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Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio

Published Year

• 1930-1939 (1)

Subject

• Coal mines and mining--Ohio (1) *
• Coal mines and mining--Pennsylvania (1)
• Coal mines and mining--West Virginia (1)
• Mine timbering (1) *

Author

• Calverley, Joseph Gladstone, (1)
• Paul, J. W. (1)
• Sibray, Donald Loammi, (1)

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