Underfoot Rummage

12:50:39 SYSTEM PROCESSOR INITIATED... > Found 54 records in database. > isYT isPDF isIA isGoogle isDrive isJustJson 1 > prefix .Publications/Mining_publications > https://archive.org/details/ogofa isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Gwynedd_Cave___Pothole_Club_-_Ogofa > https://archive.org/details/pub_annales-des-mines-de-belgique isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Annals_of_Belgian_Mining > https://archive.org/details/pub_australian-mining isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Australian_Mining > https://archive.org/details/pub_coal-age isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Coal_Age > https://archive.org/details/pub_coal-mining-1949 isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Coal_Mining_magazine > https://archive.org/details/pub_engineering-and-mining-journal isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Engineering_and_Mining_Journal > https://archive.org/details/pub_journal-of-mining-science isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Journal_of_Mining_Science > https://archive.org/details/pub_mining-journal isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Mining_Journal > https://archive.org/details/pub_mining-world isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Mining_World > https://archive.org/details/pub_pit-quarry isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Pit_and_Quarry_magazine > https://archive.org/details/pub_transactions-society-for-mining-metallurgy-exploration isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Transactions_of_Society_for_Mining__Metallurgy__and_Exploration > https://archive.org/details/pub_world-mining isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/World_Mining > https://archive.org/details/subterranea isYT isPDF isIA 1 isGoogle isDrive isJustJson > prefix .Publications/Subterranea_Britannica > https://b-i-a-s.org.uk/bias-journal-index-2/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Bristol_Industrial_Archeology_Society > https://chelseaspelaeo.org/club/newsletter/archive isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Chelsea_Spelaeological_Society_Newsletter > https://chelseaspelaeo.org/club/publications isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Chelsea_Spelaeological_Society_Publications > https://cscc.org.uk/wiki/documents/newsletters isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Council_of_Southern_Caving_Clubs > https://files.expounder.info/Documents/Underground/Kent%20Underground%20Research%20Group isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Kent_Underground_Research_Group > https://files.expounder.info/Documents/Underground/Kent%20Underground%20Research%20Group/127.pdf isYT isPDF 1 isIA isGoogle isDrive isJustJson > prefix .Publications_Kent_Underground_Research_Group_Newsletter/127 > https://files.expounder.info/Documents/Underground/Kent%20Underground%20Research%20Group/135.pdf isYT isPDF 1 isIA isGoogle isDrive isJustJson > prefix .Publications_Kent_Underground_Research_Group_Newsletter/135 > https://kendalcaving.org.uk/publications-by-kendal-caving-club/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Kendal_Caving_Club > https://mendipcavinggroup.org.uk/about-us-contact-us/mcg-publications isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Mendip_Caving_Group > https://nymcc.org.uk/publications/moldywarps-speleological-group/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications_North_York_Moors_Caving_Club/Moldywarps_Speleological_Group > https://nymcc.org.uk/publications/scc-archives isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications_North_York_Moors_Caving_Club/Scarborough_Caving_Club > https://nymcc.org.uk/publications/yurt-archives/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications_North_York_Moors_Caving_Club/YURT_Archives > https://pdmhs.co.uk/files/articles.php isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Peak_District_Mines_Historical_Society_Articles > https://pdmhs.co.uk/newsletter-archives-series-1-1959-to-1975/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Peak_District_Mines_Historical_Society_Newsletters_1959-1975 > https://pdmhs.co.uk/uk-mines-in-1896/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Peak_District_Mines_Historical_Society_UK_Mines_in_1896 > https://thedca.org.uk/publications isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Derbyshire_Caving_Association > https://ubss.org.uk/publications/newsletters/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/University_of_Bristol_Spelaeological_Society > https://ubss.org.uk/publications/proceedings/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/University_of_Bristol_Spelaeological_Society_Proceedings > https://www.cambriancavingcouncil.org.uk/docs.html isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Cambrian_Caving_Council > https://www.catmhs.org.uk/past-newsletters/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Cumbria_Amenity_Trust_Mining_History_Society > https://www.mhti.ie/mhti-journals.html isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Mining_Heritage_Trust_of_Ireland_Journal > https://www.mhti.ie/mhti-newsletters.html isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Mining_Heritage_Trust_of_Ireland_Newsletter > https://www.shropshirecmc.org.uk/below.html isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Shropshire_Caving_and_Mining_Club > https://www.train4underground.co.uk/caban-magazines-available-online/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Caban > https://www.welshmines.org/previousnewsletters isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Welsh_Mines_Society > https://www.youtube.com/@adventuretraveller007 isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Adventure_Traveller > https://www.youtube.com/@BenoCam isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Ben_o_Cam > https://www.youtube.com/@Cavingcameraman isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Sid_Perou > https://www.youtube.com/@cornwallundergroundadventu6328 isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Cornwall_Underground > https://www.youtube.com/@davidwebb5674 isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/David_Webb > https://www.youtube.com/@Friends-of-Williamsons-Tunnels isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Friends_of_Williamson_s_Tunnels > https://www.youtube.com/@HiddenEarthVideoArchive isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Hidden_Earth > https://www.youtube.com/@Into-the-Silence/videos isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Days_of_Darkness_-_Cornwall > https://www.youtube.com/@LostMines isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Lost_Mines > https://www.youtube.com/@rossendalecollieries7995 isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Rossendale_Collieries__Northern_Industrial_History > https://www.youtube.com/@shonkytours2039 isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Shonky_Tours > https://www.youtube.com/@tecopamines isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Tecopa_Mines > https://www.youtube.com/@UndergroundExplorerUK isYT 1 isPDF isIA isGoogle isDrive isJustJson > prefix .Video/Underground_Explorer_UK > https://www.yssuk.com/yss/newsletters.html isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/Yorkshire_Subterranean_Society > https://yorkcavingclub.org.uk/publications/ isYT isPDF isIA isGoogle isDrive isJustJson > prefix .Publications/York_Caving_Club 12:50:39 PROCESS COMPLETE.

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5\",\"date\":\"1916-07-29\"},{\"title\":\"Coal Age 1916-09-30: Vol 10 Iss 14\",\"date\":\"1916-09-30\"},{\"title\":\"Coal Age 1916-10-21: Vol 10 Iss 17\",\"date\":\"1916-10-21\"},{\"title\":\"Coal Age 1914-11-07: Vol 6 Iss 19\",\"date\":\"1914-11-07\"},{\"title\":\"Coal Age 1915-03-27: Vol 7 Iss 13\",\"date\":\"1915-03-27\"},{\"title\":\"Coal Age 1915-12-04: Vol 8 Iss 23\",\"date\":\"1915-12-04\"},{\"title\":\"Coal Age 1917: Vol 12 Index\",\"date\":\"1917-01-01\"},{\"title\":\"Coal Age 1918-08-22: Vol 14 Iss 8\",\"date\":\"1918-08-22\"},{\"title\":\"Coal Age 1918-10-31: Vol 14 Iss 18\",\"date\":\"1918-10-31\"},{\"title\":\"Coal Age 1919-06-19: Vol 15 Iss 25\",\"date\":\"1919-06-19\"},{\"title\":\"Coal Age 1919-07-17: Vol 16 Iss 3\",\"date\":\"1919-07-17\"},{\"title\":\"Coal Age 1922-01-05: Vol 21 Iss 1\",\"date\":\"1922-01-05\"},{\"title\":\"Coal Age 1922-12-21: Vol 22 Iss 25\",\"date\":\"1922-12-21\"},{\"title\":\"Coal Age 1923-05-10: Vol 23 Iss 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 1952-06: Vol 57 Iss 6\",\"date\":\"1952-06-01\"},{\"title\":\"Coal Age 1986: Vol 91 Index\",\"date\":\"1986-01-01\"},{\"title\":\"Coal Age January 01-June 30, 1922: Vol 21 Index\",\"date\":\"1922-01-01\"},{\"title\":\"Coal Age January-December 1964: Vol 69 Index\",\"date\":\"1964-01-01\"},{\"title\":\"Coal Age July 01-December 31, 1924: Vol 26 Index\",\"date\":\"1924-07-01\"},{\"title\":\"Coal Age Mid-July 1956: Vol 61\",\"date\":\"1956-07-15\"},{\"title\":\"Coal Age 1912-11-16: Vol 2 Iss 20\",\"date\":\"1912-11-16\"},{\"title\":\"Coal Age 1913-08-02: Vol 4 Iss 5\",\"date\":\"1913-08-02\"},{\"title\":\"Coal Age 1911-12-30: Vol 1 Iss 12\",\"date\":\"1911-12-30\"},{\"title\":\"Coal Age 1912-06-08: Vol 1 Iss 35\",\"date\":\"1912-06-08\"},{\"title\":\"Coal Age 1915-03-13: Vol 7 Iss 11\",\"date\":\"1915-03-13\"},{\"title\":\"Coal Age 1915-06-05: Vol 7 Iss 23\",\"date\":\"1915-06-05\"},{\"title\":\"Coal Age 1923-03-29: Vol 23 Iss 13\",\"date\":\"1923-03-29\"},{\"title\":\"Coal Age 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 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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 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Supplement\",\"date\":\"1895-05-18\"},{\"title\":\"The Mining Journal 1896-04-04: Vol 66 Iss 3163\",\"date\":\"1896-04-04\"},{\"title\":\"The Mining Magazine 1959-10: Vol 101 Iss 4\",\"date\":\"1959-10-01\"},{\"title\":\"The Mining Journal 1867-04-06: Vol 37 Iss 1650\",\"date\":\"1867-04-06\"},{\"title\":\"The Mining Journal 1867-10-26: Vol 37 Iss 1679\",\"date\":\"1867-10-26\"},{\"title\":\"The Mining Journal 1869-09-11: Vol 39 Iss 1777\",\"date\":\"1869-09-11\"},{\"title\":\"The Mining Journal 1870-12-31: Vol 40 Supplement\",\"date\":\"1870-12-31\"},{\"title\":\"The Mining Journal 1872-02-24: Vol 42 Supplement\",\"date\":\"1872-02-24\"},{\"title\":\"The Mining Journal 1877-05-05: Vol 47 Supplement\",\"date\":\"1877-05-05\"},{\"title\":\"The Mining Journal 1880-08-21: Vol 50 Iss 2348\",\"date\":\"1880-08-21\"},{\"title\":\"The Mining Journal 1884-02-02: Vol 54 Supplement\",\"date\":\"1884-02-02\"},{\"title\":\"The Mining Journal 1884-07-19: Vol 54 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1856-02-09: Vol 26 Iss 1068\",\"date\":\"1856-02-09\"},{\"title\":\"Mining Journal 1848-02-05: Vol 18 Iss 650\",\"date\":\"1848-02-05\"},{\"title\":\"The Mining Journal 