| Author: | Brichta, Louis Chanborn |
|---|---|
| Year: | 1960 |
| Document Type: | N/A |
| SUDOC: | I 28.27:7993 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | I. C. 7993 |
| Subjects: | Borings -- United States. |
| Lead mines and mining -- United States. | |
| Zinc mines and mining -- United States. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc170724/ |