The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 137
COAL : 4. Coal Mining and Production COAL MINING PROCEDURES COAL : 4. Coal Mining and Production COAL : 4. RECOVERABLE COAL RESOURCES ( Mapped and explored ) Percent of world total In billion metric tons Soviet Union 2,950 68.5 % North ...
COAL : 4. Coal Mining and Production COAL MINING PROCEDURES COAL : 4. Coal Mining and Production COAL : 4. RECOVERABLE COAL RESOURCES ( Mapped and explored ) Percent of world total In billion metric tons Soviet Union 2,950 68.5 % North ...
Page 139
COAL : 4. Coal Mining and Production LONGWALL MINING TECHNIQUE COAL : 5. Coal Derivatives COAL : 6. Coal -. 139 LONGWALL ADVANCING MAIN SEAM WORKING FACE I LONGWALL RETREATING MAIN SEAM AIR AND MAIN SHAFTS MAIN PILLAR ROOF ALLOWED TO ...
COAL : 4. Coal Mining and Production LONGWALL MINING TECHNIQUE COAL : 5. Coal Derivatives COAL : 6. Coal -. 139 LONGWALL ADVANCING MAIN SEAM WORKING FACE I LONGWALL RETREATING MAIN SEAM AIR AND MAIN SHAFTS MAIN PILLAR ROOF ALLOWED TO ...
Page 144
COAL LIQUEFACTION - COAL TAR COAST GUARD. 144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain a low - Btu gas . In this ap- proach , input- and ...
COAL LIQUEFACTION - COAL TAR COAST GUARD. 144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain a low - Btu gas . In this ap- proach , input- and ...
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