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

Methods of development and pillar extraction in mining the Pittsburgh coal bed in Pennsylvania, West Virginia, and Ohio

Published Year

• 1930-1939 (2) *

Subject

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

Author

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

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