A. 1795 to 1854\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20John%20Burton%20of%20Bonsall,%20Derbyshire%20and%20Iowa,%20U.S.A.%201795%20to%201854.pdf\" }, { \"title\": \"Bulletin 10-1 - Ringing Rake, Old Jant Mine and Gentlewomen's Pipes and the Masson Deposits, Matlock Bath\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-1%20-%20Ringing%20Rake,%20Old%20Jant%20Mine%20and%20Gentlewomen's%20Pipes%20and%20the%20Masson%20Deposits,%20Matlock%20Bath.pdf\" }, { \"title\": \"Bulletin 10-2 - Ancient Zinc-Lead-Silver Mining in Rajasthan, India - Interim Report\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-2%20-%20Ancient%20Zinc-Lead-Silver%20Mining%20in%20Rajasthan,%20India%20-%20Interim%20Report.pdf\" }, { \"title\": \"Bulletin 10-2 - Dane Bower Colliery, Wildboarclough, Cheshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-2%20-%20Dane%20Bower%20Colliery,%20Wildboarclough,%20Cheshire.pdf\" }, { \"title\": \"Bulletin 10-2 - The Building of the Laxey Wheel\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-2%20-%20The%20Building%20of%20the%20Laxey%20Wheel.pdf\" }, { \"title\": \"Bulletin 10-3 - Evidence of Prehistoric Mining on Copa Hill, Cwmystwyth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20Evidence%20of%20Prehistoric%20Mining%20on%20Copa%20Hill,%20Cwmystwyth.pdf\" }, { \"title\": \"Bulletin 10-3 - Mining and Tourism in California\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20Mining%20and%20Tourism%20in%20California.pdf\" }, { \"title\": \"Bulletin 10-3 - Providence Mine, the Kursaal and the 1981 Derbyshire Act\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20Providence%20Mine,%20the%20Kursaal%20and%20the%201981%20Derbyshire%20Act.pdf\" }, { \"title\": \"Bulletin 10-3 - Stone Hammers and Fire-Setting - A Preliminary Experiment at Cwmystwyth Mine, Dyfed\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20Stone%20Hammers%20and%20Fire-Setting%20-%20A%20Preliminary%20Experiment%20at%20Cwmystwyth%20Mine,%20Dyfed.pdf\" }, { \"title\": \"Bulletin 10-3 - The Barmoot Court at Wirksworth, 20th April 1988\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20The%20Barmoot%20Court%20at%20Wirksworth,%2020th%20April%201988.pdf\" }, { \"title\": \"Bulletin 10-3 - The Cliffs - Quarry and Caves, Little Haywood, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20The%20Cliffs%20-%20Quarry%20and%20Caves,%20Little%20Haywood,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 10-3 - The Working of the Derbyshire Lead Mining Customs in the 18th and 19th Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-3%20-%20The%20Working%20of%20the%20Derbyshire%20Lead%20Mining%20Customs%20in%20the%2018th%20and%2019th%20Centuries.pdf\" }, { \"title\": \"Bulletin 10-4 - A Survey of Lead Mining in Wirksworth Wapentake in 1650\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20A%20Survey%20of%20Lead%20Mining%20in%20Wirksworth%20Wapentake%20in%201650.pdf\" }, { \"title\": \"Bulletin 10-4 - Mining District Rules - Popular Law Making in the American Frontier\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20Mining%20District%20Rules%20-%20Popular%20Law%20Making%20in%20the%20American%20Frontier.pdf\" }, { \"title\": \"Bulletin 10-4 - Notes on the Development of Modern Mining Legislation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20Notes%20on%20the%20Development%20of%20Modern%20Mining%20Legislation.pdf\" }, { \"title\": \"Bulletin 10-4 - Opening Remarks by the Chairman\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20Opening%20Remarks%20by%20the%20Chairman.pdf\" }, { \"title\": \"Bulletin 10-4 - Roman Mining Law\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20Roman%20Mining%20Law.pdf\" }, { \"title\": \"Bulletin 10-4 - Stannary Law\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20Stannary%20Law.pdf\" }, { \"title\": \"Bulletin 10-4 - The Extralateral Right in the United States\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20The%20Extralateral%20Right%20in%20the%20United%20States.pdf\" }, { \"title\": \"Bulletin 10-4 - The First German Mining Laws and the Archaeological Evidence\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20The%20First%20German%20Mining%20Laws%20and%20the%20Archaeological%20Evidence.pdf\" }, { \"title\": \"Bulletin 10-4 - The History of Customary Mining Law at Grassington\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20The%20History%20of%20Customary%20Mining%20Law%20at%20Grassington.pdf\" }, { \"title\": \"Bulletin 10-4 - The Mining Ordinances of New Spain - A Study of Colonial Administration of the Mining Industry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20The%20Mining%20Ordinances%20of%20New%20Spain%20-%20A%20Study%20of%20Colonial%20Administration%20of%20the%20Mining%20Industry.pdf\" }, { \"title\": \"Bulletin 10-4 - The Quo Waranto - A New Translation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20The%20Quo%20Waranto%20-%20A%20New%20Translation.pdf\" }, { \"title\": \"Bulletin 10-4 - Thoughts on Mining Law History\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-4%20-%20Thoughts%20on%20Mining%20Law%20History.pdf\" }, { \"title\": \"Bulletin 10-5 - A Grooved Stone Hammer from Alderley Edge\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20A%20Grooved%20Stone%20Hammer%20from%20Alderley%20Edge.pdf\" }, { \"title\": \"Bulletin 10-5 - Calver Mill\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20Calver%20Mill.pdf\" }, { \"title\": \"Bulletin 10-5 - Evidence of Ancient Copper Mining at Engine Vein, Alderley Edge\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20Evidence%20of%20Ancient%20Copper%20Mining%20at%20Engine%20Vein,%20Alderley%20Edge.pdf\" }, { \"title\": \"Bulletin 10-5 - Extralateral Rights and the Derbyshire Customs\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20Extralateral%20Rights%20and%20the%20Derbyshire%20Customs.pdf\" }, { \"title\": \"Bulletin 10-5 - Mining and Tourism in Arizona\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20Mining%20and%20Tourism%20in%20Arizona.pdf\" }, { \"title\": \"Bulletin 10-5 - Prehistoric Mining Hammers from Bradda Head, Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20Prehistoric%20Mining%20Hammers%20from%20Bradda%20Head,%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 10-5 - The Economics of Lead Mining in 16th and 17th Century Brassington\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20The%20Economics%20of%20Lead%20Mining%20in%2016th%20and%2017th%20Century%20Brassington.pdf\" }, { \"title\": \"Bulletin 10-5 - The Search for Iron, Lead and Gold in Douglas Bay, Isle of Man \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20The%20Search%20for%20Iron,%20Lead%20and%20Gold%20in%20Douglas%20Bay,%20Isle%20of%20Man%20.pdf\" }, { \"title\": \"Bulletin 10-5 - Voyage Metallurgique en Angleterre\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-5%20-%20Voyage%20Metallurgique%20en%20Angleterre.pdf\" }, { \"title\": \"Bulletin 10-6 - Index to Volume 10\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20Index%20to%20Volume%2010.pdf\" }, { \"title\": \"Bulletin 10-6 - Letter - Calver Mill\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20Letter%20-%20Calver%20Mill.pdf\" }, { \"title\": \"Bulletin 10-6 - Letter - Extra-Lateral Rights and the Derbyshire Diffusionists\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20Letter%20-%20Extra-Lateral%20Rights%20and%20the%20Derbyshire%20Diffusionists.pdf\" }, { \"title\": \"Bulletin 10-6 - Letter - Quo Warento\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20Letter%20-%20Quo%20Warento.pdf\" }, { \"title\": \"Bulletin 10-6 - The Comparative Archaeology of Tin and Lead Dressing in Britain during the Nineteenth Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20The%20Comparative%20Archaeology%20of%20Tin%20and%20Lead%20Dressing%20in%20Britain%20during%20the%20Nineteenth%20Century.pdf\" }, { \"title\": \"Bulletin 10-6 - The Hafod-y-Porth Copper Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20The%20Hafod-y-Porth%20Copper%20Mine.pdf\" }, { \"title\": \"Bulletin 10-6 - The World Museum of Mining, Butte, Montana\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2010-6%20-%20The%20World%20Museum%20of%20Mining,%20Butte,%20Montana.pdf\" }, { \"title\": \"Bulletin 11-1 - Bell Hole - The History and Geology of a Small Lead Mine near Foxdale, Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Bell%20Hole%20-%20The%20History%20and%20Geology%20of%20a%20Small%20Lead%20Mine%20near%20Foxdale,%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 11-1 - Derbyshire Lead Smelting in the Eighteenth and Nineteenth Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Derbyshire%20Lead%20Smelting%20in%20the%20Eighteenth%20and%20Nineteenth%20Centuries.pdf\" }, { \"title\": \"Bulletin 11-1 - Exploration of Cromford Moor Mine, Steeple Grange, Wirksworth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Exploration%20of%20Cromford%20Moor%20Mine,%20Steeple%20Grange,%20Wirksworth.pdf\" }, { \"title\": \"Bulletin 11-1 - Letter- Diffusion and Determinism\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Letter-%20Diffusion%20and%20Determinism.pdf\" }, { \"title\": \"Bulletin 11-1 - Letter- Iron, Lead and Gold in Douglas Bay\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Letter-%20Iron,%20Lead%20and%20Gold%20in%20Douglas%20Bay.pdf\" }, { \"title\": \"Bulletin 11-1 - Mining and Tourism in Colorado, U.S.A.\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Mining%20and%20Tourism%20in%20Colorado,%20U.S.A..pdf\" }, { \"title\": \"Bulletin 11-1 - Pyromorphite - A Secondary Lead Mineral\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Pyromorphite%20-%20A%20Secondary%20Lead%20Mineral.pdf\" }, { \"title\": \"Bulletin 11-1 - The Mines at Campiglia Marittima, Livorno, Italy\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20The%20Mines%20at%20Campiglia%20Marittima,%20Livorno,%20Italy.pdf\" }, { \"title\": \"Bulletin 11-1 - Three Eighteenth Centuryt Mining Disputes at Grassington, Yorkshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-1%20-%20Three%20Eighteenth%20Centuryt%20Mining%20Disputes%20at%20Grassington,%20Yorkshire.pdf\" }, { \"title\": \"Bulletin 11-2 - Analysis of Lead from a Romano-British Coffin\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20Analysis%20of%20Lead%20from%20a%20Romano-British%20Coffin.pdf\" }, { \"title\": \"Bulletin 11-2 - An Early Bronze Age Tin Mine in Anatolia, Turkey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20An%20Early%20Bronze%20Age%20Tin%20Mine%20in%20Anatolia,%20Turkey.pdf\" }, { \"title\": \"Bulletin 11-2 - Burgam - Shropshires Last Working Metal Mine, 1957-1963\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20Burgam%20-%20Shropshires%20Last%20Working%20Metal%20Mine,%201957-1963.pdf\" }, { \"title\": \"Bulletin 11-2 - Derbyshire Miners in Sussex\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20Derbyshire%20Miners%20in%20Sussex.pdf\" }, { \"title\": \"Bulletin 11-2 - Horsebuttock and Winster Pitts Mines, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20Horsebuttock%20and%20Winster%20Pitts%20Mines,%20Winster.pdf\" }, { \"title\": \"Bulletin 11-2 - Loss to Eyam's Mining Heritage\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20Loss%20to%20Eyam's%20Mining%20Heritage.pdf\" }, { \"title\": \"Bulletin 11-2 - Shipping the Great Laxey Ores\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20Shipping%20the%20Great%20Laxey%20Ores.pdf\" }, { \"title\": \"Bulletin 11-2 - The Industrial Archaeology of Rio Tinto and the Iberian Pyrite Belt\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20The%20Industrial%20Archaeology%20of%20Rio%20Tinto%20and%20the%20Iberian%20Pyrite%20Belt.pdf\" }, { \"title\": \"Bulletin 11-2 - The Operation of the Trevithick Wills Founder Water Pressure Engine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-2%20-%20The%20Operation%20of%20the%20Trevithick%20Wills%20Founder%20Water%20Pressure%20Engine.pdf\" }, { \"title\": \"Bulletin 11-3 - Addendum\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Addendum.pdf\" }, { \"title\": \"Bulletin 11-3 - A Lead Horse Moulding Found in a Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20A%20Lead%20Horse%20Moulding%20Found%20in%20a%20Mine.pdf\" }, { \"title\": \"Bulletin 11-3 - Ancient Copper Mining at Wadi Amram, Israel - An Archaeological Survey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Ancient%20Copper%20Mining%20at%20Wadi%20Amram,%20Israel%20-%20An%20Archaeological%20Survey.pdf\" }, { \"title\": \"Bulletin 11-3 - An Early Barmote Court Dispute and Some Facts Relating to Flots, Floats, Flats and Pipes\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20An%20Early%20Barmote%20Court%20Dispute%20and%20Some%20Facts%20Relating%20to%20Flots,%20Floats,%20Flats%20and%20Pipes.pdf\" }, { \"title\": \"Bulletin 11-3 - Clay Mining in the Holymoorside Area of Chesterfield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Clay%20Mining%20in%20the%20Holymoorside%20Area%20of%20Chesterfield.pdf\" }, { \"title\": \"Bulletin 11-3 - Fluorspar Mining in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Fluorspar%20Mining%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 11-3 - Forty Years Ago\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Forty%20Years%20Ago.pdf\" }, { \"title\": \"Bulletin 11-3 - Further Observations on the Trevithick Water Pressure Engine with Comments on the New Museum Model\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Further%20Observations%20on%20the%20Trevithick%20Water%20Pressure%20Engine%20with%20Comments%20on%20the%20New%20Museum%20Model.pdf\" }, { \"title\": \"Bulletin 11-3 - Leslie Owain Ford - Mineral Collector and Joint Founder of the Peak District Mines Historical Society\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Leslie%20Owain%20Ford%20-%20Mineral%20Collector%20and%20Joint%20Founder%20of%20the%20Peak%20District%20Mines%20Historical%20Society.pdf\" }, { \"title\": \"Bulletin 11-3 - Long Garth - A Little Known Copper Mine in the Lake District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Long%20Garth%20-%20A%20Little%20Known%20Copper%20Mine%20in%20the%20Lake%20District.pdf\" }, { \"title\": \"Bulletin 11-3 - Schrams Rock Boring and Air Compressing Machinery\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-3%20-%20Schrams%20Rock%20Boring%20and%20Air%20Compressing%20Machinery.pdf\" }, { \"title\": \"Bulletin 11-4 - A Visit to the Kolar Gold Field, India\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20A%20Visit%20to%20the%20Kolar%20Gold%20Field,%20India.pdf\" }, { \"title\": \"Bulletin 11-4 - Firesetting at Hope Mine, but where is it\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Firesetting%20at%20Hope%20Mine,%20but%20where%20is%20it.pdf\" }, { \"title\": \"Bulletin 11-4 - Gentlemen Barmasters - A Seventeenth Century Mining Dynasty\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Gentlemen%20Barmasters%20-%20A%20Seventeenth%20Century%20Mining%20Dynasty.pdf\" }, { \"title\": \"Bulletin 11-4 - Gypsum Working in the Parish of Orston, Nottinghamshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Gypsum%20Working%20in%20the%20Parish%20of%20Orston,%20Nottinghamshire.pdf\" }, { \"title\": \"Bulletin 11-4 - Horsecroft Shaft, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Horsecroft%20Shaft,%20Winster.pdf\" }, { \"title\": \"Bulletin 11-4 - Lead Mining Industry in the 19th Century - Spanish Industry or British Adventure\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Lead%20Mining%20Industry%20in%20the%2019th%20Century%20-%20Spanish%20Industry%20or%20British%20Adventure.pdf\" }, { \"title\": \"Bulletin 11-4 - Life in a Small Mining Community, 1944 to 1954\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Life%20in%20a%20Small%20Mining%20Community,%201944%20to%201954.pdf\" }, { \"title\": \"Bulletin 11-4 - Mining in North Devon prior to 1800\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20Mining%20in%20North%20Devon%20prior%20to%201800.pdf\" }, { \"title\": \"Bulletin 11-4 - The AD Lead Mines in Swaledale, Yorkshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20The%20AD%20Lead%20Mines%20in%20Swaledale,%20Yorkshire.pdf\" }, { \"title\": \"Bulletin 11-4 - The British Mines Inspectorate - The Early Years\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-4%20-%20The%20British%20Mines%20Inspectorate%20-%20The%20Early%20Years.pdf\" }, { \"title\": \"Bulletin 11-5 - Accidents at Glasshouse Common Ironstone Mine, 1865 and Baddesley Colliery, 1882\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Accidents%20at%20Glasshouse%20Common%20Ironstone%20Mine,%201865%20and%20Baddesley%20Colliery,%201882.pdf\" }, { \"title\": \"Bulletin 11-5 - Ancient Mining Customs used in England Today\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Ancient%20Mining%20Customs%20used%20in%20England%20Today.pdf\" }, { \"title\": \"Bulletin 11-5 - Eric Fisher of Winster - an Obituary\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Eric%20Fisher%20of%20Winster%20-%20an%20Obituary.pdf\" }, { \"title\": \"Bulletin 11-5 - Gazetteer of Tin and Lead Ore Dressing Sites in Great Britain\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Gazetteer%20of%20Tin%20and%20Lead%20Ore%20Dressing%20Sites%20in%20Great%20Britain.pdf\" }, { \"title\": \"Bulletin 11-5 - Letters to the Editor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Letters%20to%20the%20Editor.pdf\" }, { \"title\": \"Bulletin 11-5 - Management and Workers at Miners Engine Mine, Eyam, in the Mid-Eighteenth Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Management%20and%20Workers%20at%20Miners%20Engine%20Mine,%20Eyam,%20in%20the%20Mid-Eighteenth%20Century.pdf\" }, { \"title\": \"Bulletin 11-5 - Report on the 1991 Archaeological Survey of Kestel Tin Mine, Turkey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Report%20on%20the%201991%20Archaeological%20Survey%20of%20Kestel%20Tin%20Mine,%20Turkey.pdf\" }, { \"title\": \"Bulletin 11-5 - The Largest Blue John Vases ever Made\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20The%20Largest%20Blue%20John%20Vases%20ever%20Made.pdf\" }, { \"title\": \"Bulletin 11-5 - Twenty Thousand Miners can't be Wrong\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Twenty%20Thousand%20Miners%20can't%20be%20Wrong.pdf\" }, { \"title\": \"Bulletin 11-5 - Years of Hope for a Shropshire Mine and a Young Miner, 1954 to 1962\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-5%20-%20Years%20of%20Hope%20for%20a%20Shropshire%20Mine%20and%20a%20Young%20Miner,%201954%20to%201962.pdf\" }, { \"title\": \"Bulletin 11-6 - 18th Century Visit to the Speedwell Mine at Castleton by James Plumptre\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%2018th%20Century%20Visit%20to%20the%20Speedwell%20Mine%20at%20Castleton%20by%20James%20Plumptre.pdf\" }, { \"title\": \"Bulletin 11-6 - Ancient and Post-Medieval Mining Sites in the Khetri Copper Belt and Kolar Goldfield, India\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Ancient%20and%20Post-Medieval%20Mining%20Sites%20in%20the%20Khetri%20Copper%20Belt%20and%20Kolar%20Goldfield,%20India.pdf\" }, { \"title\": \"Bulletin 11-6 - Free Men or Wage-Slaves - The Miners of the Wirksworth Area in the 1650s\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Free%20Men%20or%20Wage-Slaves%20-%20The%20Miners%20of%20the%20Wirksworth%20Area%20in%20the%201650s.pdf\" }, { \"title\": \"Bulletin 11-6 - Index to Volume 11\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Index%20to%20Volume%2011.pdf\" }, { \"title\": \"Bulletin 11-6 - Lead Smelting in Welsh Furnaces at Pontesford, Shropshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Lead%20Smelting%20in%20Welsh%20Furnaces%20at%20Pontesford,%20Shropshire.pdf\" }, { \"title\": \"Bulletin 11-6 - Letter to the Editor - Protomania\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Letter%20to%20the%20Editor%20-%20Protomania.pdf\" }, { \"title\": \"Bulletin 11-6 - Letter to the Editor - Twenty Thousand Miners can't be wrong, but Dr. Kiernan can\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Letter%20to%20the%20Editor%20-%20Twenty%20Thousand%20Miners%20can't%20be%20wrong,%20but%20Dr.