| Author: | Henn, John J. | 
|---|---|
| Additional Authors: | Kirby, Ralph C., Norman, Lindsay D. | 
| Year: | 1968 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.27:8368 | 
| Series: | Information circular / United States Department of the Interior, Bureau of Mines ; | 
| Report Number: | 8368 | 
| Subject: | Manganese ores | 
| Link: | https://hdl.handle.net/2027/mdp.39015078516708 |