| Author: | Rad, Parviz F. | 
|---|---|
| Additional Authors: | Olson, Richard C., | 
| Year: | 1974 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Bureau of Mines | 
| SUDOC: | I 28.23:7882 | 
| Series: | Report of investigations / United States. Bureau of Mines ; | 
| Report Number: | 7882 | 
| Subjects: | Mining machinery | 
| Boring machinery | |
| Tunneling--Equipment and supplies | |
| Link: | https://hdl.handle.net/2027/mdp.39015078539296 |