| Author: | Olund, H. E. |
|---|---|
| Year: | 1950 |
| Document Type: | N/A |
| SUDOC: | I 28.27:7536 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | I. C. 7536 |
| Subjects: | Copper industry and trade -- United States. |
| Lead industry and trade -- United States. | |
| Zinc industry and trade -- United States. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc67044/ |