%20Kiernan%20can.pdf\" }, { \"title\": \"Bulletin 11-6 - Mines and Boundary Stones at Carsington Pasture\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Mines%20and%20Boundary%20Stones%20at%20Carsington%20Pasture.pdf\" }, { \"title\": \"Bulletin 11-6 - Postscript to the Largest Blue John Vase ever Made\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20Postscript%20to%20the%20Largest%20Blue%20John%20Vase%20ever%20Made.pdf\" }, { \"title\": \"Bulletin 11-6 - The Chartermaster System of Mine Management in Shropshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20The%20Chartermaster%20System%20of%20Mine%20Management%20in%20Shropshire.pdf\" }, { \"title\": \"Bulletin 11-6 - The Early Life and geological Work of John Mawe, 1766-1829 and a Note on his Travels in Brazil\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20The%20Early%20Life%20and%20geological%20Work%20of%20John%20Mawe,%201766-1829%20and%20a%20Note%20on%20his%20Travels%20in%20Brazil.pdf\" }, { \"title\": \"Bulletin 11-6 - The Inundation of the Spitalwell Ironstone Pit, Chesterfield, on the 15th March 1864\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2011-6%20-%20The%20Inundation%20of%20the%20Spitalwell%20Ironstone%20Pit,%20Chesterfield,%20on%20the%2015th%20March%201864.pdf\" }, { \"title\": \"Bulletin 12-1 - Origin of the Peak District Orefield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-1%20-%20Origin%20of%20the%20Peak%20District%20Orefield.pdf\" }, { \"title\": \"Bulletin 12-1 - The Minerals of the Peak District of Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-1%20-%20The%20Minerals%20of%20the%20Peak%20District%20of%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 12-2 - An Agreement to Mine Copper in Jersey, Channel Islands\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20An%20Agreement%20to%20Mine%20Copper%20in%20Jersey,%20Channel%20Islands.pdf\" }, { \"title\": \"Bulletin 12-2 - Bole Hill, Sheldon - Evidence of Ironmaking\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Bole%20Hill,%20Sheldon%20-%20Evidence%20of%20Ironmaking.pdf\" }, { \"title\": \"Bulletin 12-2 - Description of a Shaft and Workings in the Garden of Mooresfold, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Description%20of%20a%20Shaft%20and%20Workings%20in%20the%20Garden%20of%20Mooresfold,%20Winster.pdf\" }, { \"title\": \"Bulletin 12-2 - Elias Pedley, a Castleton Lead Miner and his Contribution to early Geological Thought\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Elias%20Pedley,%20a%20Castleton%20Lead%20Miner%20and%20his%20Contribution%20to%20early%20Geological%20Thought.pdf\" }, { \"title\": \"Bulletin 12-2 - Lead Mines and Trials in Glen Auldyn, Isle of Man\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Lead%20Mines%20and%20Trials%20in%20Glen%20Auldyn,%20Isle%20of%20Man.pdf\" }, { \"title\": \"Bulletin 12-2 - Mining on Sark - The French Connection\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Mining%20on%20Sark%20-%20The%20French%20Connection.pdf\" }, { \"title\": \"Bulletin 12-2 - Mining Relics around Crich in the 1960s\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Mining%20Relics%20around%20Crich%20in%20the%201960s.pdf\" }, { \"title\": \"Bulletin 12-2 - Stamp Mills at the Ashanti Mine, Ghana\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Stamp%20Mills%20at%20the%20Ashanti%20Mine,%20Ghana.pdf\" }, { \"title\": \"Bulletin 12-2 - The Buildings and Equipment used at Pennerley Mine, Shropshire, in the late 19th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20The%20Buildings%20and%20Equipment%20used%20at%20Pennerley%20Mine,%20Shropshire,%20in%20the%20late%2019th%20Century.pdf\" }, { \"title\": \"Bulletin 12-2 - The Medieval Silver-Lead Miner\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20The%20Medieval%20Silver-Lead%20Miner.pdf\" }, { \"title\": \"Bulletin 12-2 - Trouble and Strife - The Wirksworth Lead Industry in the Mid-17th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-2%20-%20Trouble%20and%20Strife%20-%20The%20Wirksworth%20Lead%20Industry%20in%20the%20Mid-17th%20Century.pdf\" }, { \"title\": \"Bulletin 12-3 - 15th Century Mining as Shown in the Kuttenberger Kanzionale\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%2015th%20Century%20Mining%20as%20Shown%20in%20the%20Kuttenberger%20Kanzionale.pdf\" }, { \"title\": \"Bulletin 12-3 - An Overview of the Principles of Copper Metallurgy and Practice at Keswick 1567 to 1602\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20An%20Overview%20of%20the%20Principles%20of%20Copper%20Metallurgy%20and%20Practice%20at%20Keswick%201567%20to%201602.pdf\" }, { \"title\": \"Bulletin 12-3 - Archaeological and Circumstantial Evidence for early Mining in Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Archaeological%20and%20Circumstantial%20Evidence%20for%20early%20Mining%20in%20Wales.pdf\" }, { \"title\": \"Bulletin 12-3 - Bronze Age Mines of the Great Orme - Interim Report\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Bronze%20Age%20Mines%20of%20the%20Great%20Orme%20-%20Interim%20Report.pdf\" }, { \"title\": \"Bulletin 12-3 - Coalmills in Tyne and Wear Collieries - The Use of the Waterwheel for Mine Drainage 1600 to 1750\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Coalmills%20in%20Tyne%20and%20Wear%20Collieries%20-%20The%20Use%20of%20the%20Waterwheel%20for%20Mine%20Drainage%201600%20to%201750.pdf\" }, { \"title\": \"Bulletin 12-3 - Coniston Field Visit\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Coniston%20Field%20Visit.pdf\" }, { \"title\": \"Bulletin 12-3 - Dolaucothi Revisited\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Dolaucothi%20Revisited.pdf\" }, { \"title\": \"Bulletin 12-3 - Drawing Ancient Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Drawing%20Ancient%20Mines.pdf\" }, { \"title\": \"Bulletin 12-3 - Early Mining Leats and Ponds in Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Early%20Mining%20Leats%20and%20Ponds%20in%20Wales.pdf\" }, { \"title\": \"Bulletin 12-3 - Early Surface Features of Metal Mining - Towards a Typology\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Early%20Surface%20Features%20of%20Metal%20Mining%20-%20Towards%20a%20Typology.pdf\" }, { \"title\": \"Bulletin 12-3 - Excavating Mines, with Examples from Cwmystwyth, Chinflon and Kestel\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Excavating%20Mines,%20with%20Examples%20from%20Cwmystwyth,%20Chinflon%20and%20Kestel.pdf\" }, { \"title\": \"Bulletin 12-3 - Firesetting Technology\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Firesetting%20Technology.pdf\" }, { \"title\": \"Bulletin 12-3 - Hammer-Stones from the Copper-Mining Site at Ecton, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Hammer-Stones%20from%20the%20Copper-Mining%20Site%20at%20Ecton,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 12-3 - Lead Mining within the Royal Forest of the Peak during the 13th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Lead%20Mining%20within%20the%20Royal%20Forest%20of%20the%20Peak%20during%20the%2013th%20Century.pdf\" }, { \"title\": \"Bulletin 12-3 - Mining without Laws - Origins and Practices of the Weardale Moormasters\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Mining%20without%20Laws%20-%20Origins%20and%20Practices%20of%20the%20Weardale%20Moormasters.pdf\" }, { \"title\": \"Bulletin 12-3 - Notes on Stone Hammers\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Notes%20on%20Stone%20Hammers.pdf\" }, { \"title\": \"Bulletin 12-3 - Silver-Lead - A Restricted Resource - Technological Choice in the Devon Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Silver-Lead%20-%20A%20Restricted%20Resource%20-%20Technological%20Choice%20in%20the%20Devon%20Mines.pdf\" }, { \"title\": \"Bulletin 12-3 - Stamping and Smelting at Upper Merrivale Tin Mill - Preliminary Results 1991 to 1993\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20Stamping%20and%20Smelting%20at%20Upper%20Merrivale%20Tin%20Mill%20-%20Preliminary%20Results%201991%20to%201993.pdf\" }, { \"title\": \"Bulletin 12-3 - The Dovegang Plot - Legal and other Preliminaries to the Driving of Vermuden's Sough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20Dovegang%20Plot%20-%20Legal%20and%20other%20Preliminaries%20to%20the%20Driving%20of%20Vermuden's%20Sough.pdf\" }, { \"title\": \"Bulletin 12-3 - The First Half Century of the Rod-Engine c1540 to c1600\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20First%20Half%20Century%20of%20the%20Rod-Engine%20c1540%20to%20c1600.pdf\" }, { \"title\": \"Bulletin 12-3 - The German Miners at Keswick and the Question of Bismuth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20German%20Miners%20at%20Keswick%20and%20the%20Question%20of%20Bismuth.pdf\" }, { \"title\": \"Bulletin 12-3 - The Hushing Leats at Cwmystwyth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20Hushing%20Leats%20at%20Cwmystwyth.pdf\" }, { \"title\": \"Bulletin 12-3 - The Introduction of Powder\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20Introduction%20of%20Powder.pdf\" }, { \"title\": \"Bulletin 12-3 - The Mining Laws in Flintshire and Denbighshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20Mining%20Laws%20in%20Flintshire%20and%20Denbighshire.pdf\" }, { \"title\": \"Bulletin 12-3 - The Neolithic Industrial Landscape at Cissbury, Sussex\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20Neolithic%20Industrial%20Landscape%20at%20Cissbury,%20Sussex.pdf\" }, { \"title\": \"Bulletin 12-3 - The Tudor Miners of Coleorton, Leicestershire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-3%20-%20The%20Tudor%20Miners%20of%20Coleorton,%20Leicestershire.pdf\" }, { \"title\": \"Bulletin 12-4 - An Eighteenth Century Red Lead Production Record\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20An%20Eighteenth%20Century%20Red%20Lead%20Production%20Record.pdf\" }, { \"title\": \"Bulletin 12-4 - More on the Ecton Hammer-Stones\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20More%20on%20the%20Ecton%20Hammer-Stones.pdf\" }, { \"title\": \"Bulletin 12-4 - Preservation of Colliery Engines and Headframes\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20Preservation%20of%20Colliery%20Engines%20and%20Headframes.pdf\" }, { \"title\": \"Bulletin 12-4 - Sir Archibald Grant of Monymusk, Bart - A Carping Maintainer and his Derbyshire Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20Sir%20Archibald%20Grant%20of%20Monymusk,%20Bart%20-%20A%20Carping%20Maintainer%20and%20his%20Derbyshire%20Mines.pdf\" }, { \"title\": \"Bulletin 12-4 - Sir Francis Then and Now\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20Sir%20Francis%20Then%20and%20Now.pdf\" }, { \"title\": \"Bulletin 12-4 - Smelting Mills in the Upper Dove Valley\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20Smelting%20Mills%20in%20the%20Upper%20Dove%20Valley.pdf\" }, { \"title\": \"Bulletin 12-4 - The Early History of Stoke Sough and Magclough Sough, 1724 to 1738\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20The%20Early%20History%20of%20Stoke%20Sough%20and%20Magclough%20Sough,%201724%20to%201738.pdf\" }, { \"title\": \"Bulletin 12-4 - The Newnam Hearth Furnace\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20The%20Newnam%20Hearth%20Furnace.pdf\" }, { \"title\": \"Bulletin 12-4 - The Sand Mines of Nottingham\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20The%20Sand%20Mines%20of%20Nottingham.pdf\" }, { \"title\": \"Bulletin 12-4 - The Throstle Nest Datestone\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20The%20Throstle%20Nest%20Datestone.pdf\" }, { \"title\": \"Bulletin 12-4 - William Smiths Explanation of the Colliers Dial, 1798\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-4%20-%20William%20Smiths%20Explanation%20of%20the%20Colliers%20Dial,%201798.pdf\" }, { \"title\": \"Bulletin 12-5 - A Note on the British Society of Mining Students 1876 to 1910\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20A%20Note%20on%20the%20British%20Society%20of%20Mining%20Students%201876%20to%201910.pdf\" }, { \"title\": \"Bulletin 12-5 - A Visit to Millclose Mine in 1934\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20A%20Visit%20to%20Millclose%20Mine%20in%201934.pdf\" }, { \"title\": \"Bulletin 12-5 - Back O'the'Edge or Ritheing Lake Mine and May Sough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20Back%20O'the'Edge%20or%20Ritheing%20Lake%20Mine%20and%20May%20Sough.pdf\" }, { \"title\": \"Bulletin 12-5 - From Lead into Gold - the Alchemist's Dream\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20From%20Lead%20into%20Gold%20-%20the%20Alchemist's%20Dream.pdf\" }, { \"title\": \"Bulletin 12-5 - Kestel Tin Mine, Turkey Interim Report 1995\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20Kestel%20Tin%20Mine,%20Turkey%20Interim%20Report%201995.pdf\" }, { \"title\": \"Bulletin 12-5 - Long Rake Spar Mine, Youlgreave\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20Long%20Rake%20Spar%20Mine,%20Youlgreave.pdf\" }, { \"title\": \"Bulletin 12-5 - Not-so-Old Mining History - Photographs of Long Rake Spar Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20Not-so-Old%20Mining%20History%20-%20Photographs%20of%20Long%20Rake%20Spar%20Mine.pdf\" }, { \"title\": \"Bulletin 12-5 - Roads, Agricultural Features and Mines on Carsington Pasture\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20Roads,%20Agricultural%20Features%20and%20Mines%20on%20Carsington%20Pasture.pdf\" }, { \"title\": \"Bulletin 12-5 - Snailbeach Mine and the Disaster of 1895\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-5%20-%20Snailbeach%20Mine%20and%20the%20Disaster%20of%201895.pdf\" }, { \"title\": \"Bulletin 12-6 - A Description of Blackwell A Winning Colliery, Alfreton, Derbyshire in 1933\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20A%20Description%20of%20Blackwell%20A%20Winning%20Colliery,%20Alfreton,%20Derbyshire%20in%201933.pdf\" }, { \"title\": \"Bulletin 12-6 - Correction\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Correction.pdf\" }, { \"title\": \"Bulletin 12-6 - Early Gold Mining in Japan - The Sado Scrolls\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Early%20Gold%20Mining%20in%20Japan%20-%20The%20Sado%20Scrolls.pdf\" }, { \"title\": \"Bulletin 12-6 - Greensward Mines and Its Pumps, Monyash, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Greensward%20Mines%20and%20Its%20Pumps,%20Monyash,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 12-6 - Index - Volume 12\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Index%20-%20Volume%2012.pdf\" }, { \"title\": \"Bulletin 12-6 - Letter - History Repeats Itself\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Letter%20-%20History%20Repeats%20Itself.pdf\" }, { \"title\": \"Bulletin 12-6 - Letter - Roman Lead Smelting\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Letter%20-%20Roman%20Lead%20Smelting.pdf\" }, { \"title\": \"Bulletin 12-6 - The Ashford Marble Works and Cavendish Patronage 1748 to 1905\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20The%20Ashford%20Marble%20Works%20and%20Cavendish%20Patronage%201748%20to%201905.pdf\" }, { \"title\": \"Bulletin 12-6 - The Underground Limestone Workings at Ironbridge, Shropshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20The%20Underground%20Limestone%20Workings%20at%20Ironbridge,%20Shropshire.pdf\" }, { \"title\": \"Bulletin 12-6 - Winster and the Mill Close Strikes 1917 to 1919\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2012-6%20-%20Winster%20and%20the%20Mill%20Close%20Strikes%201917%20to%201919.pdf\" }, { \"title\": \"Bulletin 13-1 - A Cast Iron Hand Pump in Winster Sough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20A%20Cast%20Iron%20Hand%20Pump%20in%20Winster%20Sough.pdf\" }, { \"title\": \"Bulletin 13-1 - An Ashover Lead Mining Tithe Dispute in the 17th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20An%20Ashover%20Lead%20Mining%20Tithe%20Dispute%20in%20the%2017th%20Century.pdf\" }, { \"title\": \"Bulletin 13-1 - John Gell and the Miners - Legal Struggles over Tithes of Lead Ore in Early 17th Century Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20John%20Gell%20and%20the%20Miners%20-%20Legal%20Struggles%20over%20Tithes%20of%20Lead%20Ore%20in%20Early%2017th%20Century%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-1 - Letter to the Editor - B Winning Coke Ovens\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20Letter%20to%20the%20Editor%20-%20B%20Winning%20Coke%20Ovens.pdf\" }, { \"title\": \"Bulletin 13-1 - Millclose Mine Strikes - A Postscript\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20Millclose%20Mine%20Strikes%20-%20A%20Postscript.pdf\" }, { \"title\": \"Bulletin 13-1 - Modern Stone Tools\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20Modern%20Stone%20Tools.pdf\" }, { \"title\": \"Bulletin 13-1 - One Fourth the Whole of Virginia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20One%20Fourth%20the%20Whole%20of%20Virginia.pdf\" }, { \"title\": \"Bulletin 13-1 - Pleasley Pit 1871 to 1983 - Coal Field and Heritage Regeneration Project\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20Pleasley%20Pit%201871%20to%201983%20-%20Coal%20Field%20and%20Heritage%20Regeneration%20Project.pdf\" }, { \"title\": \"Bulletin 13-1 - The History, Productivity and Mineralogy of Snelston Mine, Ashbourne, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20The%20History,%20Productivity%20and%20Mineralogy%20of%20Snelston%20Mine,%20Ashbourne,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-1 - The Lea Lead Smelter in 1936\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20The%20Lea%20Lead%20Smelter%20in%201936.pdf\" }, { \"title\": \"Bulletin 13-1 - The Oldest Artefact of Lead in the Peak - New Evidence from Mam Tor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20The%20Oldest%20Artefact%20of%20Lead%20in%20the%20Peak%20-%20New%20Evidence%20from%20Mam%20Tor.pdf\" }, { \"title\": \"Bulletin 13-1 - The Pithead Baths at Kemberton Colliery\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20The%20Pithead%20Baths%20at%20Kemberton%20Colliery.pdf\" }, { \"title\": \"Bulletin 13-1 - The Use of Firesetting in the Granite Quarries of South India\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-1%20-%20The%20Use%20of%20Firesetting%20in%20the%20Granite%20Quarries%20of%20South%20India.pdf\" }, { \"title\": \"Bulletin 13-2 - An Analysis of the Processes for Smelting Tin\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20An%20Analysis%20of%20the%20Processes%20for%20Smelting%20Tin.pdf\" }, { \"title\": \"Bulletin 13-2 - Ancient Mining on Mendip, Somerset - A Preliminary Report on Recent Work\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Ancient%20Mining%20on%20Mendip,%20Somerset%20-%20A%20Preliminary%20Report%20on%20Recent%20Work.pdf\" }, { \"title\": \"Bulletin 13-2 - A Survey of Engine Houses on the Mines of South Devon\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20A%20Survey%20of%20Engine%20Houses%20on%20the%20Mines%20of%20South%20Devon.pdf\" }, { \"title\": \"Bulletin 13-2 - Digging Back in Time - An Adit Clearance Project at Polgooth, Cornwall\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Digging%20Back%20in%20Time%20-%20An%20Adit%20Clearance%20Project%20at%20Polgooth,%20Cornwall.pdf\" }, { \"title\": \"Bulletin 13-2 - Engine Houses in South-West England\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Engine%20Houses%20in%20South-West%20England.pdf\" }, { \"title\": \"Bulletin 13-2 - Investigation and Management of Industrial Sites within Exmoor National Park\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Investigation%20and%20Management%20of%20Industrial%20Sites%20within%20Exmoor%20National%20Park.pdf\" }, { \"title\": \"Bulletin 13-2 - Iron Ropes for the Cornish Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Iron%20Ropes%20for%20the%20Cornish%20Mines.pdf\" }, { \"title\": \"Bulletin 13-2 - Ironworking in the Blackdown Hills - Results of Recent Survey\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Ironworking%20in%20the%20Blackdown%20Hills%20-%20Results%20of%20Recent%20Survey.pdf\" }, { \"title\": \"Bulletin 13-2 - Kelly Mine - The First Ten Years\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Kelly%20Mine%20-%20The%20First%20Ten%20Years.pdf\" }, { \"title\": \"Bulletin 13-2 - Mapping the Mines and Streamworks of Bodmin Moor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Mapping%20the%20Mines%20and%20Streamworks%20of%20Bodmin%20Moor.pdf\" }, { \"title\": \"Bulletin 13-2 - Quarr Houses on the Isle of Purbeck, Dorset\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Quarr%20Houses%20on%20the%20Isle%20of%20Purbeck,%20Dorset.pdf\" }, { \"title\": \"Bulletin 13-2 - Recording he Tinworks of Dartmoor Forest\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Recording%20he%20Tinworks%20of%20Dartmoor%20Forest.pdf\" }, { \"title\": \"Bulletin 13-2 - Recording the Iron Mines of Exmoor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Recording%20the%20Iron%20Mines%20of%20Exmoor.pdf\" }, { \"title\": \"Bulletin 13-2 - Safety, Presentation and Management of Disused Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Safety,%20Presentation%20and%20Management%20of%20Disused%20Mines.pdf\" }, { \"title\": \"Bulletin 13-2 - The Beginnings of Metallurgy in South-West Britain - Hypotheses and Evidence\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Beginnings%20of%20Metallurgy%20in%20South-West%20Britain%20-%20Hypotheses%20and%20Evidence.pdf\" }, { \"title\": \"Bulletin 13-2 - The Collieries of North Somerset\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Collieries%20of%20North%20Somerset.pdf\" }, { \"title\": \"Bulletin 13-2 - The