| Author: | Barczak, Thomas M. | 
|---|---|
| Additional Authors: | Schwemmer, David E. | 
| Year: | 1990 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.23:9327 | 
| Series: | Report of investigations / United States. Bureau of Mines ; | 
| Report Number: | 9327 | 
| Subjects: | Longwall mining | 
| Mine roof control | |
| Link: | https://hdl.handle.net/2027/mdp.39015078479295 |