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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
| Author: | Hazen, W. F. |
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| Additional Authors: | Christy, E. J. |
| Year: | 1929 |
| Document Type: | MAIN |
| SUDOC: | C 22.11:6200 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6200 |
| Subject: | Coal mines and mining--Ohio |
| Link: | https://hdl.handle.net/2027/mdp.39015095078880 |
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