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[Illustrations: Buried Valley of the Susquehanna River: Anthracite Region of Pennsylvania]
| Year: | 1950 |
|---|---|
| Document Type: | N/A |
| SUDOC: | 28.3:494 |
| Series: | United States Bureau of Mines Reports |
| Report Number: | Bulletin 494 |
| Subjects: | Anthracite coal mines and mining -- Pennsylvania. |
| Geology -- Susquehanna River Valley. | |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc12440/ |
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