| Author: | Powell, James A. | 
|---|---|
| Additional Authors: | Watson, Richard A., | 
| Year: | 1976 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.23:8158 | 
| Series: | Report of investigations - Bureau of Mines ; | 
| Report Number: | 8158 | 
| Subjects: | Mine safety | 
| Mine communication systems | |
| Link: | https://hdl.handle.net/2027/mdp.39015078474445 |