The Encyclopedia Americana, Volume 7Grolier Incorporated, 1996 - Encyclopedias and dictionaries |
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Page 133
... coal seams as low as 30 inches or to make bottom cuts ranging from 934 inches be- low the floor to 21 inches above . Each of the driving wheels has a separate transmission . COAL : 1. How Coal Was Formed COAL : 2. COAL BUREAU OF MINES ...
... coal seams as low as 30 inches or to make bottom cuts ranging from 934 inches be- low the floor to 21 inches above . Each of the driving wheels has a separate transmission . COAL : 1. How Coal Was Formed COAL : 2. COAL BUREAU OF MINES ...
Page 137
COAL : 4. Coal Mining and Production COAL MINING PROCEDURES COAL : 4. Coal Mining and Production 21 + 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 21 + COAL. RECOVERABLE COAL RESOURCES Soviet Union ( Mapped and explored ) Percent of world total In billion metric tons 2,950 68.5 % North ...
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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