Conservation and Management of the Industrial Landscape within Dartmoor National Park\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Conservation%20and%20Management%20of%20the%20Industrial%20Landscape%20within%20Dartmoor%20National%20Park.pdf\" }, { \"title\": \"Bulletin 13-2 - The Copper Slag Blocks of Hayle, Cornwall - Remains of the late 18th Century Industry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Copper%20Slag%20Blocks%20of%20Hayle,%20Cornwall%20-%20Remains%20of%20the%20late%2018th%20Century%20Industry.pdf\" }, { \"title\": \"Bulletin 13-2 - The De Lank Granite Quarry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20De%20Lank%20Granite%20Quarry.pdf\" }, { \"title\": \"Bulletin 13-2 - The Early South-Western Tin Industry - An Archaeological View\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Early%20South-Western%20Tin%20Industry%20-%20An%20Archaeological%20View.pdf\" }, { \"title\": \"Bulletin 13-2 - The Lumburn Leat - Evidence for New Pumping Technology at Bere Ferrers in the 15th Century\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Lumburn%20Leat%20-%20Evidence%20for%20New%20Pumping%20Technology%20at%20Bere%20Ferrers%20in%20the%2015th%20Century.pdf\" }, { \"title\": \"Bulletin 13-2 - The Quarried Face - Evidence from Dorset's Cliffstone Quarries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20The%20Quarried%20Face%20-%20Evidence%20from%20Dorset's%20Cliffstone%20Quarries.pdf\" }, { \"title\": \"Bulletin 13-2 - Tin Ingots from Bigbury Bay, South Devon\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Tin%20Ingots%20from%20Bigbury%20Bay,%20South%20Devon.pdf\" }, { \"title\": \"Bulletin 13-2 - Tin Smelting in Devon in the 18th and 19th Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-2%20-%20Tin%20Smelting%20in%20Devon%20in%20the%2018th%20and%2019th%20Centuries.pdf\" }, { \"title\": \"Bulletin 13-3 - Low Technology Zinc Mining in the South West of China\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Low%20Technology%20Zinc%20Mining%20in%20the%20South%20West%20of%20China.pdf\" }, { \"title\": \"Bulletin 13-3 - Michael Eric Smith (1941-1996) Reminiscences of a Friendship\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Michael%20Eric%20Smith%20(1941-1996)%20Reminiscences%20of%20a%20Friendship.pdf\" }, { \"title\": \"Bulletin 13-3 - Mystery Photograph\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Mystery%20Photograph.pdf\" }, { \"title\": \"Bulletin 13-3 - Pyrite Mining and Sulphur Production at Xingwen, China\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Pyrite%20Mining%20and%20Sulphur%20Production%20at%20Xingwen,%20China.pdf\" }, { \"title\": \"Bulletin 13-3 - Roman Mining at Rio Tinto, Huelva, Spain\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Roman%20Mining%20at%20Rio%20Tinto,%20Huelva,%20Spain.pdf\" }, { \"title\": \"Bulletin 13-3 - Sir John Gell and the Derbyshire Lead Industry during the Civil War\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Sir%20John%20Gell%20and%20the%20Derbyshire%20Lead%20Industry%20during%20the%20Civil%20War.pdf\" }, { \"title\": \"Bulletin 13-3 - Suface Remains of the New Venture Lead Mine, Bradwell Moor, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20Suface%20Remains%20of%20the%20New%20Venture%20Lead%20Mine,%20Bradwell%20Moor,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-3 - The Connection of James Hall's Over Engine Mine to Peak and Speedwell Caverns\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20The%20Connection%20of%20James%20Hall's%20Over%20Engine%20Mine%20to%20Peak%20and%20Speedwell%20Caverns.pdf\" }, { \"title\": \"Bulletin 13-3 - The Origins of the Peak District Mines Historical Society. Michael Eric Smith (1941-1996)\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20The%20Origins%20of%20the%20Peak%20District%20Mines%20Historical%20Society.%20Michael%20Eric%20Smith%20(1941-1996).pdf\" }, { \"title\": \"Bulletin 13-3 - The Search for the Coalbrookdale Coalfield's last Horse Gin \", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-3%20-%20The%20Search%20for%20the%20Coalbrookdale%20Coalfield's%20last%20Horse%20Gin%20.pdf\" }, { \"title\": \"Bulletin 13-4 - Derbyshire and Nottinghamshire Pits in 1842\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Derbyshire%20and%20Nottinghamshire%20Pits%20in%201842.pdf\" }, { \"title\": \"Bulletin 13-4 - Early Use of Gunpowder in the Peak District - Stone Quarry Mine and Dutchman Level, Ecton, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Early%20Use%20of%20%20Gunpowder%20in%20the%20Peak%20District%20-%20Stone%20Quarry%20Mine%20and%20Dutchman%20Level,%20Ecton,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 13-4 - Ironstone Mining in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Ironstone%20Mining%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-4 - Letter to the Editor - Mystery Photograph\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Letter%20to%20the%20Editor%20-%20Mystery%20Photograph.pdf\" }, { \"title\": \"Bulletin 13-4 - Mine Drainage and Water Resources\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Mine%20Drainage%20and%20Water%20Resources.pdf\" }, { \"title\": \"Bulletin 13-4 - Pre-European Gold Mining at Ashanti, Ghana\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Pre-European%20Gold%20Mining%20at%20Ashanti,%20Ghana.pdf\" }, { \"title\": \"Bulletin 13-4 - Relief Carvings of Hallein in the Carolino Augusteum Museum at Salzburg, Austria\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Relief%20Carvings%20of%20Hallein%20in%20the%20Carolino%20Augusteum%20Museum%20at%20Salzburg,%20Austria.pdf\" }, { \"title\": \"Bulletin 13-4 - Surface Remains of the New Venture Lead Mine, Bradwell Moor, Derbyshire - Part 2\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Surface%20Remains%20of%20the%20New%20Venture%20Lead%20Mine,%20Bradwell%20Moor,%20Derbyshire%20-%20Part%202.pdf\" }, { \"title\": \"Bulletin 13-4 - Underground Canals in Shropshire Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-4%20-%20Underground%20Canals%20in%20Shropshire%20Mines.pdf\" }, { \"title\": \"Bulletin 13-5 - A Survey of Surface Features at Fool's Venture Mine, Bonsall Leys, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20A%20Survey%20of%20Surface%20Features%20at%20Fool's%20Venture%20Mine,%20Bonsall%20Leys,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-5 - Hard Times - A History of the Derbyshire Chert Industry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20Hard%20Times%20-%20A%20History%20of%20the%20Derbyshire%20Chert%20Industry.pdf\" }, { \"title\": \"Bulletin 13-5 - Ironstone Working in the Coalbrookdale Coalfield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20Ironstone%20Working%20in%20the%20Coalbrookdale%20Coalfield.pdf\" }, { \"title\": \"Bulletin 13-5 - Letter to the Editor - Ashanti Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20Letter%20to%20the%20Editor%20-%20Ashanti%20Mining.pdf\" }, { \"title\": \"Bulletin 13-5 - Observations on Ironstone Mining in Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20Observations%20on%20Ironstone%20Mining%20in%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-5 - Prehistoric Mining at Ecton, Staffordshire - A Dated Antler Tool and its Context\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20Prehistoric%20Mining%20at%20Ecton,%20Staffordshire%20-%20A%20Dated%20%20Antler%20Tool%20and%20its%20Context.pdf\" }, { \"title\": \"Bulletin 13-5 - Research and Excavation at a Tin Stamping Site, Cupboard Hill, United Downs, Cornwall\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20Research%20and%20Excavation%20at%20a%20Tin%20Stamping%20Site,%20Cupboard%20Hill,%20United%20Downs,%20Cornwall.pdf\" }, { \"title\": \"Bulletin 13-5 - The Upper Nestus Pipes - An Ancient Lead Mine in the Peak District of Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-5%20-%20The%20Upper%20Nestus%20Pipes%20-%20An%20Ancient%20Lead%20Mine%20in%20the%20Peak%20District%20of%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-6 - A Brief Guide to Flotation Technology\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20A%20Brief%20Guide%20to%20Flotation%20Technology.pdf\" }, { \"title\": \"Bulletin 13-6 - Aspects of the late 17th Century Lead Industry in Wirksworth, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Aspects%20of%20the%20late%2017th%20Century%20Lead%20Industry%20in%20Wirksworth,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 13-6 - Early Gold Mining in Japan - More Sado Scrolls\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Early%20Gold%20Mining%20in%20Japan%20-%20More%20Sado%20Scrolls.pdf\" }, { \"title\": \"Bulletin 13-6 - Early Gunpowder Work in Longe or Cromford Sough, Derbyshire, 1662 - 1663 and 1676 - 1680\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Early%20Gunpowder%20Work%20in%20Longe%20or%20Cromford%20Sough,%20Derbyshire,%201662%20-%201663%20and%201676%20-%201680.pdf\" }, { \"title\": \"Bulletin 13-6 - Ford Mine, near Grindon, North Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Ford%20Mine,%20near%20Grindon,%20North%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 13-6 - Index to Volume 13\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Index%20to%20Volume%2013.pdf\" }, { \"title\": \"Bulletin 13-6 - James Watt's Steam Engines for the Leadhills Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20James%20Watt's%20Steam%20Engines%20for%20the%20Leadhills%20Mines.pdf\" }, { \"title\": \"Bulletin 13-6 - Notes on a Spanish Mining Museum at La Union\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Notes%20on%20a%20Spanish%20Mining%20Museum%20at%20La%20Union.pdf\" }, { \"title\": \"Bulletin 13-6 - Oil and Mining Museums in Texas\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Oil%20and%20Mining%20Museums%20in%20Texas.pdf\" }, { \"title\": \"Bulletin 13-6 - Ore Dressing in the Manifold Valley, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Ore%20Dressing%20in%20the%20Manifold%20Valley,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 13-6 - Primitive Mining Tools from Temberlini, near Syama, Mali, West Africa\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Primitive%20Mining%20Tools%20from%20Temberlini,%20near%20Syama,%20Mali,%20West%20Africa.pdf\" }, { \"title\": \"Bulletin 13-6 - Surface Remains of the New Venture Lead Mine, Bradwell Moor, Derbyshire - Part 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Surface%20Remains%20of%20the%20New%20Venture%20Lead%20Mine,%20Bradwell%20Moor,%20Derbyshire%20-%20Part%203.pdf\" }, { \"title\": \"Bulletin 13-6 - Washing Floors at Winster Pitts, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2013-6%20-%20Washing%20Floors%20at%20Winster%20Pitts,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 14-1 - The Dudley Limestone Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-1%20-%20The%20Dudley%20Limestone%20Mines.pdf\" }, { \"title\": \"Bulletin 14-2 - 20th Century Lead Mining - Mill Close Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%2020th%20Century%20Lead%20Mining%20-%20Mill%20Close%20Mine.pdf\" }, { \"title\": \"Bulletin 14-2 - Davis Derby - A History of Engineering\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Davis%20Derby%20-%20A%20History%20of%20Engineering.pdf\" }, { \"title\": \"Bulletin 14-2 - Derbyshire Lead Mining in the 18th and 19th Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Derbyshire%20Lead%20Mining%20in%20the%2018th%20and%2019th%20Centuries.pdf\" }, { \"title\": \"Bulletin 14-2 - Horsebuttock, Shack, Little, Drake and Pitts Mines, Winster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Horsebuttock,%20Shack,%20Little,%20Drake%20and%20Pitts%20Mines,%20Winster.pdf\" }, { \"title\": \"Bulletin 14-2 - Jack Beck and Masson Hill - Tribute to a Man and a Mountain\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Jack%20Beck%20and%20Masson%20Hill%20-%20Tribute%20to%20a%20Man%20and%20a%20Mountain.pdf\" }, { \"title\": \"Bulletin 14-2 - Letter to the Editor - A Fair Swop\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Letter%20to%20the%20Editor%20-%20A%20Fair%20Swop.pdf\" }, { \"title\": \"Bulletin 14-2 - Letter to the Editor - Mining and Farming Terms\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Letter%20to%20the%20Editor%20-%20Mining%20and%20Farming%20Terms.pdf\" }, { \"title\": \"Bulletin 14-2 - Mining Scenes Engraved on a Glass Vase\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Mining%20Scenes%20Engraved%20on%20a%20Glass%20Vase.pdf\" }, { \"title\": \"Bulletin 14-2 - Prehistoric and Roman Mining in the Peak District - Present Knowledge and Future Research\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Prehistoric%20and%20Roman%20Mining%20in%20the%20Peak%20District%20-%20Present%20Knowledge%20and%20Future%20Research.pdf\" }, { \"title\": \"Bulletin 14-2 - Stone Hammers from the Ecton Mines in the Bateman Collection, Sheffield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Stone%20Hammers%20from%20the%20Ecton%20Mines%20in%20the%20Bateman%20Collection,%20Sheffield.pdf\" }, { \"title\": \"Bulletin 14-2 - T'Owd Mon wor from Bonser - The Origins of the Medieval Miner's Effergy in Wirksworth Church\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20T'Owd%20Mon%20wor%20from%20Bonser%20-%20The%20Origins%20of%20the%20Medieval%20Miner's%20Effergy%20in%20Wirksworth%20Church.pdf\" }, { \"title\": \"Bulletin 14-2 - The Later Gells and the Decline of the Lead Trade\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20The%20Later%20Gells%20and%20the%20Decline%20of%20the%20Lead%20Trade.pdf\" }, { \"title\": \"Bulletin 14-2 - The Newgate Prison and Simsbury Copper Mine, East Granby, Connecticut\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20The%20Newgate%20Prison%20and%20Simsbury%20Copper%20Mine,%20East%20Granby,%20Connecticut.pdf\" }, { \"title\": \"Bulletin 14-2 - Tunnel Lining at Rio Tinto - Methods used at Las Minas de Rio Tinto, in Spain, 1954\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Tunnel%20Lining%20at%20Rio%20Tinto%20-%20Methods%20used%20at%20Las%20Minas%20de%20Rio%20Tinto,%20in%20Spain,%201954.pdf\" }, { \"title\": \"Bulletin 14-2 - Walter Sylvestor - Potteries Inventer and His Famous Invention - The Sylvester\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-2%20-%20Walter%20Sylvestor%20-%20Potteries%20Inventer%20and%20His%20Famous%20Invention%20-%20The%20Sylvester.pdf\" }, { \"title\": \"Bulletin 14-3 - Old Mill Close Mine, Wensley\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-3%20-%20Old%20Mill%20Close%20Mine,%20Wensley.pdf\" }, { \"title\": \"Bulletin 14-4 - An Example of Fire Setting in West Africa\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20An%20Example%20of%20Fire%20Setting%20in%20West%20Africa.pdf\" }, { \"title\": \"Bulletin 14-4 - Beach Slags of the North Wales Coast\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20Beach%20Slags%20of%20the%20North%20Wales%20Coast.pdf\" }, { \"title\": \"Bulletin 14-4 - Geology of Ecton and other North-East Staffordshire Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20Geology%20of%20Ecton%20and%20other%20North-East%20Staffordshire%20Mines.pdf\" }, { \"title\": \"Bulletin 14-4 - Letter to the Editor - Glass Vase\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20Letter%20to%20the%20Editor%20-%20Glass%20Vase.pdf\" }, { \"title\": \"Bulletin 14-4 - Letter to the Editor - Walter Sylvester\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20Letter%20to%20the%20Editor%20-%20Walter%20Sylvester.pdf\" }, { \"title\": \"Bulletin 14-4 - Mount Wellington Mine, Gwennap, Cornwall\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20Mount%20Wellington%20Mine,%20Gwennap,%20Cornwall.pdf\" }, { \"title\": \"Bulletin 14-4 - Review - Exploration for Metalliferous and Related Minerals in Britain - A Guide\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20Review%20-%20Exploration%20for%20Metalliferous%20and%20Related%20Minerals%20in%20Britain%20-%20A%20Guide.pdf\" }, { \"title\": \"Bulletin 14-4 - The Imperial Spanish Silver Mines of Potosi, Bolivia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20The%20Imperial%20Spanish%20Silver%20Mines%20of%20Potosi,%20Bolivia.pdf\" }, { \"title\": \"Bulletin 14-4 - The Last of the Walking Draglines, the Largest Mobile Land Machines in the UK\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-4%20-%20The%20Last%20of%20the%20Walking%20Draglines,%20the%20Largest%20Mobile%20Land%20Machines%20in%20the%20UK.pdf\" }, { \"title\": \"Bulletin 14-5 - A History and Gazetteer of the Mines in the Liberty of Peak Forest, Derbyshire - 1605 to 1878\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20A%20History%20and%20Gazetteer%20of%20the%20Mines%20in%20the%20Liberty%20of%20Peak%20Forest,%20Derbyshire%20-%201605%20to%201878.pdf\" }, { \"title\": \"Bulletin 14-5 - Derbyshire Wad and Umber\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20Derbyshire%20Wad%20and%20Umber.pdf\" }, { \"title\": \"Bulletin 14-5 - Farmers versus Miners - A Case of Pollution\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20Farmers%20versus%20Miners%20-%20A%20Case%20of%20Pollution.pdf\" }, { \"title\": \"Bulletin 14-5 - Mining History Notes - Devonshire Cavern and Old Ash Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20Mining%20History%20Notes%20-%20Devonshire%20Cavern%20and%20Old%20Ash%20Mine.pdf\" }, { \"title\": \"Bulletin 14-5 - Review - Worth a Thousand Words - Mining Picture Books\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20Review%20-%20Worth%20a%20Thousand%20Words%20-%20Mining%20Picture%20Books.pdf\" }, { \"title\": \"Bulletin 14-5 - The Origins and Development of the British Coprolite Industry\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20The%20Origins%20and%20Development%20of%20the%20British%20Coprolite%20Industry.pdf\" }, { \"title\": \"Bulletin 14-5 - Tramways and Locomotves at 20th Century Mines in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-5%20-%20Tramways%20and%20Locomotves%20at%2020th%20Century%20Mines%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 14-6 - How Old is the Owld Man - Discovering Ancient Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20How%20Old%20is%20the%20Owld%20Man%20-%20Discovering%20Ancient%20Mines.pdf\" }, { \"title\": \"Bulletin 14-6 - Index to Volume 14\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Index%20to%20Volume%2014.pdf\" }, { \"title\": \"Bulletin 14-6 - Mining History and the Internet\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Mining%20History%20and%20the%20Internet.pdf\" }, { \"title\": \"Bulletin 14-6 - Nature Conservation and Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Nature%20Conservation%20and%20Mines.pdf\" }, { \"title\": \"Bulletin 14-6 - Review - Angerstein's Travel Diary, by Torsten and Peter Berg\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Review%20-%20Angerstein's%20Travel%20Diary,%20by%20Torsten%20and%20Peter%20Berg.pdf\" }, { \"title\": \"Bulletin 14-6 - Roman Mining Law\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Roman%20Mining%20Law.pdf\" }, { \"title\": \"Bulletin 14-6 - Surface Remains of the Pindale Area, Castleton, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Surface%20Remains%20of%20the%20Pindale%20Area,%20Castleton,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 14-6 - Swearing-In of a New Barmaster\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Swearing-In%20of%20a%20New%20Barmaster.pdf\" }, { \"title\": \"Bulletin 14-6 - The Geology of the Matlock Mines - A Review\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20The%20Geology%20of%20the%20Matlock%20Mines%20-%20A%20Review.pdf\" }, { \"title\": \"Bulletin 14-6 - The Mining Laws in North Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20The%20Mining%20Laws%20in%20North%20Wales.pdf\" }, { \"title\": \"Bulletin 14-6 - Thomas Sopwith and the Forest of Dean, 1832 to 1841\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Thomas%20Sopwith%20and%20the%20Forest%20of%20Dean,%201832%20to%201841.pdf\" }, { \"title\": \"Bulletin 14-6 - Working at New Dunn Mine in the Forest of Dean in the 1940s\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2014-6%20-%20Working%20at%20New%20Dunn%20Mine%20in%20the%20Forest%20of%20Dean%20in%20the%201940s.pdf\" }, { \"title\": \"Bulletin 15-1 - Arbor Low Calcite Mine, Youlgreave, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20Arbor%20Low%20Calcite%20Mine,%20Youlgreave,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 15-1 - Calcite Mining in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20Calcite%20Mining%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 15-1 - Lead Veins within the Coal Mines around Whaley Bridge\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20Lead%20Veins%20within%20the%20Coal%20Mines%20around%20Whaley%20Bridge.pdf\" }, { \"title\": \"Bulletin 15-1 - Millclose Mine at Cowley