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Safety posters at the Calumet & Hecla mines
| Author: | Crawford, Frank Stevens |
|---|---|
| Year: | 1935 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:6827 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6827 |
| Subject: | Mine safety |
| Link: | https://hdl.handle.net/2027/mdp.39015086486142 |
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