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Methods of development and pillar extraction in mining the Pittsburgh coal bed in 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)
• Mining engineering (1) *

Author

• Paul, J. W. (1)
• Plein, Leopold Nicholas, (1)

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