| Author: | Needham, A. B. | 
|---|---|
| Year: | 1950 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.23:4693 | 
| Series: | Report of investigations / United States Department of the Interior, Bureau of Mines ; | 
| Report Number: | 4693 | 
| Subjects: | Mica--South Dakota--Custer County | 
| Mine examination--South Dakota--Custer County | |
| Link: | https://hdl.handle.net/2027/mdp.39015078504225 |