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Suspension roof support.
Roof movement study of mechanized retreating longwall operation, Lancashire no. 15 mine, Bakerton, Cambria County, Pa.
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Published Year
1940-1949 (1)
1950-1959 (1)
Subject
Mine roof control (2) *
Longwall mining (1)
Mine roof bolting (1)
Author
Barry, A. J. (2) *
Metcalfe, Arthur. (1)
Thomas, Edward. (1)
Wojciechowski, J. J. (1)
