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Geological map of the state of Pennsylvania : constructed from origina...
Relief shown by hachures. "To accompany the final report on the Geological Survey of the state 1858." "Entered according to act of Congress, in the year 1858, by Henry D. Rogers ... Eastern District of Pennsylv... More
Geological map of the state of Pennsylvania : constructed from origina...
Relief shown by hachures. "To accompany the final report on the Geological Survey of the state 1858." Originally published in 4 sheets. "Entered according to act of Congress, in the year 1858, by Henry D. Roger... More