| Year: | 1966 |
|---|---|
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:8306 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 8306 |
| Subjects: | Coal mines and mining--Safety measures |
| Mine safety | |
| Mining engineering--Safety measures | |
| Coal mines and mining--research | |
| Link: | https://hdl.handle.net/2027/mdp.39015078514588 |