Author: | Olund, H. E. |
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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/ |