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Geology and Mineral Resources of the Butler and Zelienople Quadrangles, Pennsylvania
| Author: | Richardson, G. B. |
|---|---|
| Year: | 1936 |
| Document Type: | N/A |
| SUDOC: | I 19.3:873 |
| Series: | U.S. Geological Survey bulletin |
| Report Number: | USGS Bulletin 873 |
| Subjects: | Geology. |
| Mines and mineral resources. | |
| Geology -- Pennsylvania. | |
| Mines and mineral resources -- Pennsylvania. | |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc304256/ |
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