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Multiple-shift mechanical mining in some bituminous coal mines.
| Author: | Toenges, Albert L. |
|---|---|
| Additional Authors: | Jones, Frank A. |
| Year: | 1939 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| Series: | Information circular / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 7067 |
| Subject: | Coal mines and mining |
| Link: | https://hdl.handle.net/2027/mdp.39015077570540 |
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