Author: | Cronk, A. H. |
---|---|
Year: | 1930 |
Document Type: | USBI |
Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
SUDOC: | C 22.11:6384 |
Series: | Information circular / United States. Bureau of Mines ; |
Report Number: | 6384 |
Subjects: | Fluorspar--Illinois |
Mines and mineral resources--Illinois | |
Link: | https://hdl.handle.net/2027/mdp.39015077576315 |