1867-12-28: Vol 37 Supplement\",\"date\":\"1867-12-28\"},{\"title\":\"The Mining Journal 1868-04-04: Vol 38 Supplement\",\"date\":\"1868-04-04\"},{\"title\":\"The Mining Journal 1870-04-23: Vol 40 Supplement\",\"date\":\"1870-04-23\"},{\"title\":\"The Mining Journal 1869-09-18: Vol 39 Supplement\",\"date\":\"1869-09-18\"},{\"title\":\"The Mining Journal 1870-01-01: Vol 40 Iss 1793\",\"date\":\"1870-01-01\"},{\"title\":\"The Mining Journal 1868-09-19: Vol 38 Iss 1726\",\"date\":\"1868-09-19\"},{\"title\":\"The Mining Journal 1870-09-24: Vol 40 Iss 1831\",\"date\":\"1870-09-24\"},{\"title\":\"The Mining Journal 1870-10-08: Vol 40 Iss 1833\",\"date\":\"1870-10-08\"},{\"title\":\"The Mining Journal 1871-03-18: Vol 41 Supplement\",\"date\":\"1871-03-18\"},{\"title\":\"The Mining Journal 1872-03-30: Vol 42 Supplement\",\"date\":\"1872-03-30\"},{\"title\":\"The Mining Journal 1871-05-13: Vol 41 Iss 1864\",\"date\":\"1871-05-13\"},{\"title\":\"The Mining Journal 1871-08-19: Vol 41 Iss 1878\",\"date\":\"1871-08-19\"},{\"title\":\"The Mining Journal 1871-09-09: Vol 41 Iss 1881\",\"date\":\"1871-09-09\"},{\"title\":\"The Mining Journal 1873-01-04: Vol 43 Iss 1950\",\"date\":\"1873-01-04\"},{\"title\":\"The Mining Journal 1873-12-06: Vol 43 Iss 1998\",\"date\":\"1873-12-06\"},{\"title\":\"The Mining Journal 1874-09-19: Vol 44 Supplement\",\"date\":\"1874-09-19\"},{\"title\":\"The Mining Journal 1875-09-25: Vol 45 Iss 2092\",\"date\":\"1875-09-25\"},{\"title\":\"The Mining Journal 1875-10-16: Vol 45 Iss 2095\",\"date\":\"1875-10-16\"},{\"title\":\"The Mining Journal 1874-02-14: Vol 44 Iss 2008\",\"date\":\"1874-02-14\"},{\"title\":\"The Mining Journal 1877-04-14: Vol 47 Iss 2173\",\"date\":\"1877-04-14\"},{\"title\":\"The Mining Journal 1877-06-30: Vol 47 Iss 2184\",\"date\":\"1877-06-30\"},{\"title\":\"The Mining Journal 1878-07-27: Vol 48 Supplement\",\"date\":\"1878-07-27\"},{\"title\":\"The Mining Journal 1877-12-15: Vol 47 Supplement\",\"date\":\"1877-12-15\"},{\"title\":\"The Mining Journal 1878-05-04: Vol 48 Supplement\",\"date\":\"1878-05-04\"},{\"title\":\"The Mining Journal 1878-06-29: Vol 48 Iss 2236\",\"date\":\"1878-06-29\"},{\"title\":\"The Mining Journal 1880-12-18: Vol 50 Supplement\",\"date\":\"1880-12-18\"},{\"title\":\"The Mining Journal 1881-03-19: Vol 51 Iss 2378\",\"date\":\"1881-03-19\"},{\"title\":\"The Mining Journal 1879-10-04: Vol 49 Supplement\",\"date\":\"1879-10-04\"},{\"title\":\"The Mining Journal 1880-04-17: Vol 50 Iss 2330\",\"date\":\"1880-04-17\"},{\"title\":\"The Mining Journal 1882-03-04: Vol 52 Iss 2428\",\"date\":\"1882-03-04\"},{\"title\":\"The Mining Journal 1882-03-04: Vol 52 Supplement\",\"date\":\"1882-03-04\"},{\"title\":\"The Mining Journal 1882-10-28: Vol 52 Iss 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 6378\",\"date\":\"1957-11-15\"},{\"title\":\"The Mining Journal 1960-04-29: Vol 254 Iss 6506\",\"date\":\"1960-04-29\"},{\"title\":\"Mining Journal 1836-07-16: Vol 3 Iss 47\",\"date\":\"1836-07-16\"},{\"title\":\"Mining Journal 1836-10-29: Vol 3 Iss 62\",\"date\":\"1836-10-29\"},{\"title\":\"Mining Journal 1836-11: Vol 3 Supplement\",\"date\":\"1836-11-01\"},{\"title\":\"Mining Journal 1837-06-17: Vol 4 Iss 95\",\"date\":\"1837-06-17\"},{\"title\":\"Mining Journal 1837-08-05: Vol 5 Iss 102\",\"date\":\"1837-08-05\"},{\"title\":\"Mining Journal 1837-09-09: Vol 5 Iss 107\",\"date\":\"1837-09-09\"},{\"title\":\"Mining Journal 1839-03-30: Vol 8 Iss 188\",\"date\":\"1839-03-30\"},{\"title\":\"Mining Journal 1839-12-21: Vol 9 Iss 226\",\"date\":\"1839-12-21\"},{\"title\":\"Mining Journal 1840-02-01: Vol 10 Iss 232\",\"date\":\"1840-02-01\"},{\"title\":\"Mining Journal 1841-08-07: Vol 11 Iss 311\",\"date\":\"1841-08-07\"},{\"title\":\"Mining Journal 1841-10-02: Vol 11 Iss 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 Journal 1839-05-18: Vol 8 Iss 195\",\"date\":\"1839-05-18\"},{\"title\":\"Mining Journal 1840-06-13: Vol 10 Iss 251\",\"date\":\"1840-06-13\"},{\"title\":\"Mining Journal 1843-08-05: Vol 13 Iss 415\",\"date\":\"1843-08-05\"},{\"title\":\"Mining Journal 1851-05-17: Vol 21 Iss 821\",\"date\":\"1851-05-17\"},{\"title\":\"Mining Journal 1851-05-24: Vol 21 Iss 822\",\"date\":\"1851-05-24\"},{\"title\":\"Mining Journal 1852-06-26: Vol 22 Iss 879\",\"date\":\"1852-06-26\"},{\"title\":\"Mining Journal 1852-07-31: Vol 22 Iss 884\",\"date\":\"1852-07-31\"},{\"title\":\"The Mining Journal 1857-01-24: Vol 27 Iss 1118\",\"date\":\"1857-01-24\"},{\"title\":\"The Mining Journal 1857-02-21: Vol 27 Iss 1122\",\"date\":\"1857-02-21\"},{\"title\":\"The Mining Journal 1865-09-09: Vol 35 Iss 1568\",\"date\":\"1865-09-09\"},{\"title\":\"The Mining Journal 1866-04-07: Vol 36 Iss 1598\",\"date\":\"1866-04-07\"},{\"title\":\"The Mining Journal 1866-10-27: Vol 36 Iss 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 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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 Journal 1875: Vol 45 Index\",\"date\":\"1875-01-01\"},{\"title\":\"The Mining Journal 1876-07-22: Vol 46 Supplement\",\"date\":\"1876-07-22\"},{\"title\":\"The Mining Journal 1880: Vol 50 Index\",\"date\":\"1880-01-01\"},{\"title\":\"The Mining Journal 1881-03-05: Vol 51 Supplement\",\"date\":\"1881-03-05\"},{\"title\":\"The Mining Journal 1881-05-14: Vol 51 Supplement\",\"date\":\"1881-05-14\"},{\"title\":\"The Mining Journal 1881-07-09: Vol 51 Iss 2394\",\"date\":\"1881-07-09\"},{\"title\":\"The Mining Journal 1882-10-07: Vol 52 Iss 2459\",\"date\":\"1882-10-07\"},{\"title\":\"The