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List of permissible mine equipment approved to January 1, 1940
| Author: | Ilsley, L. C. |
|---|---|
| Year: | 1940 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7110 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7110. |
| Subjects: | Explosives |
| Coal mines and mining--Safety measures | |
| Link: | https://hdl.handle.net/2027/mdp.39015078534792 |
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