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Roof-bolt recovery in the middle west
| Author: | Kelly, L. W. |
|---|---|
| Year: | 1958 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, ; |
| SUDOC: | I 28.27:7826 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 7826. |
| Subject: | Mine roof bolting |
| Link: | https://hdl.handle.net/2027/mdp.39015078453977 |
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