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Suspension roof support.

Roof bolting in the United States

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)

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