The Encyclopedia Americana, Količine 1–30Bernard S. Cayne Grolier, 1981 |
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Stran 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 ...
Stran 137
Bernard S. Cayne. COAL : 4. Coal Mining and Production COAL MINING PROCEDURES COAL : 4. Coal Mining and Production TAL : 4. RECOVERABLE COAL RESOURCES ( Mapped and explored ) Percent of world total In billion metric tons Soviet Union ...
Bernard S. Cayne. COAL : 4. Coal Mining and Production COAL MINING PROCEDURES COAL : 4. Coal Mining and Production TAL : 4. RECOVERABLE COAL RESOURCES ( Mapped and explored ) Percent of world total In billion metric tons Soviet Union ...
Stran 144
Bernard S. Cayne. COAL LIQUEFACTION - COAL TAR 1 U. S. COAST GUARD COAST GUARD , United States. 144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain ...
Bernard S. Cayne. COAL LIQUEFACTION - COAL TAR 1 U. S. COAST GUARD COAST GUARD , United States. 144 UNDERGROUND GASIFICATION OF COAL The United States , Britain , and the Soviet Union have made tests to gasify coal under- ground to obtain ...
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