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Suspension roof support.
Roof bolting in the United States
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Published Year
1940-1949 (1)
1950-1959 (1)
Subject
Mine roof bolting (2) *
Coal mines and mining--United States--Safety measures (1)
Mine roof control (1)
Author
Thomas, Edward. (2) *
Barry, A. J. (1)
Metcalfe, Arthur. (1)
