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

A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district

Published Year

• 1930-1939 (2)

Subject

• Coal mines and mining--Pennsylvania (2) *
• Mine timbering (2) *
• Coal mines and mining--Ohio (1)
• Coal mines and mining--West Virginia (1)

Author

• Paul, J. W. (2)
• Calverley, Joseph Gladstone, (1)
• Plein, Leopold Nicholas, (1)
• Sibray, Donald Loammi, (1)

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