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Multiple-shift mechanical mining in some bituminous-coal mines.
| Author: | Toenges, Albert L.. |
|---|---|
| Additional Authors: | Maize, Earl R. |
| Year: | 1941 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7178 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7178. |
| Subjects: | Bituminous coal |
| Coal mines and mining--Equipment and supplies | |
| Link: | https://hdl.handle.net/2027/mdp.39015078534693 |
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