Mining Journal 1882-10-14: Vol 52 Iss 2460\",\"date\":\"1882-10-14\"},{\"title\":\"The Mining Journal 1882-11-25: Vol 52 Supplement\",\"date\":\"1882-11-25\"},{\"title\":\"Mining Journal 1851-07-05: Vol 21 Iss 828\",\"date\":\"1851-07-05\"},{\"title\":\"Mining Journal 1851-10-25: Vol 21 Iss 844\",\"date\":\"1851-10-25\"},{\"title\":\"Mining Journal 1852-03-06: Vol 22 Iss 863\",\"date\":\"1852-03-06\"},{\"title\":\"The Mining Journal 1854-10-07: Vol 24 Iss 998\",\"date\":\"1854-10-07\"},{\"title\":\"The Mining Journal 1855-04-07: Vol 25 Iss 1024\",\"date\":\"1855-04-07\"},{\"title\":\"The Mining Journal 1861-10-05: Vol 31 Supplement\",\"date\":\"1861-10-05\"},{\"title\":\"The Mining Journal 1862-01-11: Vol 32 Iss 1377\",\"date\":\"1862-01-11\"},{\"title\":\"The Mining Journal 1857-07-18: Vol 27 Iss 1143\",\"date\":\"1857-07-18\"},{\"title\":\"The Mining Journal 1863-04-25: Vol 33 Iss 1444\",\"date\":\"1863-04-25\"},{\"title\":\"The Mining Journal 1863-07-04: Vol 33 Iss 1454\",\"date\":\"1863-07-04\"},{\"title\":\"The Mining Journal 1863-11-07: Vol 33 Iss 1472\",\"date\":\"1863-11-07\"},{\"title\":\"The Mining Journal 1864-01-16: Vol 34 Iss 1482\",\"date\":\"1864-01-16\"},{\"title\":\"The Mining Journal 1858-12-25: Vol 28 Iss 1218\",\"date\":\"1858-12-25\"},{\"title\":\"The Mining Journal 1866-03-31: Vol 36 Iss 1597\",\"date\":\"1866-03-31\"},{\"title\":\"The Mining Journal 1865-04-15: Vol 35 Iss 1547\",\"date\":\"1865-04-15\"},{\"title\":\"The Mining Journal 1868-10-17: Vol 38 Iss 1730\",\"date\":\"1868-10-17\"},{\"title\":\"The Mining Journal 1868-12-12: Vol 38 Iss 1738\",\"date\":\"1868-12-12\"},{\"title\":\"The Mining Journal 1869-01-23: Vol 39 Iss 1744\",\"date\":\"1869-01-23\"},{\"title\":\"The Mining Journal 1869-06-12: Vol 39 Iss 1764\",\"date\":\"1869-06-12\"},{\"title\":\"The Mining Journal 1871-07-29: Vol 41 Iss 1875\",\"date\":\"1871-07-29\"},{\"title\":\"The Mining Journal 1873-12-20: Vol 43 Iss 2000\",\"date\":\"1873-12-20\"},{\"title\":\"The Mining Journal 1874-01-17: Vol 44 Supplement\",\"date\":\"1874-01-17\"},{\"title\":\"The Mining Journal 1874-02-21: Vol 44 Supplement\",\"date\":\"1874-02-21\"},{\"title\":\"The Mining Journal 1874-03-21: Vol 44 Iss 2013\",\"date\":\"1874-03-21\"},{\"title\":\"The Mining Journal 1874-03-28: Vol 44 Iss 2014\",\"date\":\"1874-03-28\"},{\"title\":\"The Mining Journal 1877-07-21: Vol 47 Iss 2187\",\"date\":\"1877-07-21\"},{\"title\":\"The Mining Journal 1877-11-24: Vol 47 Iss 2205\",\"date\":\"1877-11-24\"},{\"title\":\"The Mining Journal 1878-06-29: Vol 48 Supplement\",\"date\":\"1878-06-29\"},{\"title\":\"The Mining Journal 1878-08-17: Vol 48 Supplement\",\"date\":\"1878-08-17\"},{\"title\":\"The Mining Journal 1878-12-28: Vol 48 Supplement\",\"date\":\"1878-12-28\"},{\"title\":\"The Mining Journal 1879-01-18: Vol 49 Supplement\",\"date\":\"1879-01-18\"},{\"title\":\"The Mining Journal 1878-01-05: Vol 48 Supplement\",\"date\":\"1878-01-05\"},{\"title\":\"The Mining Journal 1878-03-09: Vol 48 Supplement\",\"date\":\"1878-03-09\"},{\"title\":\"The Mining Journal 1879-10-11: Vol 49 Supplement\",\"date\":\"1879-10-11\"},{\"title\":\"The Mining Journal 1880-07-31: Vol 50 Supplement\",\"date\":\"1880-07-31\"},{\"title\":\"The Mining Journal 1880-09-04: Vol 50 Iss 2350\",\"date\":\"1880-09-04\"},{\"title\":\"The Mining Journal 1884-10-11: Vol 54 Iss 2564\",\"date\":\"1884-10-11\"},{\"title\":\"The Mining Journal 1884-12-06: Vol 54 Iss 2572\",\"date\":\"1884-12-06\"},{\"title\":\"The Mining Journal 1954-02-19: Vol 242 Iss 6183\",\"date\":\"1954-02-19\"},{\"title\":\"The Mining Journal 1954-06-11: Vol 242 Iss 6199\",\"date\":\"1954-06-11\"},{\"title\":\"The Mining Magazine 1959-02: Vol 100 Iss 2\",\"date\":\"1959-02-01\"},{\"title\":\"The Mining Journal 1961-01-20: Vol 256 Iss 6544\",\"date\":\"1961-01-20\"},{\"title\":\"The Mining Journal 1959-06-19: Vol 252 Iss 6461\",\"date\":\"1959-06-19\"},{\"title\":\"The Mining Journal 1959-07-24: Vol 253 Iss 6466\",\"date\":\"1959-07-24\"},{\"title\":\"The Mining Journal 1959-07-24: Vol 253 Iss 6466\",\"date\":\"1959-07-24\"},{\"title\":\"The Mining Journal Magazine 1959-07: Vol 101 Iss 1\",\"date\":\"1959-07-01\"},{\"title\":\"The Mining Journal 1959-09-11: Vol 253 Iss 6473\",\"date\":\"1959-09-11\"},{\"title\":\"The Mining Journal 1959-10-23: Vol 253 Iss 6479\",\"date\":\"1959-10-23\"},{\"title\":\"The Mining Journal 1959-10-30: Vol 253 Iss 6480\",\"date\":\"1959-10-30\"},{\"title\":\"The Mining Journal 1956-01-13: Vol 246 Iss 6282\",\"date\":\"1956-01-13\"},{\"title\":\"The Mining Journal 1956-03-23: Vol 246 Iss 6292\",\"date\":\"1956-03-23\"},{\"title\":\"Mining Journal & Mining Magazine 1967: Vol 268-117 Index\",\"date\":\"1967-01-01\"},{\"title\":\"The Mining Journal Magazine January-June 1963: Vol 108 Index\",\"date\":\"1963-01-01\"},{\"title\":\"Mining Magazine January-June 1979: Vol 292-140 Index\",\"date\":\"1979-01-01\"},{\"title\":\"Mining Journal 1852-02-28: Vol 22 Iss 862\",\"date\":\"1852-02-28\"},{\"title\":\"Mining Journal 1852-07-17: Vol 22 Iss 882\",\"date\":\"1852-07-17\"},{\"title\":\"The Mining Journal 1854-07-08: Vol 24 Supplement\",\"date\":\"1854-07-08\"},{\"title\":\"The Mining Journal 1857-02-07: Vol 27 Supplement\",\"date\":\"1857-02-07\"},{\"title\":\"The Mining Journal 1858-03-13: Vol 28 Iss 1177\",\"date\":\"1858-03-13\"},{\"title\":\"The Mining Journal 1864-11-05: Vol 34 Iss 1524\",\"date\":\"1864-11-05\"},{\"title\":\"The Mining Journal 1867-03-16: Vol 37 Iss 1647\",\"date\":\"1867-03-16\"},{\"title\":\"The Mining