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Longwall mining in bituminous coal mines with planers, shearer- loaders, and self-advancing hydraulic roof supports
| Author: | Shields, J. J. |
|---|---|
| Year: | 1967 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:8321 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 8321 |
| Subjects: | Coal-mining machinery |
| Mining engineering | |
| Longwall mining--Equipment and supplies | |
| Link: | https://hdl.handle.net/2027/mdp.39015078514414 |
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