| Author: | Denny, Edward H. | 
|---|---|
| Year: | 1936 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.27:6925 | 
| Series: | Information circular / United States Department of the Interior, Bureau of Mines ; | 
| Report Number: | 6925 | 
| Subjects: | Mines and mineral resources | 
| Mine safety | |
| Mine accidents | |
| Link: | https://hdl.handle.net/2027/mdp.39015077569062 |