The Encyclopedia Americana, Volume 7Grolier, 1989 - Encyclopedias and dictionaries |
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Page 137
COAL : 4. Coal Mining and Production COAL MINING PROCEDURES COAL : 4. Coal Mining and Production 1 COAL : 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 1 COAL : RECOVERABLE COAL RESOURCES Soviet Union ( Mapped and explored ) Percent of world total In billion metric tons 2,950 68.5 % North ...
Page 141
COAL : 6. Coal - Mining Industry COAL GASIFICATION COAL GASIFICATION COAL LIQUEFACTION - COAL TAR. In order of rank , the ten leading coal - pro- ducing countries in the mid - 1970's were the Soviet Union , the United States , China ...
COAL : 6. Coal - Mining Industry COAL GASIFICATION COAL GASIFICATION COAL LIQUEFACTION - COAL TAR. In order of rank , the ten leading coal - pro- ducing countries in the mid - 1970's were the Soviet Union , the United States , China ...
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 mech- anization requires the ...
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 mech- anization requires the ...
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