Knoll, Wensley\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20%20Millclose%20Mine%20at%20Cowley%20Knoll,%20Wensley.pdf\" }, { \"title\": \"Bulletin 15-1 - Some Notes on Peat Working and Turbury Rights\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20Some%20Notes%20on%20Peat%20Working%20and%20Turbury%20Rights.pdf\" }, { \"title\": \"Bulletin 15-1 - Stone Mining Hammers from Pre-Hispanic Mesoamerica\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20Stone%20Mining%20Hammers%20from%20Pre-Hispanic%20Mesoamerica.pdf\" }, { \"title\": \"Bulletin 15-1 - Surface Remains of the Castleton and Peak Forest Area\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20Surface%20Remains%20of%20the%20Castleton%20and%20Peak%20Forest%20Area.pdf\" }, { \"title\": \"Bulletin 15-1 - The Development of Deep Ecton Mine, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20The%20Development%20of%20Deep%20Ecton%20Mine,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 15-1 - The Mow Cop Tunnel and Tramways\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20The%20Mow%20Cop%20Tunnel%20and%20Tramways.pdf\" }, { \"title\": \"Bulletin 15-1 - The Wedge-Effect in Firesetting of a Sarsen Stone\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-1%20-%20The%20Wedge-Effect%20in%20Firesetting%20of%20a%20Sarsen%20Stone.pdf\" }, { \"title\": \"Bulletin 15-2 - How Grove Excavation Report\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-2%20-%20How%20Grove%20Excavation%20Report.pdf\" }, { \"title\": \"Bulletin 15-3 - A Journey to the Kennecott Copper Mine, Alaska\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20A%20Journey%20to%20the%20Kennecott%20Copper%20Mine,%20Alaska.pdf\" }, { \"title\": \"Bulletin 15-3 - An Attempt in 1935-7 to Rework Coalpithole Mine, Peak Forest, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20An%20Attempt%20in%201935-7%20to%20Rework%20Coalpithole%20Mine,%20Peak%20Forest,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 15-3 - Errata - How Grove\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20Errata%20-%20How%20Grove.pdf\" }, { \"title\": \"Bulletin 15-3 - Iron Mining in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20Iron%20Mining%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 15-3 - Letter to the Editor - Potosi Revisited\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20Letter%20to%20the%20Editor%20-%20Potosi%20Revisited.pdf\" }, { \"title\": \"Bulletin 15-3 - Postscript - Calcite Mining in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20Postscript%20-%20Calcite%20Mining%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 15-3 - The Diary of John Wesley Harvey, Manager of the Whaley Bridge Colliery , Derbyshire, 1898 to 1899\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20The%20Diary%20of%20John%20Wesley%20Harvey,%20Manager%20of%20the%20Whaley%20Bridge%20Colliery%20,%20Derbyshire,%201898%20to%201899.pdf\" }, { \"title\": \"Bulletin 15-3 - The Lower Nestus Pipe Re-Entered\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20The%20Lower%20Nestus%20Pipe%20Re-Entered.pdf\" }, { \"title\": \"Bulletin 15-3 - The Maury and Burfoot Mines, Taddington and Brushfield, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20The%20Maury%20and%20Burfoot%20Mines,%20Taddington%20and%20Brushfield,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 15-3 - The Miners' Tale - Golconda (Derbyshire) 1916 to 1957\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-3%20-%20The%20Miners'%20Tale%20-%20Golconda%20(Derbyshire)%201916%20to%201957.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - 16th Century Water Power in the Gastein District of the Austrian Alps\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%2016th%20Century%20Water%20Power%20in%20the%20Gastein%20District%20of%20the%20Austrian%20Alps.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Cobden and Bright at Dylife\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Cobden%20and%20Bright%20at%20Dylife.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Conclusions - Over Two Thousand Years of Water Power\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Conclusions%20-%20Over%20Two%20Thousand%20Years%20of%20Water%20Power.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Cwm Dyfor Copper Mine. The Collection of Water\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Cwm%20Dyfor%20Copper%20Mine.%20The%20Collection%20of%20Water.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Early Leats and Hushing Remains - Suggestions and Disputes of Roman Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Early%20Leats%20and%20Hushing%20Remains%20-%20Suggestions%20and%20Disputes%20of%20Roman%20Mining.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - History of Utilization of Water Power in the Mines of Freiberg, Saxony\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20History%20of%20Utilization%20of%20Water%20Power%20in%20the%20Mines%20of%20Freiberg,%20Saxony.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Hydraulic Mining from California to British Columbia the Long Way\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Hydraulic%20Mining%20from%20California%20to%20British%20Columbia%20the%20Long%20Way.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Mining Waterpower Leats in Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Mining%20Waterpower%20Leats%20in%20Wales.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Pliny's Arrugia - Water Power in Roman Gold-Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Pliny's%20Arrugia%20-%20Water%20Power%20in%20Roman%20Gold-Mining.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Sir Francis Level - Driven by Water\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Sir%20Francis%20Level%20-%20Driven%20by%20Water.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Some Minor Uses of Water Power in Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Some%20Minor%20Uses%20of%20Water%20Power%20in%20Mining.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Streaming and Hushing for Scottish Gold - The Archaeology of Early Gold Working\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Streaming%20and%20Hushing%20for%20Scottish%20Gold%20-%20The%20Archaeology%20of%20Early%20Gold%20Working.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Swaledale's Hydraulic Engines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Swaledale's%20Hydraulic%20Engines.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - The Myers Head Water Wheel System\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20The%20Myers%20Head%20Water%20Wheel%20System.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - The Tangential Impulse Water Wheel in California Gold Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20The%20Tangential%20Impulse%20Water%20Wheel%20in%20California%20Gold%20Mining.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - The Use of Water Power at Brewery Shaft, Nenthead\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20The%20Use%20of%20Water%20Power%20at%20Brewery%20Shaft,%20Nenthead.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - The Water Resources on Grassington Moor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20The%20Water%20Resources%20on%20Grassington%20Moor.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Underground Power Generation at the Comstock Lode and the Sutro Tunnel, Nevada\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Underground%20Power%20Generation%20at%20the%20Comstock%20Lode%20and%20the%20Sutro%20Tunnel,%20Nevada.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Water Power in Peak District Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Water%20Power%20in%20Peak%20District%20Mining.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Water Power in the Slate Mines of East Festiniog\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Water%20Power%20in%20the%20Slate%20Mines%20of%20East%20Festiniog.pdf\" }, { \"title\": \"Bulletin 15-4&amp;5 - Whither Water Power - A Direction for the Future, Based on the Past\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-4&amp;5%20-%20Whither%20Water%20Power%20-%20A%20Direction%20for%20the%20Future,%20Based%20on%20the%20Past.pdf\" }, { \"title\": \"Bulletin 15-6 - Astbury Hydraulic Lime Works, Newbold, Cheshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20Astbury%20Hydraulic%20Lime%20Works,%20Newbold,%20Cheshire.pdf\" }, { \"title\": \"Bulletin 15-6 - Geology of the Lead Mines around the Stanton Syncline\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20Geology%20of%20the%20Lead%20Mines%20around%20the%20Stanton%20Syncline.pdf\" }, { \"title\": \"Bulletin 15-6 - Index to Volume 15\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20Index%20to%20Volume%2015.pdf\" }, { \"title\": \"Bulletin 15-6 - Lead and Calcite Workings near Chelmorton, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20Lead%20and%20Calcite%20Workings%20near%20Chelmorton,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 15-6 - Rio Tinto Revisited\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20Rio%20Tinto%20Revisited.pdf\" }, { \"title\": \"Bulletin 15-6 - The Schlackenwald, Bohemia, Mining Law of 1548\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20The%20Schlackenwald,%20Bohemia,%20Mining%20Law%20of%201548.pdf\" }, { \"title\": \"Bulletin 15-6 - The Silver Rig, Pibble and Woodhead Mines, Galloway, Scotland\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20The%20Silver%20Rig,%20Pibble%20and%20Woodhead%20Mines,%20Galloway,%20Scotland.pdf\" }, { \"title\": \"Bulletin 15-6 - Women and the Lead Trade in Wirksworth, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2015-6%20-%20Women%20and%20the%20Lead%20Trade%20in%20Wirksworth,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 16-1 - Mines, Quarries and Murders\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-1%20-%20Mines,%20Quarries%20and%20Murders.pdf\" }, { \"title\": \"Bulletin 16-2 - Geology of the Wirksworth Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-2%20-%20Geology%20of%20the%20Wirksworth%20Mines.pdf\" }, { \"title\": \"Bulletin 16-3 - Using Coal to Mine Lead - Firesetting at Peak District Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-3%20-%20Using%20Coal%20to%20Mine%20Lead%20-%20Firesetting%20at%20Peak%20District%20Mines.pdf\" }, { \"title\": \"Bulletin 16-4 - Barytes Mills at Shallcross, Cadster and Barmoor Clough\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Barytes%20Mills%20at%20Shallcross,%20Cadster%20and%20Barmoor%20Clough.pdf\" }, { \"title\": \"Bulletin 16-4 - Coal Mine Soughs of the Rivers Goyt and Sett\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Coal%20Mine%20Soughs%20of%20the%20Rivers%20Goyt%20and%20Sett.pdf\" }, { \"title\": \"Bulletin 16-4 - Coal Mining around Chapel-en-le-Frith\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Coal%20Mining%20around%20Chapel-en-le-Frith.pdf\" }, { \"title\": \"Bulletin 16-4 - Force Crag Mine Mill\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Force%20Crag%20Mine%20Mill.pdf\" }, { \"title\": \"Bulletin 16-4 - Forest of Dean Coal Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Forest%20of%20Dean%20Coal%20Mining.pdf\" }, { \"title\": \"Bulletin 16-4 - Ralph Greatorex - A Forgotten Scientist and Mining Engineer\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Ralph%20Greatorex%20-%20A%20Forgotten%20Scientist%20and%20Mining%20Engineer.pdf\" }, { \"title\": \"Bulletin 16-4 - Royledge and New York Copper Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20Royledge%20and%20New%20York%20Copper%20Mines.pdf\" }, { \"title\": \"Bulletin 16-4 - The Rev. Mr. Carrier\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-4%20-%20The%20Rev.%20Mr.%20Carrier.pdf\" }, { \"title\": \"Bulletin 16-5 - Exploration of Mines at Perryfoot\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-5%20-%20Exploration%20of%20Mines%20at%20Perryfoot.pdf\" }, { \"title\": \"Bulletin 16-5 - Geological Setting of the Mineral Deposits at Brassington and Carsington\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-5%20-%20Geological%20Setting%20of%20the%20Mineral%20Deposits%20at%20Brassington%20and%20Carsington.pdf\" }, { \"title\": \"Bulletin 16-5 - Geophysical Survey at Magpie Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-5%20-%20Geophysical%20Survey%20at%20Magpie%20Mine.pdf\" }, { \"title\": \"Bulletin 16-5 - History of Coalpithole Vein\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-5%20-%20History%20of%20Coalpithole%20Vein.pdf\" }, { \"title\": \"Bulletin 16-6 - A Gazetteer of the Mines within Castleton and Hope Liberties\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-6%20-%20A%20Gazetteer%20of%20the%20Mines%20within%20Castleton%20and%20Hope%20Liberties.pdf\" }, { \"title\": \"Bulletin 16-6 - Black Country Mining before the Industrial Revolution\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-6%20-%20Black%20Country%20Mining%20before%20the%20Industrial%20Revolution.pdf\" }, { \"title\": \"Bulletin 16-6 - Hard Times for Lead Miners\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2016-6%20-%20Hard%20Times%20for%20Lead%20Miners.pdf\" }, { \"title\": \"Bulletin 17-1 - Coal Mining in the Hamlets of Beard and Bugsworth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-1%20-%20Coal%20Mining%20in%20the%20Hamlets%20of%20Beard%20and%20Bugsworth.pdf\" }, { \"title\": \"Bulletin 17-1 - The Mines and Forges of the Lower Derwent Valley\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-1%20-%20The%20Mines%20and%20Forges%20of%20the%20Lower%20Derwent%20Valley.pdf\" }, { \"title\": \"Bulletin 17-2 - A Coal Getting Agreement, No 1 Mercantile Colliery\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-2%20-%20A%20Coal%20Getting%20Agreement,%20No%201%20Mercantile%20Colliery.pdf\" }, { \"title\": \"Bulletin 17-2 - A Gazetteer of the Lead Mines in Buxton, Fairfield, and Wormhill\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-2%20-%20A%20Gazetteer%20of%20the%20Lead%20Mines%20in%20Buxton,%20Fairfield,%20and%20Wormhill.pdf\" }, { \"title\": \"Bulletin 17-2 - The Formation and Early History of Beard Colliery\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-2%20-%20The%20Formation%20and%20Early%20History%20of%20Beard%20Colliery.pdf\" }, { \"title\": \"Bulletin 17-2 - The Geological Setting of the Lead Mines in the Lathkill Dale and Wye Valley Area\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-2%20-%20The%20Geological%20Setting%20of%20the%20Lead%20Mines%20in%20the%20Lathkill%20Dale%20and%20Wye%20Valley%20Area.pdf\" }, { \"title\": \"Bulletin 17-3 - Metal Mines through Time\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-3%20-%20Metal%20Mines%20through%20Time.pdf\" }, { \"title\": \"Bulletin 17-4 - 20th-century Tasmanian Osmiridium Mining\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%2020th-century%20Tasmanian%20Osmiridium%20Mining.pdf\" }, { \"title\": \"Bulletin 17-4 - Archaeology of mining landscapes in Germany\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20Archaeology%20of%20mining%20landscapes%20in%20Germany.pdf\" }, { \"title\": \"Bulletin 17-4 - Early Mining and Metallurgy in Zimbabwe\u2019s Eastern Highlands\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20Early%20Mining%20and%20Metallurgy%20in%20Zimbabwe%E2%80%99s%20Eastern%20Highlands.pdf\" }, { \"title\": \"Bulletin 17-4 - Linares, Spain \u2013 The British Contribution to the Landscape\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20Linares,%20Spain%20%E2%80%93%20The%20British%20Contribution%20to%20the%20Landscape.pdf\" }, { \"title\": \"Bulletin 17-4 - Mining, Quarrying, Archaeology and the Historic Environment\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20Mining,%20Quarrying,%20Archaeology%20and%20the%20Historic%20Environment.pdf\" }, { \"title\": \"Bulletin 17-4 - NAMHO Conference 2009 Abstracts\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20NAMHO%20Conference%202009%20Abstracts.pdf\" }, { \"title\": \"Bulletin 17-4 - NAMHO so far - What has it Achieved\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20NAMHO%20so%20far%20-%20What%20has%20it%20Achieved.pdf\" }, { \"title\": \"Bulletin 17-4 - National Coal Mining Museums\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20National%20Coal%20Mining%20Museums.pdf\" }, { \"title\": \"Bulletin 17-4 - The Development of Colliery Haulage and Winding Systems\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20The%20Development%20of%20Colliery%20Haulage%20and%20Winding%20Systems.pdf\" }, { \"title\": \"Bulletin 17-4 - The Ecology of Lead Mining Remains in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20The%20Ecology%20of%20Lead%20Mining%20Remains%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 17-4 - The Lead Legacy Recent Archaeological Research and Conservation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20The%20Lead%20Legacy%20Recent%20Archaeological%20Research%20and%20Conservation.pdf\" }, { \"title\": \"Bulletin 17-4 - The Port Phillip and Colonial Gold Mining Company\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-4%20-%20The%20Port%20Phillip%20and%20Colonial%20Gold%20Mining%20Company.pdf\" }, { \"title\": \"Bulletin 17-5 - A History and Gazetteer of the Lead Mines within Bradwell Liberty\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-5%20-%20A%20History%20and%20Gazetteer%20of%20the%20Lead%20Mines%20within%20Bradwell%20Liberty.pdf\" }, { \"title\": \"Bulletin 17-5 - Saxon Miners in Serbian Medieval Laws\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-5%20-%20Saxon%20Miners%20in%20Serbian%20Medieval%20Laws.pdf\" }, { \"title\": \"Bulletin 17-5 - The Geological Setting of the Lead Mines in the Northern Part of the White Peak\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-5%20-%20The%20Geological%20Setting%20of%20the%20Lead%20Mines%20in%20the%20Northern%20Part%20of%20the%20White%20Peak.pdf\" }, { \"title\": \"Bulletin 17-6 - A Model of Beever Mine at Grassington\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-6%20-%20A%20Model%20of%20Beever%20Mine%20at%20Grassington.pdf\" }, { \"title\": \"Bulletin 17-6 - Index\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-6%20-%20Index.pdf\" }, { \"title\": \"Bulletin 17-6 - John Barratt and the Grassington Mines 1818-1834\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-6%20-%20John%20Barratt%20and%20the%20Grassington%20Mines%201818-1834.pdf\" }, { \"title\": \"Bulletin 17-6 - Subsidence working the Coal at Whaley Bridge - 1883 To 1903\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-6%20-%20Subsidence%20working%20the%20Coal%20at%20Whaley%20Bridge%20-%201883%20To%201903.pdf\" }, { \"title\": \"Bulletin 17-6 - The Baryte Mines at Grin Hill, Ladmanlow and Stanley Moor\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-6%20-%20The%20Baryte%20Mines%20at%20Grin%20Hill,%20Ladmanlow%20and%20Stanley%20Moor.pdf\" }, { \"title\": \"Bulletin 17-6 - The North Yorkshire Moors Coalfields\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2017-6%20-%20The%20North%20Yorkshire%20Moors%20Coalfields.pdf\" }, { \"title\": \"Bulletin 18-1 &amp; 2 - High Rake Mine, Excavations and Conservation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-1%20&amp;%202%20-%20High%20Rake%20Mine,%20Excavations%20and%20Conservation.pdf\" }, { \"title\": \"Bulletin 18-3 - Gazetteer of Hartington Liberty\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-3%20-%20Gazetteer%20of%20Hartington%20Liberty.pdf\" }, { \"title\": \"Bulletin 18-3 - Geology of Hucklow, Eyam, Stony Middleton &amp; Longstone Edge\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-3%20-%20Geology%20of%20Hucklow,%20Eyam,%20Stony%20Middleton%20&amp;%20Longstone%20Edge.pdf\" }, { \"title\": \"Bulletin 18-4 - Norfolk Ironstone Workings\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-4%20-%20Norfolk%20Ironstone%20Workings.pdf\" }, { \"title\": \"Bulletin 18-4 - Silence Mine, Grindlow\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-4%20-%20Silence%20Mine,%20Grindlow.pdf\" }, { \"title\": \"Bulletin 18-5 - A Chromite Ore Crusher in the Shetland Isles\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-5%20-%20A%20Chromite%20Ore%20Crusher%20in%20the%20Shetland%20Isles.pdf\" }, { \"title\": \"Bulletin 18-5 - Purley Chase Manganese Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-5%20-%20Purley%20Chase%20Manganese%20Mine.pdf\" }, { \"title\": \"Bulletin 18-5 - Saxon Mining in Medieval Serbia\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-5%20-%20Saxon%20Mining%20in%20Medieval%20Serbia.pdf\" }, { \"title\": \"Bulletin 18-5 - Underground Surveying at Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-5%20-%20Underground%20Surveying%20at%20Mines.pdf\" }, { \"title\": \"Bulletin 18-5 - William Senior's 1617 Map of Sheldon\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-5%20-%20William%20Senior's%201617%20Map%20of%20Sheldon.pdf\" }, { \"title\": \"Bulletin 