The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1962 - Encyclopedias and dictionaries |
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Page 152
... coal is obtained from underground mines . The two principal systems employed in mining underground coal are the room - and - pillar method and the longwall method . In the first method pillars of coal are left to support the roof and ...
... coal is obtained from underground mines . The two principal systems employed in mining underground coal are the room - and - pillar method and the longwall method . In the first method pillars of coal are left to support the roof and ...
Page 157
... coal for railroad fuel declined sharply . The Class 1 railroads , which required 132 million tons of coal in 1944 , pur- chased only 12,308,000 tons in 1956 . A similar trend is seen in retail dealer de- liveries , which means ...
... coal for railroad fuel declined sharply . The Class 1 railroads , which required 132 million tons of coal in 1944 , pur- chased only 12,308,000 tons in 1956 . A similar trend is seen in retail dealer de- liveries , which means ...
Page 158
... Coal Resources of the United States , U.S. Geological Survey Circular 293 ( Washington 1953 ) ; National Coal Association , Bituminous Coal Trends , 1956 ( Washington ) ; American Mining Congress , Year Book on Coal Mine Modernization ...
... Coal Resources of the United States , U.S. Geological Survey Circular 293 ( Washington 1953 ) ; National Coal Association , Bituminous Coal Trends , 1956 ( Washington ) ; American Mining Congress , Year Book on Coal Mine Modernization ...
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Bibliographic information
| Title | The Encyclopedia Americana: The International Reference Work, Volume 7 The Encyclopedia Americana: The International Reference Work |
| Publisher | Americana Corporation, 1962 |
| Original from | Rutgers University |
| Digitized | 17 Nov 2022 |
| Export Citation | BiBTeX EndNote RefMan |