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Safety practices in tunneling operations at the Hetch Hetchy Water-supply Project, City and County of San Francisco, Calif.
| Author: | Ash, S. H. |
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| Additional Authors: | Rankin, Carl R. |
| Year: | 1933 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Bureau of Mines, |
| SUDOC: | I 28.27:6726 |
| Series: | Information Circular / Bureau of Mines ; |
| Report Number: | 6726 |
| Subject: | Tunneling--Safety measures |
| Link: | https://hdl.handle.net/2027/mdp.39015077572355 |
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