| Author: | Roby, Robert N. |
|---|---|
| Year: | 1946 |
| Document Type: | BMRA |
| Issuing Agency: | United States Bureau of Mines, |
| SUDOC: | I 28.23:3939 |
| Series: | Report of investigations / Bureau of Mines ; |
| Report Number: | 3939 |
| Subject: | Copper ores--Montana--Madison County |
| Link: | https://hdl.handle.net/2027/mdp.39015078487900 |