| Author: | Gross, John, |
|---|---|
| Year: | 1921 |
| Document Type: | MAIN |
| SUDOC: | I 28.23:2264 |
| Series: | Report of investigations / United States Department of the Interior, Bureau of Mines ; |
| Report Number: | 2264 |
| Subject: | Fluorspar |
| Link: | https://hdl.handle.net/2027/mdp.39015095268986 |