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Mechanical mining in some bituminous-coal mines.
| Author: | Shields, J. J. |
|---|---|
| Additional Authors: | Dowd, J. J., Haley, W. A. |
| Year: | 1957 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7813 |
| Series: | Information circular / United States. Bureau of Mines, ; |
| Report Number: | 7813 |
| Subjects: | Coal-mining machinery |
| Bituminous coal industry--United States | |
| Link: | https://hdl.handle.net/2027/mdp.39015078454157 |
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