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Method and cost of mining the Pittsburgh, or no. 8, coal bed in a 100 percent mechanized mine in eastern Ohio

Method and cost of mining the Pittsburgh, or no. 8, coal bed in four eastern Ohio mines

Published Year

• 1920-1929 (2) *

Subject

• Coal mines and mining--Ohio (2) *

Author

• Christy, E. J. (1)
• Hazen, W. F. (1)
• Paul, J. W. (1)
• Tomlinson, H. (1)

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