18-6 - Index to Volume 18\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-6%20-%20Index%20to%20Volume%2018.pdf\" }, { \"title\": \"Bulletin 18-6 - The Lead Legacy - An Updated Inventory of Important Metal and Gangue Mining Sites in the Peak District\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2018-6%20-%20The%20Lead%20Legacy%20-%20An%20Updated%20Inventory%20of%20Important%20Metal%20and%20Gangue%20Mining%20Sites%20in%20the%20Peak%20District.pdf\" }, { \"title\": \"Bulletin 19-1 - A Gazetteer and History of the Lead Mines within the Liberty of Tideswell, Derbyshire - 1189-1945\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-1%20-%20A%20Gazetteer%20and%20History%20of%20the%20Lead%20Mines%20within%20the%20Liberty%20of%20Tideswell,%20Derbyshire%20-%201189-1945.pdf\" }, { \"title\": \"Bulletin 19-1 - Letter to the Editor - Manganese Mining at Nuneaton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-1%20-%20Letter%20to%20the%20Editor%20-%20Manganese%20Mining%20at%20Nuneaton.pdf\" }, { \"title\": \"Bulletin 19-1 - The Geological Setting of the Old Lead Mines of Ashover and Crich, Derbyshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-1%20-%20The%20Geological%20Setting%20of%20the%20Old%20Lead%20Mines%20of%20Ashover%20and%20Crich,%20Derbyshire.pdf\" }, { \"title\": \"Bulletin 19-2 - Coal Mining near Buxton - Thatch Marsh, Orchard Common and Goyt's Moss\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-2%20-%20Coal%20Mining%20near%20Buxton%20-%20Thatch%20Marsh,%20Orchard%20Common%20and%20Goyt's%20Moss.pdf\" }, { \"title\": \"Bulletin 19-2 - Derbyshire Roman Lead Pigs and 'Lutudarum'\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-2%20-%20Derbyshire%20Roman%20Lead%20Pigs%20and%20'Lutudarum'.pdf\" }, { \"title\": \"Bulletin 19-2 - The Mines of Middleton Flats\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-2%20-%20The%20Mines%20of%20Middleton%20Flats.pdf\" }, { \"title\": \"Bulletin 19-3 - EXCAVATIONS AT PITCHCROFT LIMESTONE MINE, CHURCH ASTON\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20EXCAVATIONS%20AT%20PITCHCROFT%20LIMESTONE%20MINE,%20CHURCH%20ASTON.pdf\" }, { \"title\": \"Bulletin 19-3 - Lead and Zinc mining in Flintshire - the engineering legacy for new development\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Lead%20and%20Zinc%20mining%20in%20Flintshire%20-%20the%20engineering%20legacy%20for%20new%20development.pdf\" }, { \"title\": \"Bulletin 19-3 - Lead Mining Landscapes of Southern Spain\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Lead%20Mining%20Landscapes%20of%20Southern%20Spain.pdf\" }, { \"title\": \"Bulletin 19-3 - Management of the Mining Heritage on Mynydd Parys\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Management%20of%20the%20Mining%20Heritage%20on%20Mynydd%20Parys.pdf\" }, { \"title\": \"Bulletin 19-3 - Managing the Environmental Legacies of Frongoch Lead and Zinc Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Managing%20the%20Environmental%20Legacies%20of%20Frongoch%20Lead%20and%20Zinc%20Mine.pdf\" }, { \"title\": \"Bulletin 19-3 - Medieval mining in Saxony - Selected Results from Excavations of High Medieval Silver Mines in Dippoldiswalde and Niederp\u00f6bel\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Medieval%20mining%20in%20Saxony%20-%20Selected%20Results%20from%20Excavations%20of%20High%20Medieval%20Silver%20Mines%20in%20Dippoldiswalde%20and%20Niederp%C3%B6bel.pdf\" }, { \"title\": \"Bulletin 19-3 - New investigations and new ideas on Prehistoric-Roman metal mining and smelting in Wales\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20New%20investigations%20and%20new%20ideas%20on%20Prehistoric-Roman%20metal%20mining%20and%20smelting%20in%20Wales.pdf\" }, { \"title\": \"Bulletin 19-3 - Penmaenmawr Quarries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Penmaenmawr%20Quarries.pdf\" }, { \"title\": \"Bulletin 19-3 - Silver in Queensland - The Problem of Ore Processing\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20Silver%20in%20Queensland%20-%20The%20Problem%20of%20Ore%20Processing.pdf\" }, { \"title\": \"Bulletin 19-3 - The Monks Who Mined\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20The%20Monks%20Who%20Mined.pdf\" }, { \"title\": \"Bulletin 19-3 - The Neston Coalfield\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-3%20-%20The%20Neston%20Coalfield.pdf\" }, { \"title\": \"Bulletin 19-4 - A 13th Century Mining Dispute in the Central Orefields\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-4%20-%20A%2013th%20Century%20Mining%20Dispute%20in%20the%20Central%20Orefields.pdf\" }, { \"title\": \"Bulletin 19-4 - Coal Mining on the Peak District's Eastern Uplands during the 16th to Early-20th Centuries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-4%20-%20Coal%20Mining%20on%20the%20Peak%20District's%20Eastern%20Uplands%20during%20the%2016th%20to%20Early-20th%20Centuries.pdf\" }, { \"title\": \"Bulletin 19-5 - A History and Gazetteer of the Lead Mines within the Private Liberty or Lordship of Hazlebadge, Derbyshire - 1292-1947\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-5%20-%20A%20History%20and%20Gazetteer%20of%20the%20Lead%20Mines%20within%20the%20Private%20Liberty%20or%20Lordship%20of%20Hazlebadge,%20Derbyshire%20-%201292-1947.pdf\" }, { \"title\": \"Bulletin 19-5 - The 1788 Boulton and Watt Engine House at Ecton - Archaeological Excavations 2012-14\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-5%20-%20The%201788%20Boulton%20and%20Watt%20Engine%20House%20at%20Ecton%20-%20Archaeological%20Excavations%202012-14.pdf\" }, { \"title\": \"Bulletin 19-6 - Index to Mining History - Vol. 19 Nos. 1-6\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-6%20-%20Index%20to%20Mining%20History%20-%20Vol.%2019%20Nos.%201-6.pdf\" }, { \"title\": \"Bulletin 19-6 - Quarrying Chert at Bakewell - A Detailed Archaeological Survey of Pretoria Mine and Observations on Holme Bank, Holme Hall and Endcliffe Mines\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2019-6%20-%20Quarrying%20Chert%20at%20Bakewell%20-%20A%20Detailed%20Archaeological%20Survey%20of%20Pretoria%20Mine%20and%20Observations%20on%20Holme%20Bank,%20Holme%20Hall%20and%20Endcliffe%20Mines.pdf\" }, { \"title\": \"Bulletin 20-1 - Ancient Mining Features in the Wigpool Iron Ore Mine, Forest Of Dean, Gloucestershire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-1%20-%20Ancient%20Mining%20Features%20in%20the%20Wigpool%20Iron%20Ore%20Mine,%20Forest%20Of%20Dean,%20Gloucestershire.pdf\" }, { \"title\": \"Bulletin 20-1 - A Smelting Miscellany No. 3\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-1%20-%20A%20Smelting%20Miscellany%20No.%203.pdf\" }, { \"title\": \"Bulletin 20-1 - Clear The Way or Black Hillock Mine, Tideswell Moor, Derbyshire - c. 1711 - 1940s\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-1%20-%20Clear%20The%20Way%20or%20Black%20Hillock%20Mine,%20Tideswell%20Moor,%20Derbyshire%20-%20c.%201711%20-%201940s.pdf\" }, { \"title\": \"Bulletin 20-1 - Mining a Globalized World - Local Impacts and International Linkages of the British Exploitation of the Cerro Muriano Mine (Spain, 1897-1919)\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-1%20-%20Mining%20a%20Globalized%20World%20-%20Local%20Impacts%20and%20International%20Linkages%20of%20the%20British%20Exploitation%20of%20the%20Cerro%20Muriano%20Mine%20(Spain,%201897-1919).pdf\" }, { \"title\": \"Bulletin 20-1 - The Ecton Mines 1880s Dressing Shed Archaeological Evaluation Excavations - November-December 2015\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-1%20-%20The%20Ecton%20Mines%201880s%20Dressing%20Shed%20Archaeological%20Evaluation%20Excavations%20-%20November-December%202015.pdf\" }, { \"title\": \"Bulletin 20-2 - Watergrove Mine, Foolow, Derbyshire - Excavating a 1794-95 Newcomen Engine House and a History of the Mine\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-2%20-%20Watergrove%20Mine,%20Foolow,%20Derbyshire%20-%20Excavating%20a%201794-95%20Newcomen%20Engine%20House%20and%20a%20History%20of%20the%20Mine.pdf\" }, { \"title\": \"Bulletin 20-3 - Mandale Mine, Lathkill Dale, Over Haddon, Derbyshire - Survey and Interpretation\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-3%20-%20Mandale%20Mine,%20Lathkill%20Dale,%20Over%20Haddon,%20Derbyshire%20-%20Survey%20and%20Interpretation.pdf\" }, { \"title\": \"Bulletin 20-3 - Quarrying Black Marble at Ashford - A Detailed Archaeological Survey of Rookery and Arrock Mines, with an Outline History of Extraction\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-3%20-%20Quarrying%20Black%20Marble%20at%20Ashford%20-%20A%20Detailed%20Archaeological%20Survey%20of%20Rookery%20and%20Arrock%20Mines,%20with%20an%20Outline%20History%20of%20Extraction.pdf\" }, { \"title\": \"Bulletin 20-3 - The Daisy Knowl Underground Stone Quarry, Longnor, Staffordshire\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-3%20-%20The%20Daisy%20Knowl%20Underground%20Stone%20Quarry,%20Longnor,%20Staffordshire.pdf\" }, { \"title\": \"Bulletin 20-4 - A History and Gazetteer of the Lead Mines upon Eyam Edge, Derbyshire - 1711-1940\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-4%20-%20A%20History%20and%20Gazetteer%20of%20the%20Lead%20Mines%20upon%20Eyam%20Edge,%20Derbyshire%20-%201711-1940.pdf\" }, { \"title\": \"Bulletin 20-4 - A Smelting Miscellany No. 4 Sargill Lead Smelting Mill and the Development of the Ore Hearth\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-4%20-%20A%20Smelting%20Miscellany%20No.%204%20Sargill%20Lead%20Smelting%20Mill%20and%20the%20Development%20of%20the%20Ore%20Hearth.pdf\" }, { \"title\": \"Bulletin 20-4 - Coal Mining Near Buxton - Dane, Blackclough and Knotbury Collieries\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-4%20-%20Coal%20Mining%20Near%20Buxton%20-%20Dane,%20Blackclough%20and%20Knotbury%20Collieries.pdf\" }, { \"title\": \"Bulletin 20-4 - The Coal Mines of Bugsworth, Beard and Ollersett Moors\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-4%20-%20The%20Coal%20Mines%20of%20Bugsworth,%20Beard%20and%20Ollersett%20Moors.pdf\" }, { \"title\": \"Bulletin 20-5 - Excavations at Watts Shaft, Old Mill Close Mine, 1973-1981\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-5%20-%20Excavations%20at%20Watts%20Shaft,%20Old%20Mill%20Close%20Mine,%201973-1981.pdf\" }, { \"title\": \"Bulletin 20-5 - Longcliffe Mine, Castleton Liberty The Recorded History\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-5%20-%20Longcliffe%20Mine,%20Castleton%20Liberty%20The%20Recorded%20History.pdf\" }, { \"title\": \"Bulletin 20-5 - Maps and Sections of a Silver-Lead Mine at Combe Martin, Devon\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-5%20-%20Maps%20and%20Sections%20of%20a%20Silver-Lead%20Mine%20at%20Combe%20Martin,%20Devon.pdf\" }, { \"title\": \"Bulletin 20-5 - The Re-opening of Longcliffe Mine, Castleton\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-5%20-%20The%20Re-opening%20of%20Longcliffe%20Mine,%20Castleton.pdf\" }, { \"title\": \"Bulletin 20-6 - A History and Gazetteer of the Lead Mines around the Village Of Eyam. 1587 - 1988\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-6%20-%20A%20History%20and%20Gazetteer%20of%20the%20Lead%20Mines%20around%20the%20Village%20Of%20Eyam.%201587%20-%201988.pdf\" }, { \"title\": \"Bulletin 20-6 - The Restoration of the Deep Ecton Level Entrance in October to November 2018\", \"url\": \"https://pdmhs.co.uk/MiningHistory/Bulletin%2020-6%20-%20The%20Restoration%20of%20the%20Deep%20Ecton%20Level%20Entrance%20in%20October%20to%20November%202018.pdf\" } ] }","hrefs":["Publications","<a href=\"https://Underfoot.info/Q130384158\" target=\"_blank\" style=\"color: #28a745;\">Peak District Mines Historical Society</a>","Articles"],"title":"Articles","is_collection":true},{"host":"","i1":"","i2":"Q130384158","i3":"","i4":"","i5":"","title1":"Publications","title2":"Peak District Mines Historical Society","title3":"Newsletters 1959-1975","title4":"","title5":"","keywords":"England, mining","offset":"0","url":"https://pdmhs.co.uk/newsletter-archives-series-1-1959-to-1975","scope":"2","refresh":"0","thumb":"","metadata":"{ \"type\": \"collection\", \"date\": \"2026-01-23\", \"items\": [ { \"title\": \"01_January_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/01_January_1962.pdf\" }, { \"title\": \"02_February_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/02_February_1962.pdf\" }, { \"title\": \"03_April_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/03_April_1962.pdf\" }, { \"title\": \"04_June_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/04_June_1962.pdf\" }, { \"title\": \"05_August_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/05_August_1962.pdf\" }, { \"title\": \"06_September_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/06_September_1962.pdf\" }, { \"title\": \"07_October_1962\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/07_October_1962.pdf\" }, { \"title\": \"08_January_1963\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/08_January_1963.pdf\" }, { \"title\": \"09_March_1963\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/09_March_1963.pdf\" }, { \"title\": \"10_May_1963\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/10_May_1963.pdf\" }, { \"title\": \"11_June_1963\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/11_June_1963.pdf\" }, { \"title\": \"12_September_1963\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/12_September_1963.pdf\" }, { \"title\": \"13_October_1963\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/13_October_1963.pdf\" }, { \"title\": \"14_February_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/14_February_1964.pdf\" }, { \"title\": \"15_February_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/15_February_1964.pdf\" }, { \"title\": \"16_April_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/16_April_1964.pdf\" }, { \"title\": \"17_May_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/17_May_1964.pdf\" }, { \"title\": \"18_May_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/18_May_1964.pdf\" }, { \"title\": \"19_July_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/19_July_1964.pdf\" }, { \"title\": \"20_September_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/20_September_1964.pdf\" }, { \"title\": \"21_October_1964\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/21_October_1964.pdf\" }, { \"title\": \"22_January_1965\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/22_January_1965.pdf\" }, { \"title\": \"23_April_1965\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/23_April_1965.pdf\" }, { \"title\": \"24_April_1965\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/24_April_1965.pdf\" }, { \"title\": \"25_June_1965\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/25_June_1965.pdf\" }, { \"title\": \"Circular_1_1960\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Circular_1_1960.pdf\" }, { \"title\": \"Circular_2_May_1960\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Circular_2_May_1960.pdf\" }, { \"title\": \"Circular_3_August_1960\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Circular_3_August_1960.pdf\" }, { \"title\": \"Circular_4_October_1960\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Circular_4_October_1960.pdf\" }, { \"title\": \"Field_Meeting_1_June_1959\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Field_Meeting_1_June_1959.pdf\" }, { \"title\": \"Field_Meeting_2_July_1959\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Field_Meeting_2_July_1959.pdf\" }, { \"title\": \"Field_Meeting_3_May_1960\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Field_Meeting_3_May_1960.pdf\" }, { \"title\": \"Field_Meeting_4_November_1960\", \"url\": \"https://pdmhs.co.uk/wp-content/uploads/simple-file-list/Field_Meeting_4_November_1960.pdf\" } ] }","hrefs":["Publications","<a href=\"https://Underfoot.info/Q130384158\" target=\"_blank\" style=\"color: #28a745;\">Peak District Mines Historical Society</a>","Newsletters 1959-1975"],"title":"Newsletters 1959-1975","is_collection":true},{"host":"","i1":"","i2":"Q130384158","i3":"","i4":"","i5":"","title1":"Publications","title2":"Peak District Mines Historical Society","title3":"UK Mines in 1896","title4":"","title5":"","keywords":"England, mining","offset":"0","url":"https://pdmhs.co.uk/uk-mines-in-1896","scope":"2","refresh":"0","thumb":"","metadata":"{ \"type\": \"collection\", \"date\": \"2026-01-23\", \"items\": [ { \"title\": \"derbyshire-coal-mines-in-1896\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/derbyshire-coal-mines-in-1896.pdf\" }, { \"title\": \"derbyshire-metalliferous-mines-in-1896\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/derbyshire-metalliferous-mines-in-1896.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Antrim\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Antrim.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Kilkenney\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Kilkenney.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Queens County\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Queens%20County.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Roscommon\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Roscommon.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Sligo\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Sligo.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Tipperary\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Tipperary.pdf\" }, { \"title\": \"ireland \u2013 coal 1896 Tyrone\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/ireland%20-%20coal%201896%20Tyrone.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Antrim\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Antrim.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Cork\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Cork.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Donegal\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Donegal.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Down\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Down.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Galway\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Galway.