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Studies of roof movement in coal mines.
Suspension roof support.
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Published Year
1940-1949 (2)
Subject
Mine roof control (2) *
Coal mines and mining (1)
Mine roof bolting (1)
Author
Thomas, Edward. (2) *
Barry, A. J. (1)
Greenwald, H. P. (1)
Maize, Earl R. (1)
Metcalfe, Arthur. (1)