Journal 1869-10-09: Vol 39 Supplement\",\"date\":\"1869-10-09\"},{\"title\":\"The Mining Journal 1874-12-12: Vol 44 Iss 2051\",\"date\":\"1874-12-12\"},{\"title\":\"The Mining Journal 1877-10-06: Vol 47 Iss 2198\",\"date\":\"1877-10-06\"},{\"title\":\"The Mining Journal 1881-04-23: Vol 51 Supplement\",\"date\":\"1881-04-23\"},{\"title\":\"Mining Journal 1840-11-28: Vol 10 Iss 275\",\"date\":\"1840-11-28\"},{\"title\":\"Mining Journal 1843: Vol 13 Index\",\"date\":\"1843-01-01\"},{\"title\":\"Mining Journal 1844-10-05: Vol 14 Iss 476\",\"date\":\"1844-10-05\"},{\"title\":\"The Mining Journal 1853-04-09: Vol 23 Iss 920\",\"date\":\"1853-04-09\"},{\"title\":\"The Mining Journal 1859-01-15: Vol 29 Iss 1221\",\"date\":\"1859-01-15\"},{\"title\":\"The Mining Journal 1862-11-29: Vol 32 Supplement\",\"date\":\"1862-11-29\"},{\"title\":\"The Mining Journal 1864-04-02: Vol 34 Iss 1493\",\"date\":\"1864-04-02\"},{\"title\":\"The Mining Journal 1864-05-21: Vol 34 Supplement\",\"date\":\"1864-05-21\"},{\"title\":\"The Mining Journal 1879: Vol 49 Index\",\"date\":\"1879-01-01\"},{\"title\":\"The Mining Journal 1884-05-03: Vol 54 Iss 2541\",\"date\":\"1884-05-03\"},{\"title\":\"Mining Journal 1838-01-20: Vol 6 Iss 126\",\"date\":\"1838-01-20\"},{\"title\":\"Mining Journal 1841-04-24: Vol 11 Iss 296\",\"date\":\"1841-04-24\"},{\"title\":\"The Mining Journal 1856-05-03: Vol 26 Iss 1080\",\"date\":\"1856-05-03\"},{\"title\":\"The Mining Journal 1856-07-12: Vol 26 Iss 1090\",\"date\":\"1856-07-12\"},{\"title\":\"The Mining Journal 1864-03-12: Vol 34 Iss 1490\",\"date\":\"1864-03-12\"},{\"title\":\"The Mining Journal 1867-09-07: Vol 37 Iss 1672\",\"date\":\"1867-09-07\"},{\"title\":\"The Mining Journal 1871-01-28: Vol 41 Iss 1849\",\"date\":\"1871-01-28\"},{\"title\":\"The Mining Journal 1875-03-06: Vol 45 Supplement\",\"date\":\"1875-03-06\"},{\"title\":\"The Mining Journal 1883-07-07: Vol 53 Iss 2498\",\"date\":\"1883-07-07\"},{\"title\":\"The Mining Journal Magazine 1961-08: Vol 105 Iss 2\",\"date\":\"1961-08-01\"},{\"title\":\"Mining Journal 1844-10-19: Vol 14 Iss 478\",\"date\":\"1844-10-19\"},{\"title\":\"Mining Journal 1852-02-07: Vol 22 Iss 859\",\"date\":\"1852-02-07\"},{\"title\":\"The Mining Journal 1857-03-14: Vol 27 Iss 1125\",\"date\":\"1857-03-14\"},{\"title\":\"The Mining Journal 1857-12-05: Vol 27 Iss 1163\",\"date\":\"1857-12-05\"},{\"title\":\"The Mining Journal 1859-05-07: Vol 29 Supplement\",\"date\":\"1859-05-07\"},{\"title\":\"The Mining Journal 1872-02-10: Vol 42 Supplement\",\"date\":\"1872-02-10\"},{\"title\":\"The Mining Journal 1872-08-10: Vol 42 Iss 1929\",\"date\":\"1872-08-10\"},{\"title\":\"The Mining Journal 1872-12-21: Vol 42 Supplement\",\"date\":\"1872-12-21\"},{\"title\":\"The Mining Journal 1874-03-21: Vol 44 Supplement\",\"date\":\"1874-03-21\"},{\"title\":\"The Mining Journal 1876-02-19: Vol 46 Supplement\",\"date\":\"1876-02-19\"},{\"title\":\"The Mining Journal 1883-12-15: Vol 53 Supplement\",\"date\":\"1883-12-15\"},{\"title\":\"The Mining Journal 1884-09-06: Vol 54 Supplement\",\"date\":\"1884-09-06\"},{\"title\":\"The Mining Journal 1857-05-09: Vol 27 Iss 1133\",\"date\":\"1857-05-09\"},{\"title\":\"The Mining Journal 1880-07-24: Vol 50 Iss 2344\",\"date\":\"1880-07-24\"},{\"title\":\"Mining Journal 1838-12-08: Vol 7 Iss 172\",\"date\":\"1838-12-08\"},{\"title\":\"Mining Journal 1839-11-30: Vol 9 Iss 223\",\"date\":\"1839-11-30\"},{\"title\":\"Mining Journal 1849-10-20: Vol 19 Iss 739\",\"date\":\"1849-10-20\"},{\"title\":\"Mining Journal 1850-10-19: Vol 20 Iss 791\",\"date\":\"1850-10-19\"},{\"title\":\"The Mining Journal 1853-11-12: Vol 23 Iss 951\",\"date\":\"1853-11-12\"},{\"title\":\"The Mining Journal 1862-03-15: Vol 32 Iss 1386\",\"date\":\"1862-03-15\"},{\"title\":\"The Mining Journal 1874-04-04: Vol 44 Supplement\",\"date\":\"1874-04-04\"},{\"title\":\"The Mining Journal 1874-05-09: Vol 44 Supplement\",\"date\":\"1874-05-09\"},{\"title\":\"The Mining Journal 1878-10-26: Vol 48 Iss 2253\",\"date\":\"1878-10-26\"},{\"title\":\"The Mining Journal 1878-11-30: Vol 48 Iss 2258\",\"date\":\"1878-11-30\"},{\"title\":\"The Mining Journal 1878-12-07: Vol 48 Supplement\",\"date\":\"1878-12-07\"},{\"title\":\"The Mining Journal 1881-08-20: Vol 51 Supplement\",\"date\":\"1881-08-20\"},{\"title\":\"The Mining Journal 1881-09-03: Vol 51 Supplement\",\"date\":\"1881-09-03\"},{\"title\":\"The Mining Journal 1881-10-08: Vol 51 Iss 2407\",\"date\":\"1881-10-08\"},{\"title\":\"The Mining Journal 1881-12-24: Vol 51 Supplement\",\"date\":\"1881-12-24\"},{\"title\":\"The Mining Journal 1951-05-25: Vol 236 Iss 6040\",\"date\":\"1951-05-25\"},{\"title\":\"The Mining Journal 1951-07-20: Vol 237 Iss 6048\",\"date\":\"1951-07-20\"},{\"title\":\"The Mining Journal 1952-03-14: Vol 238 Iss 6082\",\"date\":\"1952-03-14\"},{\"title\":\"The Mining Journal 1952-05-02: Vol 238 Iss 6089\",\"date\":\"1952-05-02\"},{\"title\":\"The Mining Journal 1959-04-03: Vol 252 Iss 6450\",\"date\":\"1959-04-03\"},{\"title\":\"The Mining Journal 1959-05-01: Vol 252 Supplement\",\"date\":\"1959-05-01\"},{\"title\":\"The Mining Journal 1961-03-17: Vol 256 Iss 6552\",\"date\":\"1961-03-17\"},{\"title\":\"Mining Journal 1836-09-03: Vol 3 Iss 54\",\"date\":\"1836-09-03\"},{\"title\":\"Mining Journal 1841-05-08: Vol 11 Iss 298\",\"date\":\"1841-05-08\"},{\"title\":\"Mining Journal 1842-01-08: Vol 12 Iss 333\",\"date\":\"1842-01-08\"},{\"title\":\"Mining Journal 1843-02-18: Vol 13 Iss 391\",\"date\":\"1843-02-18\"},{\"title\":\"Mining Journal 1843: Vol 12 