| Author: | Unger, Richard L. | 
|---|---|
| Year: | 1989 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.23:9246 | 
| Series: | Report of investigations / United States. Bureau of Mines ; | 
| Report Number: | 9246 | 
| Subjects: | Coal mines and mining--Equipment and supplies--Design and construction | 
| Mine railroads--Track maintenance vehicles--Design and construction | |
| Link: | https://hdl.handle.net/2027/mdp.39015078477125 |