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Analyses of Pennsylvania bituminous coals :supplement to Technical Paper 590
Fire fighting facilities at four Pennsylvania bituminous-coal mines
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Published Year
1940-1949 (2) *
Subject
Bituminous coal--Pennsylvania (2) *
Coal mines and mining--Pennsylvania--Safety measures (1)
Author
Grove, G. W. (1)
Simpson, O. V. (1)
Snyder, Ned H. (1)
Swingle, Robert Johnston, (1)