Supplement\",\"date\":\"1843-01-01\"},{\"title\":\"Mining Journal 1844-08-10: Vol 14 Iss 468\",\"date\":\"1844-08-10\"},{\"title\":\"Mining Journal 1845-03-08: Vol 15 Iss 498\",\"date\":\"1845-03-08\"},{\"title\":\"Mining Journal 1845-04-05: Vol 15 Iss 502\",\"date\":\"1845-04-05\"},{\"title\":\"Mining Journal 1852-07-03: Vol 22 Iss 880\",\"date\":\"1852-07-03\"},{\"title\":\"The Mining Journal 1853-02-12: Vol 23 Iss 912\",\"date\":\"1853-02-12\"},{\"title\":\"The Mining Journal 1853-04-02: Vol 23 Iss 919\",\"date\":\"1853-04-02\"},{\"title\":\"The Mining Journal 1856-02-23: Vol 26 Iss 1070\",\"date\":\"1856-02-23\"},{\"title\":\"The Mining Journal 1856-11-08: Vol 26 Iss 1107\",\"date\":\"1856-11-08\"},{\"title\":\"The Mining Journal 1863-08-15: Vol 33 Iss 1460\",\"date\":\"1863-08-15\"},{\"title\":\"The Mining Journal 1865-08-12: Vol 35 Iss 1564\",\"date\":\"1865-08-12\"},{\"title\":\"The Mining Journal 1865-09-02: Vol 35 Iss 1567\",\"date\":\"1865-09-02\"},{\"title\":\"The Mining Journal 1866-09-29: Vol 36 Iss 1623\",\"date\":\"1866-09-29\"},{\"title\":\"The Mining Journal 1866-12-01: Vol 36 Iss 1632\",\"date\":\"1866-12-01\"},{\"title\":\"The Mining Journal 1871-06-10: Vol 41 Supplement\",\"date\":\"1871-06-10\"},{\"title\":\"The Mining Journal 1871-08-12: Vol 41 Iss 1877\",\"date\":\"1871-08-12\"},{\"title\":\"The Mining Journal 1871-09-02: Vol 41 Iss 1880\",\"date\":\"1871-09-02\"},{\"title\":\"The Mining Journal 1869-01-02: Vol 39 Iss 1741\",\"date\":\"1869-01-02\"},{\"title\":\"The Mining Journal 1869-02-27: Vol 39 Supplement\",\"date\":\"1869-02-27\"},{\"title\":\"The Mining Journal 1869-09-11: Vol 39 Supplement\",\"date\":\"1869-09-11\"},{\"title\":\"The Mining Journal 1869-12-25: Vol 39 Iss 1792\",\"date\":\"1869-12-25\"},{\"title\":\"The Mining Journal 1870-03-05: Vol 40 Iss 1802\",\"date\":\"1870-03-05\"},{\"title\":\"The Mining Journal 1872-11-23: Vol 42 Iss 1944\",\"date\":\"1872-11-23\"},{\"title\":\"The Mining Journal 1877-03-31: Vol 47 Supplement\",\"date\":\"1877-03-31\"},{\"title\":\"The Mining Journal 1877-04-14: Vol 47 Supplement\",\"date\":\"1877-04-14\"},{\"title\":\"The Mining Journal 1877-12-01: Vol 47 Iss 2206\",\"date\":\"1877-12-01\"},{\"title\":\"The Mining Journal 1885-03-14: Vol 55 Supplement\",\"date\":\"1885-03-14\"},{\"title\":\"The Mining Journal 1884-05-17: Vol 54 Iss 2543\",\"date\":\"1884-05-17\"},{\"title\":\"The Mining Journal 1884-05-31: Vol 54 Supplement\",\"date\":\"1884-05-31\"},{\"title\":\"The Mining Journal 1884-07-05: Vol 54 Iss 2550\",\"date\":\"1884-07-05\"},{\"title\":\"The Mining Journal 1957-10-25: Vol 249 Iss 6375\",\"date\":\"1957-10-25\"},{\"title\":\"The Mining Journal 1957-12-06: Vol 249 Iss 6381\",\"date\":\"1957-12-06\"},{\"title\":\"The Mining Journal 1958-01-10: Vol 250 Iss 6386\",\"date\":\"1958-01-10\"},{\"title\":\"The Mining Journal 1958-05-30: Vol 250 Iss 6406\",\"date\":\"1958-05-30\"},{\"title\":\"The Mining Journal 1959-07-03: Vol 253 Iss 6463\",\"date\":\"1959-07-03\"},{\"title\":\"The Mining Journal 1960-02-12: Vol 254 Iss 6495\",\"date\":\"1960-02-12\"},{\"title\":\"The Mining Journal 1960-02-19: Vol 254 Iss 6496\",\"date\":\"1960-02-19\"},{\"title\":\"The Mining Journal 1960-04-29: Vol 254 Supplement\",\"date\":\"1960-04-29\"},{\"title\":\"Mining Journal 1837-03-18: Vol 4 Iss 82\",\"date\":\"1837-03-18\"},{\"title\":\"Mining Journal 1837-07-01: Vol 5 Iss 97\",\"date\":\"1837-07-01\"},{\"title\":\"Mining Journal 1837: Vol 3 Supplement\",\"date\":\"1837-01-01\"},{\"title\":\"Mining Journal 1846-10-24: Vol 16 Iss 583\",\"date\":\"1846-10-24\"},{\"title\":\"Mining Journal 1848-06-17: Vol 18 Iss 669\",\"date\":\"1848-06-17\"},{\"title\":\"The Mining Journal 1857-06-13: Vol 27 Iss 1138\",\"date\":\"1857-06-13\"},{\"title\":\"The Mining Journal 1858-09-04: Vol 28 Iss 1202\",\"date\":\"1858-09-04\"},{\"title\":\"The Mining Journal 1858-11-13: Vol 28 Supplement\",\"date\":\"1858-11-13\"},{\"title\":\"The Mining Journal 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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 4\",\"date\":\"1941-10-01\"},{\"title\":\"Pit & Quarry 1942-09: Vol 35 Iss 3\",\"date\":\"1942-09-01\"},{\"title\":\"Pit & Quarry 1961-01: Vol 53 Iss 7\",\"date\":\"1961-01-01\"},{\"title\":\"Pit & Quarry 1961-10: Vol 54 Iss 4\",\"date\":\"1961-10-01\"},{\"title\":\"Pit & Quarry 1932-06-29: Vol 24 Iss 7\",\"date\":\"1932-06-29\"},{\"title\":\"Pit & Quarry 1934-03: Vol 26 Iss 9\",\"date\":\"1934-03-01\"},{\"title\":\"Pit & Quarry 1935-02: Vol 27 Iss 8\",\"date\":\"1935-02-01\"},{\"title\":\"Pit & Quarry 1938-04: Vol 30 Iss 10\",\"date\":\"1938-04-01\"},{\"title\":\"Pit & Quarry 1946-01: Vol 38 Iss 7\",\"date\":\"1946-01-01\"},{\"title\":\"Pit & Quarry 1946-09: Vol 39 Iss 3\",\"date\":\"1946-09-01\"},{\"title\":\"Pit & Quarry 1945-04: Vol 37 Iss 10\",\"date\":\"1945-04-01\"},{\"title\":\"Pit and Quarry 1951-10: Vol 44 Iss 4\",\"date\":\"1951-10-01\"},{\"title\":\"Pit and Quarry 1953-01: Vol 45 Iss 7\",\"date\":\"1953-01-01\"},{\"title\":\"Pit and Quarry 1953-02: Vol 45 Iss 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: Vol 23 Iss 1\",\"date\":\"1931-10-07\"},{\"title\":\"Pit & Quarry 1944-02: Vol 36 Iss 8\",\"date\":\"1944-02-01\"},{\"title\":\"Pit and Quarry 1958-04: Vol 50 Iss 10\",\"date\":\"1958-04-01\"},{\"title\":\"Pit & Quarry 1961-08: Vol 54 Iss 2\",\"date\":\"1961-08-01\"},{\"title\":\"Pit & Quarry 1966: Vol 59 Index\",\"date\":\"1966-01-01\"},{\"title\":\"Pit and Quarry 1971 - 1972: Vol 64 Index\",\"date\":\"1971-01-01\"},{\"title\":\"Pit & Quarry 1926-01-15: Vol 11 Iss 8\",\"date\":\"1926-01-15\"},{\"title\":\"Pit & Quarry 1932-12: Vol 25 Iss 4\",\"date\":\"1932-12-01\"},{\"title\":\"Pit & Quarry 1937-01: Vol 29 Iss 7\",\"date\":\"1937-01-01\"},{\"title\":\"Pit and Quarry 1950-03: Vol 42 Iss 9\",\"date\":\"1950-03-01\"},{\"title\":\"Pit and Quarry 1951-04: Vol 43 Iss 10\",\"date\":\"1951-04-01\"},{\"title\":\"Pit & Quarry 1926-09-15: Vol 12 Iss 12\",\"date\":\"1926-09-15\"},{\"title\":\"Pit and Quarry 1946-04: Vol 38 Iss 10\",\"date\":\"1946-04-01\"},{\"title\":\"Pit and Quarry 1942-06: Vol 34 Iss 12\",\"date\":\"1942-06-01\"},{\"title\":\"Pit & Quarry 1942-11: Vol 35 Iss 5\",\"date\":\"1942-11-01\"},{\"title\":\"Pit & Quarry 1943-05: Vol 35 Iss 11\",\"date\":\"1943-05-01\"},{\"title\":\"Pit and Quarry 1957: Vol 49 Index\",\"date\":\"1957-01-01\"},{\"title\":\"Pit & Quarry 1949-07: Vol 42 Iss 1\",\"date\":\"1949-07-01\"},{\"title\":\"Pit & Quarry 1960-12: Vol 53 Iss 6\",\"date\":\"1960-12-01\"},{\"title\":\"Pit & Quarry 1917-05: Vol 1 Iss 4\",\"date\":\"1917-05-01\"},{\"title\":\"Pit & Quarry 1919-10: Vol 4 Iss 1\",\"date\":\"1919-10-01\"},{\"title\":\"Pit & Quarry 1921-10: Vol 6 Iss 1\",\"date\":\"1921-10-01\"},{\"title\":\"Pit & Quarry 1922-05: Vol 6 Iss 8\",\"date\":\"1922-05-01\"},{\"title\":\"Pit & Quarry 1923-04: Vol 7 Iss 7\",\"date\":\"1923-04-01\"},{\"title\":\"Pit & Quarry 1924-10-01: Vol 9 Iss 1\",\"date\":\"1924-10-01\"},{\"title\":\"Pit & Quarry 1924-11-01: Vol 9 Iss 3\",\"date\":\"1924-11-01\"},{\"title\":\"Pit & Quarry 1930-08-27: Vol 20 Iss 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 Iss 11\",\"date\":\"1945-05-01\"},{\"title\":\"Pit & Quarry 1917-08: Vol 1 Iss 6\",\"date\":\"1917-08-01\"},{\"title\":\"Pit & Quarry 1921-02: Vol 5 Iss 5\",\"date\":\"1921-02-01\"},{\"title\":\"Pit and Quarry 1937-03: Vol 29 Iss 9\",\"date\":\"1937-03-01\"},{\"title\":\"Pit & Quarry 1938-08: Vol 31 Iss 2\",\"date\":\"1938-08-01\"},{\"title\":\"Pit and Quarry 1946-10: Vol 39 Iss 4\",\"date\":\"1946-10-01\"},{\"title\":\"Pit and Quarry 1944-05: Vol 36 Iss 11\",\"date\":\"1944-05-01\"},{\"title\":\"Pit and Quarry 1949-07: Vol 42 Iss 1\",\"date\":\"1949-07-01\"},{\"title\":\"Pit and Quarry 1949-08: Vol 42 Iss 2\",\"date\":\"1949-08-01\"},{\"title\":\"Pit and Quarry 1950-05: Vol 42 Iss 11\",\"date\":\"1950-05-01\"},{\"title\":\"Pit & Quarry 1922-08: Vol 6 Iss 11\",\"date\":\"1922-08-01\"},{\"title\":\"Pit & Quarry 1925-01-01: Vol 9 Iss 7\",\"date\":\"1925-01-01\"},{\"title\":\"Pit & Quarry 1925-03-01: Vol 9 Iss 11\",\"date\":\"1925-03-01\"},{\"title\":\"Pit & Quarry 1926-02-15: Vol 11 Iss 10\",\"date\":\"1926-02-15\"},{\"title\":\"Pit & Quarry 1929-07-03: Vol 18 Iss 7\",\"date\":\"1929-07-03\"},{\"title\":\"Pit & Quarry 1929-12-18: Vol 19 Iss 6\",\"date\":\"1929-12-18\"},{\"title\":\"Pit & Quarry 1929 - 1930: Vol 18 Index\",\"date\":\"1929-01-01\"},{\"title\":\"Pit & Quarry 1935-03: Vol 27 Iss 9\",\"date\":\"1935-03-01\"},{\"title\":\"Pit & Quarry 1936-04: Vol 28 Iss 10\",\"date\":\"1936-04-01\"},{\"title\":\"Pit & Quarry 1936-08: Vol 29 Iss 2\",\"date\":\"1936-08-01\"},{\"title\":\"Pit & Quarry 1926-09-29: Vol 12 Iss 13\",\"date\":\"1926-09-29\"},{\"title\":\"Pit & Quarry 1927-07-20: Vol 14 Iss 8\",\"date\":\"1927-07-20\"},{\"title\":\"Pit & Quarry 1927 - 1928: Vol 15 Index\",\"date\":\"1927-01-01\"},{\"title\":\"Pit & Quarry 1928-03-28: Vol 15 Iss 13\",\"date\":\"1928-03-28\"},{\"title\":\"Pit and Quarry 1941-10: Vol 34 Iss 4\",\"date\":\"1941-10-01\"},{\"title\":\"Pit and Quarry 1954-12: Vol 47 Iss 6\",\"date\":\"1954-12-01\"},{\"title\":\"Pit and Quarry 1958-07: Vol 51 Iss 1\",\"date\":\"1958-07-01\"},{\"title\":\"Pit and Quarry 1959-06: Vol 51 Iss 12\",\"date\":\"1959-06-01\"},{\"title\":\"Pit and Quarry 1959-12: Vol 52 Iss 6\",\"date\":\"1959-12-01\"},{\"title\":\"Pit & Quarry 1960-08: Vol 53 Iss 2\",\"date\":\"1960-08-01\"},{\"title\":\"Pit & Quarry 1936-12: Vol 29 Iss 6\",\"date\":\"1936-12-01\"},{\"title\":\"Pit & Quarry 1937-03: Vol 29 Iss 9\",\"date\":\"1937-03-01\"},{\"title\":\"Pit and Quarry 1937-06: Vol 29 Iss 12\",\"date\":\"1937-06-01\"},{\"title\":\"Pit and Quarry 1938-08: Vol 31 Iss 2\",\"date\":\"1938-08-01\"},{\"title\":\"Pit and Quarry 1946-07: Vol 39 Iss 1\",\"date\":\"1946-07-01\"},{\"title\":\"Pit & Quarry 1947-04: Vol 39 Iss 10\",\"date\":\"1947-04-01\"},{\"title\":\"Pit & Quarry 1947-12: Vol 40 Iss 6\",\"date\":\"1947-12-01\"},{\"title\":\"Pit and Quarry 1941-07: Vol 34 Iss 1\",\"date\":\"1941-07-01\"},{\"title\":\"Pit & Quarry 1942-07: Vol 35 Iss 1\",\"date\":\"1942-07-01\"},{\"title\":\"Pit and Quarry 1950-10: Vol 43 Iss 4\",\"date\":\"1950-10-01\"},{\"title\":\"Pit and Quarry 1953-04: Vol 45 Iss 10\",\"date\":\"1953-04-01\"},{\"title\":\"Pit and Quarry 1954-02: Vol 46 Iss 8\",\"date\":\"1954-02-01\"},{\"title\":\"Pit & Quarry 1960 - 1961: Vol 53 Index\",\"date\":\"1960-01-01\"},{\"title\":\"Pit & Quarry 1918-08: Vol 2 Iss 9\",\"date\":\"1918-08-01\"},{\"title\":\"Pit & Quarry 1918-11: Vol 3 Iss 2\",\"date\":\"1918-11-01\"},{\"title\":\"Pit & Quarry 1931-09-09: Vol 22 Iss 12\",\"date\":\"1931-09-09\"},{\"title\":\"Pit & Quarry 1933-02: Vol 25 Iss 6\",\"date\":\"1933-02-01\"},{\"title\":\"Pit & Quarry 1936-02: Vol 28 Iss 8\",\"date\":\"1936-02-01\"},{\"title\":\"Pit and Quarry 1945-09: Vol 38 Iss 3\",\"date\":\"1945-09-01\"},{\"title\":\"Pit and Quarry 1954-11: Vol 47 Iss 5\",\"date\":\"1954-11-01\"},{\"title\":\"Pit and Quarry 1956-06: Vol 48 Iss 12\",\"date\":\"1956-06-01\"},{\"title\":\"Pit and Quarry 1956-11: Vol 49 Iss 