The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 137
... anthracite ( hard coal ) , which ranks at the top in the order of coals . The bituminous ( soft ) coals constitute less than half of the world stock . China , the Donets region of the Soviet Union , western Europe , and Britain have ...
... anthracite ( hard coal ) , which ranks at the top in the order of coals . The bituminous ( soft ) coals constitute less than half of the world stock . China , the Donets region of the Soviet Union , western Europe , and Britain have ...
Page 139
... anthracite mines during the same year the major causes of fatalities were likewise falls of roof , face , and ribs . The increase in safety has been due to inten- sive safety programs and the use of many safety devices . Reliable ...
... anthracite mines during the same year the major causes of fatalities were likewise falls of roof , face , and ribs . The increase in safety has been due to inten- sive safety programs and the use of many safety devices . Reliable ...
Page 141
... anthracite and bi- tuminous mining . The anthracite segment is limited almost entirely to northeastern Pennsyl- vania and operates under a state control board that schedules production and assigns shares to the separate operators . The ...
... anthracite and bi- tuminous mining . The anthracite segment is limited almost entirely to northeastern Pennsyl- vania and operates under a state control board that schedules production and assigns shares to the separate operators . The ...
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