| Author: | Breckon, L. S.. |
|---|---|
| Year: | 1940 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7128 |
| Series: | Information circular / United States. Department of the Interior, Bureau of Mines ; |
| Report Number: | 7128 |
| Subjects: | Tunneling |
| Tunnels--Utah--Copperfield | |
| Tunnels--Utah--Bingham | |
| Link: | https://hdl.handle.net/2027/mdp.39015095086388 |