5\",\"date\":\"1956-11-01\"},{\"title\":\"Pit and Quarry 1957-08: Vol 50 Iss 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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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chamber\",\"duration\":\"18:51\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=tAEbet6kYP4\",\"date\":\"\"},{\"title\":\"Unearthing the basement rooms below Joseph Williamson's house\",\"duration\":\"23:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=MJOoxMZPgFY\",\"date\":\"\"},{\"title\":\"The Caver's Squeeze and the Northern Monkeys\",\"duration\":\"24:01\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=nK0GxjFdv_M\",\"date\":\"\"},{\"title\":\"Linacre, Lunt, Boote and Hand of Paddington, Edge Hill\",\"duration\":\"17:06\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=NidoHzQXMw0\",\"date\":\"\"},{\"title\":\"THE CASK\",\"duration\":\"19:04\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=He-m0bG8BbQ\",\"date\":\"\"},{\"title\":\"Joseph Williamson's Triple Decker Tunnel\",\"duration\":\"21:26\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=3GkL3gsfjEE\",\"date\":\"\"},{\"title\":\"FoWT's exploratory digs on the Magnet 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Williamson's Tunnels\",\"duration\":\"53\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=uF-nCplXqNw\",\"date\":\"\"},{\"title\":\"No 9 A look inside the new excavation at the Paddington Cellars of Joseph Williamson\",\"duration\":\"2:35\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=YkLVojeSouM\",\"date\":\"\"},{\"title\":\"No. 8 A look inside the Magnet Chamber accessed from the Banqueting Hall below Williamson's house\",\"duration\":\"15:39\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=lZHhwZSTQa0\",\"date\":\"\"},{\"title\":\"No 7 A climb up into The Gothic Arch high up in the side wall of Williamson's Banqueting Hall\",\"duration\":\"7:28\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=pxbmUMj9XeA\",\"date\":\"\"},{\"title\":\"No 6 This time we take a walk around the Banqueting Hall below where Williamson's house once stood\",\"duration\":\"7:09\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=A40_a_oWX84\",\"date\":\"\"},{\"title\":\"No 5 A walk down the gash that leads us into the Banqueting Hall below Joseph Williamson's house\",\"duration\":\"3:26\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=ZngcggoGLWk\",\"date\":\"\"},{\"title\":\"No 4 A walk down to the sandstone chamber from the rear of Williamson's house.\",\"duration\":\"5:34\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=LLuD3CZGiao\",\"date\":\"\"},{\"title\":\"No.3 A walk around the basement kitchen and sunken back yard of Williamson's house in Mason Street\",\"duration\":\"5:22\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=iW7t6N-5hxA\",\"date\":\"\"},{\"title\":\"No.2 A walk around the Wine Bins area below Williamson's house\",\"duration\":\"7:01\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=DrDkYoodj7o\",\"date\":\"\"},{\"title\":\"No.1 A walkthrough in the Paddington section of the Williamson Tunnels\",\"duration\":\"15:05\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=vrlBUmvs6Cg\",\"date\":\"\"},{\"title\":\"Journey of a Bucket 2\",\"duration\":\"1:40\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=U0Arr6eJ2RM\",\"date\":\"\"},{\"title\":\"Unexplored Tunnel on Mason Street\",\"duration\":\"1:25\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Xfswq49wimw\",\"date\":\"\"},{\"title\":\"Paddington - 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Join us on an Amazing Slate Mine Explore!\",\"duration\":\"11:53\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=4br44AgwUJs\",\"date\":\"\"},{\"title\":\"Lost Mine Reveals Stunning Finds and Underwater Cavern Explored with ROV\",\"duration\":\"15:54\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=pS2gcKGd6z8\",\"date\":\"\"},{\"title\":\"We find & Investigate Mystery Equipment Underground in Lost Mine\",\"duration\":\"10:02\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=U1G3wGm6Ffs\",\"date\":\"\"},{\"title\":\"Amazing explore with artifacts found in Lost Mine!\",\"duration\":\"14:28\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=EYpi1iu4Yl4\",\"date\":\"\"},{\"title\":\"Beautiful Hike and amazing finds on Lost Mine Explore\",\"duration\":\"7:15\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Q3K3TXcd2Gk\",\"date\":\"\"},{\"title\":\"Lost mine, Now found! Amazing work exploring this Lost Copper mine!\",\"duration\":\"15:37\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=Nzou_OW8CvA\",\"date\":\"\"},{\"title\":\"Amazing explore and Dangerous crossing Unveils This Lost Mine Secrets\",\"duration\":\"16:26\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=L3SORZtaRmE\",\"date\":\"\"},{\"title\":\"Crawling Deep Underground Led to Amazing Finds in New Lost Mine\",\"duration\":\"13:08\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=fjc0w8VP6QI\",\"date\":\"\"},{\"title\":\"NEW Area Keeps Giving! Tight fit at the Bread Oven Lost Mine\",\"duration\":\"14:24\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=7pRHX4SRuGE\",\"date\":\"\"},{\"title\":\"Bread OVEN Lost Mine? Searching for Great Discoveries in NEW Area\",\"duration\":\"8:43\",\"url\":\"https:\\/\\/www.youtube.com\\/watch?v=GHynDKO44aw\",\"date\":\"\"},{\"title\":\"AMAZING Old mini copper mine FOUND! 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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