| Author: | Ilsley, L. C. | 
|---|---|
| Additional Authors: | Gleim, E. J., Craven, F. | 
| Year: | 1933 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, | 
| SUDOC: | C 22.11:6690 | 
| Series: | Information circular / Bureau of Mines ; | 
| Report Number: | 6690 | 
| Subjects: | Coal mines and mining | 
| Coal-mining machinery--Safety | |
| Link: | https://hdl.handle.net/2027/mdp.39015077565086 |