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Falls of roof :the no. 1 killer in bituminous-coal mines
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Published Year
1950-1959 (1)
Subject
Bituminous coal industry--United States--Safety measures (1)
Coal mines and mining--United States--Safety measures (1)
Mine roof control--United States (1) *
Author
Back, T. L. (1)
Forbes, J. J. (1)
Weaver, H. F. (1)
