| Author: | Ridgway, Robert H. |
|---|---|
| Year: | 1931 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | C 22.11:6523 |
| Series: | Information Circular / Bureau of Mines ; |
| Report Number: | 6523 |
| Subject: | Pyrites |
| Link: | https://hdl.handle.net/2027/mdp.39015077561796 |