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Sligo\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Sligo.pdf\" }, { \"title\": \"Ireland \u2013 metal 1896 Wicklow\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/Ireland%20-%20metal%201896%20Wicklow.pdf\" }, { \"title\": \"midlands -coal 1896 Cheshir\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/midlands%20-coal%201896%20Cheshir.pdf\" }, { \"title\": \"midlands -coal 1896 Derbys\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/midlands%20-coal%201896%20Derbys.pdf\" }, { \"title\": \"midlands -coal 1896 Leicest\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/midlands%20-coal%201896%20Leicest.pdf\" }, { \"title\": \"midlands -coal 1896 N Staff\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/midlands%20-coal%201896%20N%20Staff.pdf\" }, { \"title\": \"scot-coal 1896 Argyleshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Argyleshire.pdf\" }, { \"title\": \"scot-coal 1896 Ayrshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Ayrshire.pdf\" }, { \"title\": \"scot-coal 1896 Clackmannan\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Clackmannan.pdf\" }, { \"title\": \"scot-coal 1896 Dumbartonshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Dumbartonshire.pdf\" }, { \"title\": \"scot-coal 1896 Dumfriesshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Dumfriesshire.pdf\" }, { \"title\": \"scot-coal 1896 Edinburgh\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Edinburgh.pdf\" }, { \"title\": \"scot-coal 1896 Fife\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Fife.pdf\" }, { \"title\": \"scot-coal 1896 Haddington\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Haddington.pdf\" }, { \"title\": \"scot-coal 1896 Kinross\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Kinross.pdf\" }, { \"title\": \"scot-coal 1896 Lanark\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Lanark.pdf\" }, { \"title\": \"scot-coal 1896 Lanarkshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Lanarkshire.pdf\" }, { \"title\": \"scot-coal 1896 Linlithgow\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Linlithgow.pdf\" }, { \"title\": \"scot-coal 1896 Peebles\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Peebles.pdf\" }, { \"title\": \"scot-coal 1896 Renfrewshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Renfrewshire.pdf\" }, { \"title\": \"scot-coal 1896 Stirlingshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Stirlingshire.pdf\" }, { \"title\": \"scot-coal 1896 Stirlingshire 2\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Stirlingshire%202.pdf\" }, { \"title\": \"scot-coal 1896 Sutherland\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-coal%201896%20Sutherland.pdf\" }, { \"title\": \"scot-metal 1896 Argyleshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Argyleshire.pdf\" }, { \"title\": \"scot-metal 1896 Ayrshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Ayrshire.pdf\" }, { \"title\": \"scot-metal 1896 Dumfriesshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Dumfriesshire.pdf\" }, { \"title\": \"scot-metal 1896 Edinburgh\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Edinburgh.pdf\" }, { \"title\": \"scot-metal 1896 Fife\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Fife.pdf\" }, { \"title\": \"scot-metal 1896 Kirkcudbrightshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Kirkcudbrightshire.pdf\" }, { \"title\": \"scot-metal 1896 Lanark\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Lanark.pdf\" }, { \"title\": \"scot-metal 1896 Lanarkshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Lanarkshire.pdf\" }, { \"title\": \"scot-metal 1896 Linlithgow\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Linlithgow.pdf\" }, { \"title\": \"scot-metal 1896 Renfrewshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Renfrewshire.pdf\" }, { \"title\": \"scot-metal 1896 Shetland\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/scot-metal%201896%20Shetland.pdf\" }, { \"title\": \"South coal 1896 Devonshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20coal%201896%20Devonshire.pdf\" }, { \"title\": \"South coal 1896 Kent\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20coal%201896%20Kent.pdf\" }, { \"title\": \"South coal 1896 Somerset\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20coal%201896%20Somerset.pdf\" }, { \"title\": \"South Fullers Earth 1896 Bedfordshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20Fullers%20Earth%201896%20Bedfordshire.pdf\" }, { \"title\": \"South metal 1896 berkshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20berkshire.pdf\" }, { \"title\": \"South metal 1896 Buckinghamshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Buckinghamshire.pdf\" }, { \"title\": \"South metal 1896 Cornwall\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Cornwall.pdf\" }, { \"title\": \"South metal 1896 Devonshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Devonshire.pdf\" }, { \"title\": \"South metal 1896 Dorset clay\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Dorset%20clay.pdf\" }, { \"title\": \"South metal 1896 Dorset Purbeck\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Dorset%20Purbeck.pdf\" }, { \"title\": \"South metal 1896 Glocestershire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Glocestershire.pdf\" }, { \"title\": \"South metal 1896 Gloucestershire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Gloucestershire.pdf\" }, { \"title\": \"South metal 1896 Hertfordshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Hertfordshire.pdf\" }, { \"title\": \"South metal 1896 Kent\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Kent.pdf\" }, { \"title\": \"South metal 1896 Somerset\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Somerset.pdf\" }, { \"title\": \"South metal 1896 Suffolk\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Suffolk.pdf\" }, { \"title\": \"South metal 1896 Surrey\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Surrey.pdf\" }, { \"title\": \"South metal 1896 Sussex\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Sussex.pdf\" }, { \"title\": \"South metal 1896 Wiltshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20metal%201896%20Wiltshire.pdf\" }, { \"title\": \"South Staffs \u2013 coal 1896\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/South%20Staffs%20-%20coal%201896.pdf\" }, { \"title\": \"wales metal 1896 Anglesea\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Anglesea.pdf\" }, { \"title\": \"wales metal 1896 Breconshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Breconshire.pdf\" }, { \"title\": \"wales metal 1896 Cardiganshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Cardiganshire.pdf\" }, { \"title\": \"wales metal 1896 Carmarthenshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Carmarthenshire.pdf\" }, { \"title\": \"wales metal 1896 Carnarvonshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Carnarvonshire.pdf\" }, { \"title\": \"wales metal 1896 Denbighshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Denbighshire.pdf\" }, { \"title\": \"wales metal 1896 Flintshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Flintshire.pdf\" }, { \"title\": \"wales metal 1896 Glamorganshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Glamorganshire.pdf\" }, { \"title\": \"wales metal 1896 Merionethshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Merionethshire.pdf\" }, { \"title\": \"wales metal 1896 Montgomeryshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Montgomeryshire.pdf\" }, { \"title\": \"wales metal 1896 Radnorshire\", \"url\": \"https://pdmhs.co.uk/docs/1896mines/wales%20metal%201896%20Radnorshire.pdf\" } ] }","hrefs":["Publications","<a href=\"https://Underfoot.info/Q130384158\" target=\"_blank\" style=\"color: #28a745;\">Peak District Mines Historical Society</a>","UK Mines in 1896"],"title":"UK Mines in 1896","is_collection":true}]},"Video":{"is_collection":true,"hrefs":["Video","Adventure 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Dig\",\"duration\":\"11:09\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=dRlWWRglSoQ\",\"date\":\"\"},{\"title\":\"Ep. 20 REDHOUSE - Close to Symonds Yat\",\"duration\":\"7:39\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Fzhk4p45c4U\",\"date\":\"\"},{\"title\":\"Ep 19 HIDDEN EARTH SPECIAL\",\"duration\":\"12:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=2fHw6ff3s6E\",\"date\":\"\"},{\"title\":\"Ep 18: REDHOUSE - SUMMER UPDATE. Cave Rescue Planning, Moving Boulders, BBC News, Exploration\",\"duration\":\"17:33\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=rF9h9Cr8eO0\",\"date\":\"\"},{\"title\":\"Kiln Piece Hole to Wetsink - The first ever through trip in Slaughter Stream Cave, Forest of Dean\",\"duration\":\"25:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=z3HWLFzOHXU\",\"date\":\"\"},{\"title\":\"Pirate Passage to KPH?\",\"duration\":\"17:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=2XkQJFrkYI8\",\"date\":\"\"},{\"title\":\"Ep. 17 - REDHOUSE - The High North & 10+Km!\",\"duration\":\"21:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=mKbOInRoCok\",\"date\":\"\"},{\"title\":\"Mud Duck Reel\",\"duration\":\"30\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=UWilLk9oiok\",\"date\":\"\"},{\"title\":\"Ep. 16 - REDHOUSE - Back to The Wild West\",\"duration\":\"10:31\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Wuh7r87rn0E\",\"date\":\"\"},{\"title\":\"Ep. 15 - REDHOUSE - Into The Void\",\"duration\":\"18:36\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=WxHLr8X2_I8\",\"date\":\"\"},{\"title\":\"Ep. 14 - REDHOUSE - RETURN TO THE MARBLE RIVER\",\"duration\":\"14:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=wGsTEtAc77E\",\"date\":\"\"},{\"title\":\"Ep. 13 - Redhouse - Lhasa Rifts & Paleo Paradise\",\"duration\":\"21:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=p8QEhUJkFJU\",\"date\":\"\"},{\"title\":\"Ep. 12: Redhouse - Calcite & Consolidation\",\"duration\":\"5:47\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=S9m_xZuT5Uo\",\"date\":\"\"},{\"title\":\"Ep. 4: REDHOUSE - THE MARBLE RIVER\",\"duration\":\"13:22\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=SE_HVGWogpk\",\"date\":\"\"},{\"title\":\"Ep. 11: REDHOUSE - Following The Stream\",\"duration\":\"12:45\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=mWz_kle8m6k\",\"date\":\"\"},{\"title\":\"Ep. 10: Redhouse - Calling For The Crow\",\"duration\":\"14:28\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=6moizS1lW4E\",\"date\":\"\"},{\"title\":\"LOCH MORAR TO LOCH NEVIS - A FAMILY CANOE EXPEDITION\",\"duration\":\"24:33\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JS1sSrU03Io\",\"date\":\"\"},{\"title\":\"Ep. 9: REDHOUSE - BEYOND HOWLING HOLE\",\"duration\":\"16:22\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=4emhJLdErDs\",\"date\":\"\"},{\"title\":\"Ep. 8: REDHOUSE - The White Forest & Stream Pitch\",\"duration\":\"19:40\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Vfeh61Rchs8\",\"date\":\"\"},{\"title\":\"Ep 7: REDHOUSE - Disappointment & Consolation\",\"duration\":\"20:50\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=rYg1-2SoAUs\",\"date\":\"\"},{\"title\":\"Ep. 6: REDHOUSE - The Chocolate River\",\"duration\":\"24:54\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=aW6zRo76CN4\",\"date\":\"\"},{\"title\":\"Ep. 5: REDHOUSE - Wicked Pitch of The 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New Lost mine Explored!\",\"duration\":\"16:37\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=i6-rNik2_kU\",\"date\":\"\"},{\"title\":\"Large abandoned Slate Mine Explore with ROV footage of history underwater\",\"duration\":\"32:37\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=vkDkp0Pth2s\",\"date\":\"\"},{\"title\":\"FOUND abandoned 1700's mine workings scattered in the woods\",\"duration\":\"15:13\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=2klGeYFB8dk\",\"date\":\"\"},{\"title\":\"Abandoned 1920\\u2019s mine\",\"duration\":\"26:04\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=URkF3IIfz1U\",\"date\":\"\"},{\"title\":\"Exploring In a Welsh GOLD Mine!\",\"duration\":\"21:40\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ApvhnCiXB_c\",\"date\":\"\"},{\"title\":\"We attempt to explore flooded mine in hopes for a New Level\",\"duration\":\"24:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=DG6dqIWPTN4\",\"date\":\"\"},{\"title\":\"We take Geologists for a SWIM into the Lost Pearl Mine, AMAZING Science Revealed\",\"duration\":\"24:35\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=AqiVMt5ZeWU\",\"date\":\"\"},{\"title\":\"MEGA Slate Mine exploration with the ROV and Wonderful History Shared!\",\"duration\":\"26:52\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=_OV5yKECUx8\",\"date\":\"\"},{\"title\":\"Brilliant 1600s coffin level with AMAZING ENGRAVINGS discovered in Lost Mine Explore!\",\"duration\":\"26:51\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=PddxlJOcTHU\",\"date\":\"\"},{\"title\":\"We take \",\"duration\":\"Chill Bill \",\"url\":\"Si-finds Thames Mudlark on an underground adventure to find sunken treasures\",\"date\":\"\"},{\"title\":\"UnderWater at the Famous Car Cave? We take \",\"duration\":\"sifinds to explore\",\"url\":\"21:40\",\"date\":\"\"},{\"title\":\"Amazing finds in Museum Lost Mine, Deleted scenes from the BBC 1 Documentary\",\"duration\":\"28:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=g6oEIAFsqW0\",\"date\":\"\"},{\"title\":\"WOW! Unbelievable Underground Formations Discovered In Abandoned LOST Mine!\",\"duration\":\"14:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=QIFX6NO8U5U\",\"date\":\"\"},{\"title\":\"A FIRST for Us! Unbelievable Discoveries In Lost Mine Exploration - You Won't Believe What We Found!\",\"duration\":\"17:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=1uHZRWMRrdg\",\"date\":\"\"},{\"title\":\"After Months of DIGGING its finally OPEN! Check out what we FOUND!\",\"duration\":\"18:12\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ak-zWplzgNo\",\"date\":\"\"},{\"title\":\"Discover This Deep Lost Mine Of Curiosities Filled With Artifacts To Unearth\",\"duration\":\"14:22\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=vkYqJLH6QaI\",\"date\":\"\"},{\"title\":\"Exploring A Lost Mine: Lighting Tallow Candles And Reliving The Old Miner's World Underground\",\"duration\":\"14:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=J69wttCo_w8\",\"date\":\"\"},{\"title\":\"Unbelievable Discovery: Stunning Pearls Unearthed In Abandoned Mine!\",\"duration\":\"10:41\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=xd7WdDbyWgU\",\"date\":\"\"},{\"title\":\"Exploring A Lost Mine: Discovering Old Air Equipment And Tools\",\"duration\":\"12:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=OCuJ2Bx-aQ8\",\"date\":\"\"},{\"title\":\"Exploring Lost Mines With Tallow Candles And Wheel Barrows! Exciting Adventure Awaits!\",\"duration\":\"15:10\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=71UaO6NeTNk\",\"date\":\"\"},{\"title\":\"Welcome to Lost Mines\",\"duration\":\"1:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jxKvTlY_kjU\",\"date\":\"\"},{\"title\":\"Lost Mines BBC TV Documentary dropping NEXT WEEK! Here's the exploration teaser for you all!\",\"duration\":\"2:33\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=YyYwsvDq3aU\",\"date\":\"\"},{\"title\":\"Discovering Treasures In An Abandoned Lead Mine: Uncovering Artifacts Galore!\",\"duration\":\"22:02\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=H4Nqx7yP9VE\",\"date\":\"\"},{\"title\":\"Uncovering Lost Mines: Incredible Rail Systems & Carts Discovered Underground!\",\"duration\":\"16:50\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jC7vIGngxNY\",\"date\":\"\"},{\"title\":\"Breathtaking Colors And Precious Mineral Pearls Found In A Lost Mine\",\"duration\":\"9:21\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=5g4cMU4zh-Q\",\"date\":\"\"},{\"title\":\"Unbelievable Discoveries In Forgotten Lost Mine Using Underwater Drone Rov!\",\"duration\":\"19:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=bPCBv0RC-jY\",\"date\":\"\"},{\"title\":\"Unbelievable Mine Exploration: A Treasure Trove Like No Other!\",\"duration\":\"18:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hBQRf47Kev8\",\"date\":\"\"},{\"title\":\"Unbelievable Discovery: Hidden Mine Uncovered In Plain Sight!\",\"duration\":\"14:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lQftwSk-DcM\",\"date\":\"\"},{\"title\":\"Exploring 1700s Micro Mine With Fascinating Discoveries Beyond The Archway!\",\"duration\":\"12:41\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=txbwRz2jNkQ\",\"date\":\"\"},{\"title\":\"Exploring The False Floor in Waterfall Mine With A ROV - Will We Uncover A New Flooded Level?\",\"duration\":\"15:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hHFtdjKX6-4\",\"date\":\"\"},{\"title\":\"Exploring Abandoned Hideout In Forgotten Mine - Epic Tight Squeeze Adventure!\",\"duration\":\"31:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=YSQwfD0NK1E\",\"date\":\"\"},{\"title\":\"Newly Discovered Mines! Uncharted flooded mines get explored to learn the history.\",\"duration\":\"35:10\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=oWwfNYeUr5E\",\"date\":\"\"},{\"title\":\"Exploring A Friend's Mine With An Rov - Watch It In Action!\",\"duration\":\"18:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=STlZFWvymvI\",\"date\":\"\"},{\"title\":\"Amazing finds in Lost Mines - check out what we discovered!\",\"duration\":\"24:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=KXzGs3goNDQ\",\"date\":\"\"},{\"title\":\"Exploring The Depths Of An Abandoned Flooded Mine\",\"duration\":\"30:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=1ClYHJrrfI4\",\"date\":\"\"},{\"title\":\"Exploration Of A Fascinating Deep Slate Mine With Rov\",\"duration\":\"22:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=y42ykTGH_fM\",\"date\":\"\"},{\"title\":\"Searching Epic Depths Of A Giant Slate Mine Adventure With The Rov\",\"duration\":\"24:06\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=rhkUAfvC85U\",\"date\":\"\"},{\"title\":\"Close Call Alert: Our ROV explore Almost Turned Catastrophic! Doesn't always go as planned.\",\"duration\":\"20:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=xdHkIsBYAM0\",\"date\":\"\"},{\"title\":\"Crawling back in history! Taking the ROV with us!\",\"duration\":\"12:29\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=_Dq6MJemOPA\",\"date\":\"\"},{\"title\":\"The mysterious lost mine ~ What's down there?? New Book Giveaway WINNER picked!\",\"duration\":\"38:16\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=OaLqsdtpae8\",\"date\":\"\"},{\"title\":\"Reopening A Lost, Flooded Mine After 100 Years\",\"duration\":\"28:41\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=J-weAYOOW_w\",\"date\":\"\"},{\"title\":\"Amazing Deep Mine With Rare Pearls! AMAZING Cave Pearl Finds!\",\"duration\":\"42:28\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=7EAf8NdWKPQ\",\"date\":\"\"},{\"title\":\"Stunning Finds Found In A Flooded Mine Shaft & A Sad local story\",\"duration\":\"14:37\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=9QWJ9BHBUas\",\"date\":\"\"},{\"title\":\"REOPENED Lost Mine - 200+ Year Old Mine FOUND ~ First eyes to see after 200 years\",\"duration\":\"20:37\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=-WeXBhTKVC8\",\"date\":\"\"},{\"title\":\"Let's explore a Victorian Old Bottle dump mine. See what we find!\",\"duration\":\"16:54\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=yfEMkS2VqfI\",\"date\":\"\"},{\"title\":\"Step Into the Past: The Vibrant and Historical Journey of a Copper Mine\",\"duration\":\"10:00\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lFWA3HrWOTo\",\"date\":\"\"},{\"title\":\"Uncovering Hidden Depths: Epic R.O.V. and Exploration Adventures in the Copper Mine\",\"duration\":\"9:52\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=UzGm1LLD5qY\",\"date\":\"\"},{\"title\":\"This Copper Mine That Will Amaze You With Its Color And History\",\"duration\":\"13:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=3DtVf8t-GME\",\"date\":\"\"},{\"title\":\"Flooded Winze ROV Exploring! Great times with LOST MINES!\",\"duration\":\"10:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=n9k6tq3CFWc\",\"date\":\"\"},{\"title\":\"Flooded Winze ROV Exploring! SHIP WRECK ROV EXPLORE?\",\"duration\":\"11:30\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=NftEe8cQKco\",\"date\":\"\"},{\"title\":\"This Underground Ladder Climb Is Unbelievable! Then See What We Find!\",\"duration\":\"13:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=GkFKnT1OT2Y\",\"date\":\"\"},{\"title\":\"Amazing Discovery: Incredible Treasures Found In Lost Mines In The Uk!\",\"duration\":\"12:53\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=-IwYADuor1g\",\"date\":\"\"},{\"title\":\"You wont believe the pickaxe we found in this LOST MINE!\",\"duration\":\"11:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=StyhrzYiJPk\",\"date\":\"\"},{\"title\":\"Reopening then ROVing a flooded level and finding Lost History underwater\",\"duration\":\"12:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Pufnc3rpfVQ\",\"date\":\"\"},{\"title\":\"Centuries old Flooded Mine Shafts with Fifish ROV ~ Part three\",\"duration\":\"10:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=PeVqrRaZk80\",\"date\":\"\"},{\"title\":\"Your First Glimpse in Centuries old Flooded Mine Shafts with Fifish ROV ~ Second Part\",\"duration\":\"12:54\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jJThgRx9UqU\",\"date\":\"\"},{\"title\":\"Exploring the Depths: Our First Glimpse in Centuries into Flooded Mine Shafts with ROV\",\"duration\":\"21:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=CxAizhSZjmg\",\"date\":\"\"},{\"title\":\"You WONT Believe what we found deeper in LOST MINE! The best find ever!\",\"duration\":\"11:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=uwjOsbPKFcU\",\"date\":\"\"},{\"title\":\"Best find EVER! AMAZING Underground Intact water wheel Found! 1 of 3 in UK ~ Final Part\",\"duration\":\"15:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=2qZDrk5iVJc\",\"date\":\"\"},{\"title\":\"Reopening Lost Mine, FOUND VERY RARE welsh history item! Second Part\",\"duration\":\"16:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Nz_bblCozHc\",\"date\":\"\"},{\"title\":\"Reopening Lost Mine, FOUND VERY RARE Historical FIND deep underground First Part\",\"duration\":\"16:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Q8lXfXlmSEY\",\"date\":\"\"},{\"title\":\"Amazing deep Flooded mine chamber Gets ROV'd part three\",\"duration\":\"22:43\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=7gkn5hxUbc0\",\"date\":\"\"},{\"title\":\"Fantastic ROV Exploration in abandoned slate mine Second Part\",\"duration\":\"10:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=8he8F4l8qhY\",\"date\":\"\"},{\"title\":\"FIFISH V6 Expert ROV Exploration in a slate mine First Part\",\"duration\":\"13:49\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JDYENxIfvD8\",\"date\":\"\"},{\"title\":\"Silver Mountain Museum mine Adventures Exploring With the ROV!\",\"duration\":\"20:45\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Add_mum7w6Q\",\"date\":\"\"},{\"title\":\"Looking for Lost Mining History Structures along the Creek\",\"duration\":\"7:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=J728ZNItpEI\",\"date\":\"\"},{\"title\":\"Tight Squeeze into a 150yr old MINE ~ amazing LOST mining History!