| Author: | Ageton, Robert W. |
|---|---|
| Year: | 1967 |
| Document Type: | N/A |
| SUDOC: | I 28.23:6997 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | R. I. 6997 |
| Subjects: | Mining engineering. |
| Rock pressure. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc38712/ |