The Encyclopedia Americana, Volume 7Grolier, 1994 - 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 Soviet Union ( Mapped and explored ) Percent of world total In billion metric tons 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 Soviet Union ( Mapped and explored ) Percent of world total In billion metric tons 2,950 68.5 % North ...
Page 142
COAL GASIFICATION COAL GASIFICATION COAL LIQUEFACTION - COAL TAR. 142 tors had strong competitive reasons to keep costs and prices low by raising productivity . The increasing refuse that accompanies mechanization requires the processing ...
COAL GASIFICATION COAL GASIFICATION COAL LIQUEFACTION - COAL TAR. 142 tors had strong competitive reasons to keep costs and prices low by raising productivity . The increasing refuse that accompanies mechanization requires the processing ...
Page 144
COAL LIQUEFACTION - COAL TAR COAST GUARD. 144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the ... coal is heated to success- ively higher temperatures in a series of fluidized- bed reactors . After further ...
COAL LIQUEFACTION - COAL TAR COAST GUARD. 144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the ... coal is heated to success- ively higher temperatures in a series of fluidized- bed reactors . After further ...
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