| Year: | 1963 |
|---|---|
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:8149 |
| Series: | Information Circular / Bureau of Mines ; |
| Report Number: | 8149 |
| Subjects: | Coal mines and mining--Safety measures |
| Mining law--United States | |
| Link: | https://hdl.handle.net/2027/mdp.39015077564386 |