Investigation of the effects of thrust and hardened washers on the installed tension of a roof bolt / by Stephen G. Sawyer, George J. Karabin, and William J. Debevec ; Pittsburgh Technical Support Center.
| Author/creator | Sawyer, Stephen G. |
| Other author | Karabin, George J. author. |
| Other author | Debevec, William J. author. |
| Other author | United States. Mining Enforcement and Safety Administration. |
| Format | Book |
| Publication Info | [Washington] : U.S. Dept. of the Interior, Mining Enforcement and Safety Administration, [1976] |
| Description | [1], iii, 18 p. : ill. ; 27 cm. |
| Subjects |
| Series | MESA informational report IR ; 1031 United States. Mining Enforcement and Safety Administration. MESA informational report ; 1031. UNAUTHORIZED |
| GPO item number | 637-A |
| Govt. docs number | I 69.9:1031 |