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Recommended safety standards for shaft sinking :(revision of IC 7810)
| Year: | 1968 |
|---|---|
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:8365 |
| Series: | Information circular / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 8365 |
| Subjects: | Coal mines and mining--Safety measures--Standards--United States |
| Shaft sinking--Safety measures--Standards--United States | |
| Link: | https://hdl.handle.net/2027/mdp.39015078516732 |
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