| Author: | Kingery, D. S. |
|---|---|
| Year: | 1952 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | i 28.27:7638 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 7638 |
| Subjects: | Coal mines and mining--Safety measures |
| Shuttle cars (Mine haulage)--Safety measures | |
| Link: | https://hdl.handle.net/2027/mdp.39015078455865 |