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Control of roof and prevention of accidents from falls of rock and coal :suggested roof supports for use at faces in conjunction with mechanical loading
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Published Year
1940-1949 (1)
Subject
Coal mines and mining--Safety measures (1)
Tunneling--Equipment and supplies (1) *
Author
Hansen, M.V. (1)
Perz, Frank. (1) *
Seeling, C.H. (1)
Thomas, Edward. (1)
