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Studies of roof movement in coal mines.
Studies of roof movement in coal mines.
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Published Year
1930-1939 (1)
1940-1949 (1)
Subject
Coal mines and mining--Pennsylvania (2) *
Mine roof control (1)
Mine subsidence (1)
Author
Greenwald, H. P. (2) *
Hartmann, Irving (1)
Maize, E. R. (1)
Maize, Earl R. (1)
Rice, G. S. (1)
Thomas, Edward. (1)
