Historical sketch of geological explorations in Pennsylvania and other states with an appendix containing the annual reports of the State Geologist to the Board of Commissioners
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| Format: | Elektronisch E-Book |
| Sprache: | English |
| Veröffentlicht: |
Harrisburg, Pa.
Board of Commissioners for the Second Geological Survey
1876
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| Schriftenreihe: | Second Geological Survey of Pennsylvania
A = 1874-'5-'6 |
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| Online-Zugang: | kostenfrei |
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