| Author: | Forbes, John J. V. | 
|---|---|
| Additional Authors: | Fene, W. J. | 
| Year: | 1950 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.27:7562 | 
| Series: | Information circular / United States Department of the Interior, Bureau of Mines ; | 
| Report Number: | 7562 | 
| Link: | https://hdl.handle.net/2027/mdp.39015078455568 |