| Author: | Duvall, Wilbur I. | 
|---|---|
| Additional Authors: | Blake, Wilson. | 
| Year: | 1967 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.23:7030 | 
| Series: | Report of investigations / United States Department of the Interior, Bureau of Mines ; | 
| Report Number: | 7030 | 
| Subjects: | Mining machinery | 
| Tunneling | |
| Strains and stresses | |
| Link: | https://hdl.handle.net/2027/mdp.39015078531517 |