\",\"duration\":\"11:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=NOKW3RS6iBA\",\"date\":\"\"},{\"title\":\"Massive underground winch found in Lost mines\",\"duration\":\"11:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=_-5J42m3y0E\",\"date\":\"\"},{\"title\":\"FLOODED MINE ROV Last Seen in the 1800's MANY LEVELS FOUND!\",\"duration\":\"16:02\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=UglD0Ws-DXI\",\"date\":\"\"},{\"title\":\"Back out IN FLOODED MINES with the QySEA ROV FIFISH V6 EXPERT!\",\"duration\":\"16:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=c1F-nUBH5_c\",\"date\":\"\"},{\"title\":\"New UNEXPLORED mine leads to NEW FINDS ~ More artifact remains found\",\"duration\":\"10:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=w-M8DzLJIFQ\",\"date\":\"\"},{\"title\":\"Nice to be back! New UNEXPLORED mine ~ Ioan working on SECRET project!\",\"duration\":\"18:55\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=CAcS2bRlLLo\",\"date\":\"\"},{\"title\":\"MORE Coffin levels FOUND in medieval Abandoned mine! NEW ROV SITE!\",\"duration\":\"8:06\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=up8Hiqmqllk\",\"date\":\"\"},{\"title\":\"AMAZING Abandoned Medieval Coffin level LOST MINE explored!\",\"duration\":\"13:52\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=WUzg-RnJt2A\",\"date\":\"\"},{\"title\":\"Coffin levels FOUND medieval Abandoned mine explored! Great FINDS\",\"duration\":\"13:26\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=b8-kNnKV5-M\",\"date\":\"\"},{\"title\":\"AMAZING Mining History In Beautiful Welsh hills! FOUND amazing LOST Mines!\",\"duration\":\"12:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Fy9hn4ScZ2o\",\"date\":\"\"},{\"title\":\"Found HIDDEN Shelf full of SURPRISE ANTIQUES of Welsh mining history!\",\"duration\":\"9:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=uQ16sIvFNFY\",\"date\":\"\"},{\"title\":\"Would ya LOOK AT THAT! AMAZING flooded Mine shaft finds!\",\"duration\":\"16:53\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=SYvBYWQqC6E\",\"date\":\"\"},{\"title\":\"UNDERWATER EXPLORE Amazing FINDS in Flooded lost mine\",\"duration\":\"16:45\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=NmmgYWy4-Os\",\"date\":\"\"},{\"title\":\"NEW Fifishv6 EXPERT Underwater DRONE! lets go reopen flooded levels!\",\"duration\":\"16:28\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=og82cc_c9HM\",\"date\":\"\"},{\"title\":\"First to SEE lost mine Artifacts in 162yrs! Amazing FINDS!\",\"duration\":\"12:36\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ZoCYdy5eYa4\",\"date\":\"\"},{\"title\":\"REOPENED 162yr After Collapse CONTINUES! First LOOK SINCE 1860!\",\"duration\":\"13:30\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=TbLqOstKWPk\",\"date\":\"\"},{\"title\":\"REOPENED 162yr After Collapse! First to SEE mine SINCE 1860! SO EXCITING!\",\"duration\":\"18:40\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=z9e9HdpHQJs\",\"date\":\"\"},{\"title\":\"Toughest ROV Yet! Flooded MINE w\\/t cloudy water MAKING IT HARD\",\"duration\":\"16:38\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ggSf0MmYOlw\",\"date\":\"\"},{\"title\":\"Flooded lost mine FOUND! AMAZING artifacts on the way to ROV\",\"duration\":\"11:31\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=DlyLl2W-YnQ\",\"date\":\"\"},{\"title\":\"AMAZING FLOODED Mine gets ROVed in fun underwater explore!\",\"duration\":\"23:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jwYV9yF8u_Q\",\"date\":\"\"},{\"title\":\"TRULY AMAZING 150yr old ARCH mine FOUND! OUT of this WORLD!\",\"duration\":\"16:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lOfAi6z755U\",\"date\":\"\"},{\"title\":\"Extremely TIGHT Ladder climbs in amazing DEEP arch mine\",\"duration\":\"13:51\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=kIAtCGM2VR8\",\"date\":\"\"},{\"title\":\"ROV TIME! AMAZING Stone Arched FLOODED Mine gets underwater explore!\",\"duration\":\"15:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=mfLQMVTwxLU\",\"date\":\"\"},{\"title\":\"REOPENED 150yr old MINE ~ amazing LOST mining History!\",\"duration\":\"11:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=1CWfIyYcXvA\",\"date\":\"\"},{\"title\":\"WE REOPENED 150yr old MINE? FOUND amazing LOST History! WE ARE BACK!\",\"duration\":\"14:55\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JcH_sw1KzZw\",\"date\":\"\"},{\"title\":\"150yr old MINES! FOUND amazing LOST artifacts\",\"duration\":\"15:50\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=f6qkLdoaA58\",\"date\":\"\"},{\"title\":\"Amazing Mineral Formations found in Waterfall LOST MINE\",\"duration\":\"11:32\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=4JS6sqHL1MU\",\"date\":\"\"},{\"title\":\"Look what we FOUND on OTHER SIDE ROV ing Flooded Lost Mines\",\"duration\":\"7:21\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=UtjDefAAtHQ\",\"date\":\"\"},{\"title\":\"New Battery & WE GO FARTHER DOWN! ROV ing Flooded Lost Mines\",\"duration\":\"12:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=rvUOiKvU0JA\",\"date\":\"\"},{\"title\":\"OMG! LOOK WHAT WE FOUND ROV ing Flooded Lost Mines\",\"duration\":\"10:12\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=a1sAX1qDOl4\",\"date\":\"\"},{\"title\":\"ROVing Flooded WINZES Brilliant Lost mine Exploration!\",\"duration\":\"13:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=f8_fwRNViH0\",\"date\":\"\"},{\"title\":\"Can't go farther in, we Drop ROV to Explore Flooded Level\",\"duration\":\"12:04\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JOJSLY5CwJ0\",\"date\":\"\"},{\"title\":\"New ROV mine! MANY Artifacts found DEEP underground\",\"duration\":\"20:52\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=N0CcMpUqp6Y\",\"date\":\"\"},{\"title\":\"Running through an Underground Waterfall \\/ Gold hunt continues\",\"duration\":\"13:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=AZVM4-lxgQc\",\"date\":\"\"},{\"title\":\"Lost mines Looking for Lost GOLD ~ ancient mine tests\",\"duration\":\"12:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=SzAcadct6Ys\",\"date\":\"\"},{\"title\":\"AMAZING views as we take GOLD panner to TEST MINE veins!\",\"duration\":\"18:43\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=bQFnA_HCinQ\",\"date\":\"\"},{\"title\":\"Flooded Mine ROV Continues with AMAZING FINDS!\",\"duration\":\"14:40\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hdZWNpHgYlE\",\"date\":\"\"},{\"title\":\"AMAZING ROV FINDS! In GIANT waterwheel flooded mine!\",\"duration\":\"12:45\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=U-OUw2Aq9cM\",\"date\":\"\"},{\"title\":\"ROV GIANT waterwheel mine! What's underwater ~ underground!\",\"duration\":\"13:41\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=b1vp9soOapo\",\"date\":\"\"},{\"title\":\"AMAZING Underground WATERFALL & Perfectly preserved timbers\",\"duration\":\"19:47\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=TFtIkB-ID-U\",\"date\":\"\"},{\"title\":\"Why would they do that? Medieval mining history continues\",\"duration\":\"13:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=72gmcat3KoQ\",\"date\":\"\"},{\"title\":\"How did he fit? Medieval Artifacts found near Lead Mine!\",\"duration\":\"18:45\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=gopE9aBNTWY\",\"date\":\"\"},{\"title\":\"TIGHT fit Throwback ~ how we started! (exploring with AL)\",\"duration\":\"15:41\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=06qOc6obcAo\",\"date\":\"\"},{\"title\":\"WE ROV in flooded mine shafts! 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WOW just WOW\",\"duration\":\"22:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=UIGZXTnePQM\",\"date\":\"\"},{\"title\":\"WOW Lost Mine just KEEPS giving! BOOTS, Tools, & MORE!\",\"duration\":\"15:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=MsOqpIcx5DY\",\"date\":\"\"},{\"title\":\"Artifacts & FROGS found? Unexpected mine keeps on giving!\",\"duration\":\"10:46\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=wMVGCeDja20\",\"date\":\"\"},{\"title\":\"unexpected mine with unexpected finds - awesome artifacts\",\"duration\":\"10:42\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=PENiY4fz1PA\",\"date\":\"\"},{\"title\":\"NEW stope levels & Did we find a HAUNTED Mine Level w\\/ Orbs??\",\"duration\":\"14:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=dQHYtRZkaZk\",\"date\":\"\"},{\"title\":\"NEW mine section OPENED beyond dangerous Traverse line\",\"duration\":\"14:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=QRZhWIm5DmA\",\"date\":\"\"},{\"title\":\"amazing mine opened with dangerous Traverse line installed\",\"duration\":\"11:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=bBYn9zO_3-c\",\"date\":\"\"},{\"title\":\"climbing 120yr old ladders! we FOUND new amazing LOST Mines\",\"duration\":\"21:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=C_Q86hle2ko\",\"date\":\"\"},{\"title\":\"amazing finds, aliens, & long ladders In LOST MINE!\",\"duration\":\"15:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jct_pckZu5Y\",\"date\":\"\"},{\"title\":\"amazing EXPLORE underground at TALLOW candle mine\",\"duration\":\"14:54\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=V0z47gLvoy8\",\"date\":\"\"},{\"title\":\"subscriber goes EXPLORING underground at TALLOW candle mine\",\"duration\":\"14:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=zRXmWWnH03A\",\"date\":\"\"},{\"title\":\"Welsh Mining & Railroad History - Aberystwyth Wales Promenade\",\"duration\":\"16:09\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=BaTH3rQPkfs\",\"date\":\"\"},{\"title\":\"the haunted medieval lost mine - CAN YOU HEAR IT?\",\"duration\":\"15:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jNNqAwUKGr0\",\"date\":\"\"},{\"title\":\"explore DISCO lost mine Pt2 AMAZING Underground COLOURS!\",\"duration\":\"15:22\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=0COAijw2tro\",\"date\":\"\"},{\"title\":\"Come explore DISCO lost mine! AMAZING Underground COLOURS!\",\"duration\":\"15:29\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=A6ANOkU8tGo\",\"date\":\"\"},{\"title\":\"Surprises await in this hole underground! Amazing find!\",\"duration\":\"12:35\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=VWgNeRuJEIM\",\"date\":\"\"},{\"title\":\"what's in this hole underground? Amazing OLD Mine explore!\",\"duration\":\"14:55\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JMlpfmt_z1g\",\"date\":\"\"},{\"title\":\"We are HAND digging out a lost mine! Another great find!\",\"duration\":\"10:13\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=iXkb2EbqRO4\",\"date\":\"\"},{\"title\":\"Rented a BIG Excavator to dig up a LOST MINE! 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Is it our long lost Smelt mill\",\"duration\":\"26:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=IoguShVDs2s\",\"date\":\"\"},{\"title\":\"The Cotton Famine road Coal legacy 2: The Devil Byron's Coal\",\"duration\":\"38:43\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=PEA30hpQRGw\",\"date\":\"\"},{\"title\":\"Nenthead : The Italian Miners riot of 1905 and celebrating the 200th anniversary of the village\",\"duration\":\"31:26\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=bSI3ipdcZnc\",\"date\":\"\"},{\"title\":\"The Last Stand of the Backstand: The pit nobody wanted to work in; Denton Drift.\",\"duration\":\"23:15\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=RaBITtQ1zGE\",\"date\":\"\"},{\"title\":\"Treasures Beneath The Tech: The unique classroom which must be the Worlds only surviving example.\",\"duration\":\"19:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=h_Z6pOZ3vTg\",\"date\":\"\"},{\"title\":\"The Battle of Hogshead Colliery and an introduction into coal mining in Whitworth\",\"duration\":\"30:42\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=78_atcxv6Do\",\"date\":\"\"},{\"title\":\"The Heros of the Roachburn Colliery disaster 1908\",\"duration\":\"49:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Tj3TAiKmFtA\",\"date\":\"\"},{\"title\":\"Rochdale's Industrial Heritage. A walk round important mining remains in Rochdale\",\"duration\":\"28:45\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=s85OGpP85fM\",\"date\":\"\"},{\"title\":\"Carrock Tungsten Mine Cumbria and Mosedale Meeting House\",\"duration\":\"25:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=wB4tOHwgFkw\",\"date\":\"\"},{\"title\":\"Lancashire Mining museum Update\",\"duration\":\"5:27\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=OyhSpOtV0jc\",\"date\":\"\"},{\"title\":\"Pikes, Blacksmiths and Spies: The aftermath of Peterloo in Rossendale October 1819\",\"duration\":\"26:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jXSj0oyYZDo\",\"date\":\"\"},{\"title\":\"Captain Fold Colliery Disaster Heywood 1852\",\"duration\":\"32:54\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=geh76-KdUyM\",\"date\":\"\"},{\"title\":\"James Maden; The Power Loom breaker who became the Gambleside Preacher\",\"duration\":\"51:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=8G-2HmzdKrA\",\"date\":\"\"},{\"title\":\"Looking for an Iron Ore vein in the Langdales Cumbria\",\"duration\":\"9:50\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ovjxt_uXYJs\",\"date\":\"\"},{\"title\":\"Exiting find at the Ancient Broadhead Moor Colliery Burnley.\",\"duration\":\"28:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=a_xTTh6o8yg\",\"date\":\"\"},{\"title\":\"Re enactment of the events on the 25th April 1826 outside Middle Mil Haslingden\",\"duration\":\"6:29\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=keCipwJD26U\",\"date\":\"\"},{\"title\":\"John Kay. his invention that changed the world\",\"duration\":\"45:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Ibas0LUx0Q4\",\"date\":\"\"},{\"title\":\"Tales from The Museum: The Birth Of Hargreaves Burnley Collieries\",\"duration\":\"58:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=thZKNBh5yj8\",\"date\":\"\"},{\"title\":\"Remembering the Roachburn Disaster 117 on from the event. Nic Broomhead reads the official report.\",\"duration\":\"12:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=9tMwYZlq_-0\",\"date\":\"\"},{\"title\":\"The Story of Tom Greenhow, The Blacksmith Poet of Crosby Garett\",\"duration\":\"1:17:01\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=fjQPko5qXIQ\",\"date\":\"\"},{\"title\":\"Rooley moor windfarm. Today we walk the lower slopesof the Cotton Famine road. Coal and Windpower\",\"duration\":\"37:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=v9t0c6OFuOo\",\"date\":\"\"},{\"title\":\"The Old Hartleyburn Colliery. We Found an old shaft on the First edition map and traced it's history\",\"duration\":\"29:33\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=adpaXueq0ds\",\"date\":\"\"},{\"title\":\"Roachburn colliery Disaster: Part 1 The Coal owners and the Birth of a Coalfield.\",\"duration\":\"45:16\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=1doqVv3ccuY\",\"date\":\"\"},{\"title\":\"Samuel Bamfrord's road to Peterloo 1819: Neil Bell explains his roll in Mike Leigh's 2018 film\",\"duration\":\"53:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=CKt0I_7sdsk\",\"date\":\"\"},{\"title\":\"Join your local online History Group and see how you can help others to enjoy History\",\"duration\":\"24:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=McU79meMNYA\",\"date\":\"\"},{\"title\":\"Cotton Famine Road: Coal Legacy Episode 1 Coal Wars. Rooley Moor Rochdale.\",\"duration\":\"40:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=8wusVCk5mn0\",\"date\":\"\"},{\"title\":\"Woodhorn Colliery Museum & New Hartley Memorial Gardens\",\"duration\":\"55:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=nBRdobGtr9k\",\"date\":\"\"},{\"title\":\"Lancashire mining museum with the Lancashire Larks. We visit again with our fave museum guide\",\"duration\":\"12:29\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=7C1ZOy3SN3k\",\"date\":\"\"},{\"title\":\"An industrial History Walk around Baxenden, Goodshaw Hill & Hambleden Hill. Great East Lancs Scenery\",\"duration\":\"28:19\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=y9LBCoxrvU4\",\"date\":\"\"},{\"title\":\"Rooley Moor, A Bank holiday walk around some of the old Coal mining remains\",\"duration\":\"29:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=61cPOF7VGR0\",\"date\":\"\"},{\"title\":\"Tindale 225 Part 2. The beginnings. Talk by Clive Seal on the origins of the Naworth Coalfield\",\"duration\":\"55:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=FKbPd-T2Frs\",\"date\":\"\"},{\"title\":\"Whitworth Vale & Healey Brass band Concert part 1. May 12th 2024 Whitworth.\",\"duration\":\"51:38\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=dB8BvlMRYg4\",\"date\":\"\"},{\"title\":\"Weavers Uprising 198th anniversary celebrations 2\",\"duration\":\"18:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=wAUA-1Ylk_M\",\"date\":\"\"},{\"title\":\"Big Pit. National Mining Museum of Wales....Our Day Out.\",\"duration\":\"26:31\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hnHyW41uaTU\",\"date\":\"\"},{\"title\":\"Burnt Hills Colliery part 1: Today we are invited into Paddy's back garden to see some remains.\",\"duration\":\"34:09\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=tqUbZQhvnDo\",\"date\":\"\"},{\"title\":\"Our Teddy. Edmund 'Teddy' Law. Rossendale collier and international Catch as catch can Wrestler\",\"duration\":\"8:53\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=z3Xut7elMEo\",\"date\":\"\"},{\"title\":\"Burnley's Ancient Colliery. The Broadhead Moor Colliery dating back to 1450\",\"duration\":\"38:10\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=G0OdjS8oZ80\",\"date\":\"\"},{\"title\":\"Hidden History. A forgotten corner of Rawtenstall.\",\"duration\":\"15:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LfuQHJF3-Zc\",\"date\":\"\"},{\"title\":\"A Flooded Valley: Watergrove Near Rochdale. exploring Wall Nook, Foulclough & Hey Clough Collieries\",\"duration\":\"23:15\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=1gCphkJpZB8\",\"date\":\"\"},{\"title\":\"Lakeland Industrial Walks. Honister Slate Mine to Dubs Quarry and Blackbeck Tarn\",\"duration\":\"14:50\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=85qDmSp8ACo\",\"date\":\"\"},{\"title\":\"Underground in a steep coal seam.\",\"duration\":\"4:37\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=QJZE3eb038o\",\"date\":\"\"},{\"title\":\"Just playing around. Hewing first tub in 19 years.\",\"duration\":\"10:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=fsL3RxsEdM8\",\"date\":\"\"},{\"title\":\"Blackpool Rock From Burnley. Ben Bullock & his lettered Rock.\",\"duration\":\"12:16\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=T-wkBXmpt0o\",\"date\":\"\"},{\"title\":\"Tales from the Museum. We visit the National Railway Museum In York and coal mining exhibits\",\"duration\":\"49:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=6CNyM6xzR30\",\"date\":\"\"},{\"title\":\"The Rigging Of England. Up Sharneyford Bacup at George Maxwell's Change Colliery\",\"duration\":\"55:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lvVu96YQ8vU\",\"date\":\"\"},{\"title\":\"Woodend Mining Museum. Unveiling the winding wheel\",\"duration\":\"23:02\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=_pJdjzP99qs\",\"date\":\"\"},{\"title\":\"Three Owd Codgers Oor 't Gambleside. A look round some ruined farms former homes of Industrialists\",\"duration\":\"15:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jiuUu2blfAY\",\"date\":\"\"},{\"title\":\"Further Underground discoveries in Rossendale Lancashire.\",\"duration\":\"6:38\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JmsvDHZZOUY\",\"date\":\"\"},{\"title\":\"Mining History Shorts. The Spewing Duck. Goodshawfold Rossendale\",\"duration\":\"1:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=J7ay21UknFc\",\"date\":\"\"},{\"title\":\"Mining History Shorts. Going Underground 2. East Lancashire\",\"duration\":\"5:31\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=yJCYvRMyPwc\",\"date\":\"\"},{\"title\":\"Pit And Poet :Carr and Craggs Colliery and Flower Scarr near Bacup Lancashire\",\"duration\":\"35:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=HcT0z5mtJsk\",\"date\":\"\"},{\"title\":\"Dean pit short with Chris and Vicky. whilst filming The missing Dean Boys\",\"duration\":\"2:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=5VHgvOzR-CM\",\"date\":\"\"},{\"title\":\"Moorforge Viking Village Cumbria. Moorforge is a growing attraction in Cumbria, well worth a visit.