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A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district
A study of mine roof of the coking district of Western Pennsylvania
Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio
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Published Year
1930-1939 (3) *
Subject
Coal mines and mining--Pennsylvania (3)
Coal mines and mining--Ohio (1)
Coal mines and mining--West Virginia (1)
Coke--Pennsylvania (1)
Industrial accidents--Pennsylvania (1)
Mine safety--Pennsylvania (1)
Mine timbering (1)
Mining engineering (1)
Author
Paul, J. W. (3)
Plein, Leopold Nicholas, (3) *
