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Some check in and out systems for coal mines
| Author: | Currie, R. D. |
|---|---|
| Year: | 1930 |
| Document Type: | MAIN |
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, |
| SUDOC: | C 22.11:6281 |
| Series: | Information circular ; |
| Report Number: | 6281 |
| Subject: | Coal mines and mining--Safety measures |
| Link: | https://hdl.handle.net/2027/mdp.39015095083708 |
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