\",\"duration\":\"17:36\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=GCI8MT9tB7A\",\"date\":\"\"},{\"title\":\"Mining History Shorts Rehoboth Chapel GoodshawFold Rossendale.\",\"duration\":\"4:01\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=7WxtiBfBrO8\",\"date\":\"\"},{\"title\":\"Mining History Shorts. Burnt Hills Colliery Clowbridge\",\"duration\":\"1:02\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=FR_0SLs0rH8\",\"date\":\"\"},{\"title\":\"Going Underground in Rossendale. Today we take a trip underground and go back to 1835.\",\"duration\":\"38:47\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=caiDP8VUpg0\",\"date\":\"\"},{\"title\":\"The Rocket at the National Railway Museum Shilden\",\"duration\":\"11:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=-64Xu_-8sH4\",\"date\":\"\"},{\"title\":\"Field Study. The Grand Old Blenkinsopp Colliery Northumberlamd\",\"duration\":\"44:39\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=fSMcQH3ljP8\",\"date\":\"\"},{\"title\":\"Robert Owen at New Lanark Mills. Robert and his Father in-law had a radical view of employment\",\"duration\":\"33:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=pX2-6s_dj6c\",\"date\":\"\"},{\"title\":\"Scout Moor Colliery Field Study. An important mining site is about to disappear into a quarry\",\"duration\":\"19:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=oT22pxoQX8E\",\"date\":\"\"},{\"title\":\"Exciting New Exhibit at Woodend Mining Museum.\",\"duration\":\"5:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LCzplhLwm0Y\",\"date\":\"\"},{\"title\":\"Two Monuments of Ages. Thirllwall. Northumberland. Thirlwall Colliery has some amazing remains\",\"duration\":\"17:55\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=C2jhb6GS5lI\",\"date\":\"\"},{\"title\":\"Woodend Mining Museum. Brian Maden Lectures. The Hapton Valley Explosion\",\"duration\":\"10:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=qxkRFMkTs7g\",\"date\":\"\"},{\"title\":\"Alston Coalfield. Talk given to Alston Moor Historical Society on the Alston Coalfield.\",\"duration\":\"1:06:46\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lSKM6X01oko\",\"date\":\"\"},{\"title\":\"Dukesfield Smelt Mill Northumberland. Quick bait time banter around his ancient historic monument\",\"duration\":\"8:41\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=h_ajNPINWVU\",\"date\":\"\"},{\"title\":\"Boys & Girls Come Out To Play. Hareholme mill Tragedy 1801. Rossendale Lancashire.\",\"duration\":\"17:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=5HRbfSqvLGI\",\"date\":\"\"},{\"title\":\"Snope Burn Colliery and a walk to the Bog. A Lovely little Limekiln South Tyne Valley Northumberland\",\"duration\":\"25:42\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Ndm5vD9dx1M\",\"date\":\"\"},{\"title\":\"Cats Cleugh. A quick video looking for the location of a photograph taken on Alston Moor.\",\"duration\":\"1:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=CiqMxcq-230\",\"date\":\"\"},{\"title\":\"History of the Naworth Coal Lords. Coming soon. Preview of a video we are now working on\",\"duration\":\"4:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=qX7BF1WzZmg\",\"date\":\"\"},{\"title\":\"Rowgill Coal pit at Jail House corner Alston Cumbria. Field Study\",\"duration\":\"29:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=EldgJiPAYGs\",\"date\":\"\"},{\"title\":\"Townley Colliery Burnley. Interview with John Wilson who started at Townley Colliery Burnley aged 14\",\"duration\":\"8:12\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=szXPYFcAjlc\",\"date\":\"\"},{\"title\":\"The Cave Man of Borrowdale. Westmoreland Green Slate. Castle Crag and the Iron Age Fort.\",\"duration\":\"43:27\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=8GeDv7c-Cug\",\"date\":\"\"},{\"title\":\"Nabb Colliery Rossendale. Drone flight along the surface remains.\",\"duration\":\"9:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=F0L90g7bKm4\",\"date\":\"\"},{\"title\":\"\",\"duration\":\"The Last Pit . Along with Nic Broomhead and Jez Cooper we visit the Norths last working colliery.\",\"url\":\"20:02\",\"date\":\"\"},{\"title\":\"Woodend Mining Museum Burnley Carol is interviewed on Radio Lancashire\",\"duration\":\"4:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=EcyBCntXXyg\",\"date\":\"\"},{\"title\":\"Training Daze. Get Sum In. Leaving School in 1980 and starting with the NCB\",\"duration\":\"57:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=cv2pKJ_Wkbk\",\"date\":\"\"},{\"title\":\"Hartside Colliery By Drone. Attempt 1. Near Alston Cumbria\",\"duration\":\"5:47\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Dz3EfCXexco\",\"date\":\"\"},{\"title\":\"William pit Whithaven Cumbria On the 75th Anniversary of the 1947 Disaster 15th August 1947.\",\"duration\":\"20:35\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ANVoOi0Vu04\",\"date\":\"\"},{\"title\":\"Hill Top Last Pit In Lancashire.\",\"duration\":\"29:06\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=KyYNc2rJlUM\",\"date\":\"\"},{\"title\":\"Lomax Wood Colliery disaster Bury- Heywood 1834. A deadly inrush of water with 23 lives in danger.\",\"duration\":\"47:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hfhyYPsNvQA\",\"date\":\"\"},{\"title\":\"Whitehaven Beacon and Saltom Pit. A walk around the museum and a check of the colliery site\",\"duration\":\"5:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=h23UGVvmG3U\",\"date\":\"\"},{\"title\":\"Hapton Valley Colliery Burnley. Location of Old Steam driven fan dating 1891\",\"duration\":\"19:57\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=NNj4QvP2yxc\",\"date\":\"\"},{\"title\":\"Burnley Mining Museum. Woodend Colliery at Smithson Farm\",\"duration\":\"25:51\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=PEZZRjS4ROc\",\"date\":\"\"},{\"title\":\"Barhaugh Colliery part 2. The Last of the Prospectors. 1950-2000. Coal mine near Alston\",\"duration\":\"54:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=y1NZxz3EM28\",\"date\":\"\"},{\"title\":\"The Hungarian Refuge Miners who fled to Great Britain following the Uprising against Soviet Rule\",\"duration\":\"55:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=eh8fXiHvLHU\",\"date\":\"\"},{\"title\":\"Death By washing Line in Bacup & The Shroud of Goodshaw. Rossendale Lancashire\",\"duration\":\"16:52\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=HylZd75fsJ8\",\"date\":\"\"},{\"title\":\"Field walk along Stanhope Burn Mine and Smelt mill up To Rookhope and Groverake mine\",\"duration\":\"22:36\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=okwpv7yhDCU\",\"date\":\"\"},{\"title\":\"Tindale Fell Waggonway 2. Col mine. Cumbria, Shop Pit, Peters Hole, Duke Pit , Henry pit\",\"duration\":\"7:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=g0jnEz8bRmI\",\"date\":\"\"},{\"title\":\"Tindale Fell Waggonway. Brampton Cumbria. Short Field Study\",\"duration\":\"31:09\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=EyUQAbMqd5c\",\"date\":\"\"},{\"title\":\"Swinshaw Colliery History and Field Study. of this old coal mine\",\"duration\":\"57:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=BJwVtiQKIsY\",\"date\":\"\"},{\"title\":\"Clargill Colliery Old Linger Pit Alston Cumbria. Field Study\",\"duration\":\"23:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JBcoLuocdHs\",\"date\":\"\"},{\"title\":\"The Kiln Fields. A Tale of Two Tragedies. Alston Moor Cumbria\",\"duration\":\"28:10\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=XIqesb9KEdE\",\"date\":\"\"},{\"title\":\"Hartside Colliery Cumbria. Field Study\",\"duration\":\"12:06\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=8_Rtn5ddZxQ\",\"date\":\"\"},{\"title\":\"Tommy Helm Of Rossendale. Grimebridge. Deerplay & Inchfield Moor Colliery\",\"duration\":\"3:02\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hyOQyLPxvfk\",\"date\":\"\"},{\"title\":\"Bait Time Banter: Colliers and the Demon Drink 1847.\",\"duration\":\"15:22\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=exIUSma6VFo\",\"date\":\"\"},{\"title\":\"field study Old Sink and Mill Moor Collieries Rooley Moor Lancashire\",\"duration\":\"32:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=p5EM1XPvdkI\",\"date\":\"\"},{\"title\":\"Longfell Mine, Warcop. Newsreel footage from 1949\",\"duration\":\"1:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=rfVr2KcFqd4\",\"date\":\"\"},{\"title\":\"Rooley Moor Collieries Field study.1 Intake, Part Bank and Ashworth's Mill Moor.\",\"duration\":\"21:52\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LIw4wL5P2xM\",\"date\":\"\"},{\"title\":\"Bait Time Banter: Rumours of my Death. December 1866\",\"duration\":\"7:03\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=m5vS1dahSpM\",\"date\":\"\"},{\"title\":\"Astley Green Colliery Lancashire Mining Museum\",\"duration\":\"36:19\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=c8DPWn4CQPY\",\"date\":\"\"},{\"title\":\"Gin Pit Village. Walking Industrial History Black Holes and Silver Screens\",\"duration\":\"29:59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=jl33r32fZXs\",\"date\":\"\"},{\"title\":\"Hapton Valley Colliery closure\",\"duration\":\"3:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LarROf1YD_o\",\"date\":\"\"},{\"title\":\"space house. 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A visit from the One-Legged Miner.\",\"duration\":\"12:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=kTm8n8Y_dzk\",\"date\":\"\"},{\"title\":\"One-Legged Miner has a Mother?\",\"duration\":\"2:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hgSVdsX9DJk\",\"date\":\"\"},{\"title\":\"Mine dogs gotta be dogs\",\"duration\":\"4:38\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=uStIbs2GynI\",\"date\":\"\"},{\"title\":\"Desert Military Vehicle find\\u2014a Willys Jeep!\",\"duration\":\"13:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=fsxmXjKUhyk\",\"date\":\"\"},{\"title\":\"Inspecting the Columbia shaft by carbide lamp\",\"duration\":\"23:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=eoGbrjBGugI\",\"date\":\"\"},{\"title\":\"Stupid truck trick cuts road to Tecopa\",\"duration\":\"6:11\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=awDqmgUGvt0\",\"date\":\"\"},{\"title\":\"The Great Hilary Tecopa flood\\u2026with special guests!\",\"duration\":\"11:17\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=gE4p_1f58ag\",\"date\":\"\"},{\"title\":\"Hurricane Hilary comes to Tecopa Mines. Part 3. Status Report.\",\"duration\":\"1:53\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=kAk-5hEOMc0\",\"date\":\"\"},{\"title\":\"Hurricane Hilary comes to Tecopa Mines. Part Two. (The waiting game)\",\"duration\":\"3:46\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=uLBX_FKamzk\",\"date\":\"\"},{\"title\":\"Hurricane Hilary comes to Tecopa Mines. Part 1\",\"duration\":\"4:26\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=q14wxtEvtAs\",\"date\":\"\"},{\"title\":\"How the one-legged miner came to be\",\"duration\":\"21:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=DaFhN0G9x-4\",\"date\":\"\"},{\"title\":\"Goldfield Days. Celebrating Nevada\\u2019s Mining History With Friends.\",\"duration\":\"16:28\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=2gd7KKGeDXI\",\"date\":\"\"},{\"title\":\"What was and what\\u2019s left. What happened when the mines closed?\",\"duration\":\"12:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=-tC319GxaHo\",\"date\":\"\"},{\"title\":\"Into the depths of the War Eagle with friends.\",\"duration\":\"21:30\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=gHPbNAOy-_8\",\"date\":\"\"},{\"title\":\"Visited Cerro Gordo and met Brent Underwood\",\"duration\":\"4:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=GvH3-I3U2sI\",\"date\":\"\"},{\"title\":\"Down on the Border. It\\u2019s changed.\",\"duration\":\"15:58\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=kqV8vLPEFq8\",\"date\":\"\"},{\"title\":\"Off to Mexico for a few days.\",\"duration\":\"16:00\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=EVBRwNeeK88\",\"date\":\"\"},{\"title\":\"Hiking around on the surface\",\"duration\":\"18:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Rlxz_PKBMxk\",\"date\":\"\"},{\"title\":\"Finally! New ladder in and down to the rolling cars of Columbia!\",\"duration\":\"30:21\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=7K2LF_OvPLM\",\"date\":\"\"},{\"title\":\"Bats and old mining equipment in the mine\",\"duration\":\"17:44\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=zuF2vZy7z5g\",\"date\":\"\"},{\"title\":\"Part Two of the Wonderhussy & Wondersister visit to the War Eagle mine.\",\"duration\":\"16:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=xIRTm7z3Cn0\",\"date\":\"\"},{\"title\":\"Wonderhussy and Wondersister (!!) visit the mine.\",\"duration\":\"27:12\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=kQ5DdnwCGMY\",\"date\":\"\"},{\"title\":\"Who needs batteries? Going old school with CARBIDE!\",\"duration\":\"15:49\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=-N2qEtcQCic\",\"date\":\"\"},{\"title\":\"In and down, just wandering around.\",\"duration\":\"21:29\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Zojv9M0fDoE\",\"date\":\"\"},{\"title\":\"Hoping, hoping\\u2026bore hole gamble.\",\"duration\":\"9:47\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=NocA-nRq9vA\",\"date\":\"\"},{\"title\":\"Surprise trip to New Orleans!\",\"duration\":\"16:10\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=dRBvZTT-Mcc\",\"date\":\"\"},{\"title\":\"April 28, 1923. 100 years ago on this day, D. Mc C was here.\",\"duration\":\"59\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=eNg5XVMrj2k\",\"date\":\"\"},{\"title\":\"Let\\u2019s shoot today. Enfield #1mk3 (SMLE)\",\"duration\":\"9:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=oQwuP64lMJ8\",\"date\":\"\"},{\"title\":\"Safety reminder and explore into new section.\",\"duration\":\"13:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=aaiodnl-fyE\",\"date\":\"\"},{\"title\":\"Life with the Tecopa Mine Dogs\\u2014Cleopatra.\",\"duration\":\"6:49\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=10-KAG6vp1s\",\"date\":\"\"},{\"title\":\"3. What happened after Wonderhussy escaped YouTube jail?\",\"duration\":\"7:19\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=TNrhSrD7zi0\",\"date\":\"\"},{\"title\":\"2. Breaking Wonderhussy out of YouTube jail.\",\"duration\":\"2:14\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=eRyZcbdD4c8\",\"date\":\"\"},{\"title\":\"1. Where is Wonderhussy?\",\"duration\":\"10:23\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=FmkrS_vZzNs\",\"date\":\"\"},{\"title\":\"The museum begins\",\"duration\":\"5:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=95LAtT71Lyo\",\"date\":\"\"},{\"title\":\"Entitled trespassers drove right past me on my own land.\",\"duration\":\"1:51\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=6eSE3z8Iiek\",\"date\":\"\"},{\"title\":\"In a Talc mine!\",\"duration\":\"17:21\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lgVGyHqYB68\",\"date\":\"\"},{\"title\":\"A hike to a cross with Wonderhussy and a rescue\",\"duration\":\"7:46\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=p6_UH-a0PLo\",\"date\":\"\"},{\"title\":\"Walked by it without seeing it a hundred times\\u2026\",\"duration\":\"4:00\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=72g88mafAzs\",\"date\":\"\"},{\"title\":\"Making a dodgy old mine ladder safer again.\",\"duration\":\"13:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=79RG75-gt3w\",\"date\":\"\"},{\"title\":\"Noonday mine portal cleared\",\"duration\":\"4:32\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=T-xoIkhCguc\",\"date\":\"\"},{\"title\":\"New area of War Eagle accessible!\",\"duration\":\"26:27\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=CuOQ-qCMG-8\",\"date\":\"\"},{\"title\":\"Second descent into Columbia mine\",\"duration\":\"34:33\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=8XDQ5yLd2WI\",\"date\":\"\"},{\"title\":\"Checking Columbia Mine after yesterday\\u2019s rockfall\",\"duration\":\"33:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LAST3mMqH6Q\",\"date\":\"\"},{\"title\":\"Mine Collapse? I think so.\",\"duration\":\"4:55\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=HZT6VWZoJK8\",\"date\":\"\"},{\"title\":\"Flying over the mines in an RV-4\",\"duration\":\"4:40\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=rd9auSpWCdA\",\"date\":\"\"},{\"title\":\"Let there be light!!\",\"duration\":\"11:15\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=9xDDPS62pl4\",\"date\":\"\"},{\"title\":\"Unexpected visitor contact at Tecopa Mines\",\"duration\":\"4:16\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=k2wtw_lum0Q\",\"date\":\"\"},{\"title\":\"The joys of old mine ownership: repairing old ladders.\",\"duration\":\"10:04\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=HO7Q9WDCDSw\",\"date\":\"\"},{\"title\":\"Underground blooper. One-Legged Miner takes a little trip.\",\"duration\":\"8:36\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=CO-9e9zG43o\",\"date\":\"\"},{\"title\":\"Going underground for some work in a new section.\",\"duration\":\"7:51\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=5Mh9nx0dtXc\",\"date\":\"\"},{\"title\":\"Wonderhussy getting ready to hold off the zombies.\",\"duration\":\"2:12\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=KeXfo9GDwMA\",\"date\":\"\"},{\"title\":\"Merry Christmas and Thank You to each and every one of you.\",\"duration\":\"1:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=c0IguVR-SWE\",\"date\":\"\"},{\"title\":\"One-legged miner answers your questions\",\"duration\":\"29:01\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=bqwUT26ooOI\",\"date\":\"\"},{\"title\":\"Responding to Wonderhussy\\u2019s video\",\"duration\":\"8:04\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=BUoRv46GKcA\",\"date\":\"\"},{\"title\":\"One-legged mine owner speaks to crowd at Shoshone\\u2019s History Museum\",\"duration\":\"43:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ojB9u-yCrXk\",\"date\":\"\"},{\"title\":\"One-legged miner goes down into new area of Noonday mine.\",\"duration\":\"33:09\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=atScYBUfGdA\",\"date\":\"\"},{\"title\":\"Origin Story. Who I am and how it started. And how did I ever come to buy four mines?\",\"duration\":\"9:46\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=vqIjfqDJsCc\",\"date\":\"\"},{\"title\":\"Columbia burned drift 165 level\",\"duration\":\"3:48\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=hmEYDPqkYbI\",\"date\":\"\"},{\"title\":\"Checked out a van, made a new friend\",\"duration\":\"2:50\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=N8B-OqSaNi8\",\"date\":\"\"},{\"title\":\"The only rolling cart left\",\"duration\":\"1:19\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=SeqkT8Ny-qY\",\"date\":\"\"},{\"title\":\"We did it! First ore cart acquired!\",\"duration\":\"3:07\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=XCHc-RbD5Po\",\"date\":\"\"},{\"title\":\"Stepping into Old Country Part 2\",\"duration\":\"15:01\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=m_SAaFIs2js\",\"date\":\"\"},{\"title\":\"Stepping into old country pt 1\",\"duration\":\"7:32\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=e3MnQU-wrbg\",\"date\":\"\"},{\"title\":\"Rambling as I ramble half a mile underground.\",\"duration\":\"25:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LsakHmXqz5Y\",\"date\":\"\"},{\"title\":\"Vintage Dynamite in the War Eagle!\",\"duration\":\"14:32\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=dIhsDsxg4d8\",\"date\":\"\"},{\"title\":\"Trespassers at the mines\",\"duration\":\"3:20\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=JPdTgpDdJUs\",\"date\":\"\"},{\"title\":\"Riding the Underground Railroad\",\"duration\":\"1:18\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=6K9UbSECiH0\",\"date\":\"\"},{\"title\":\"Fatigued in the Columbia mine\",\"duration\":\"12:06\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=pYJJubu8pV0\",\"date\":\"\"},{\"title\":\"004 Found a tracked section of the Noonday.\",\"duration\":\"6:56\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=GG8zHmfWvJU\",\"date\":\"\"},{\"title\":\"003 Unexplored area of the Noonday mine (Part 1)\",\"duration\":\"7:32\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=h4RNPvZc6v8\",\"date\":\"\"},{\"title\":\"002 War Eagle drift\",\"duration\":\"25:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=4OJVPcJE-2g\",\"date\":\"\"},{\"title\":\"001 Intro. 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