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1. Geological map of the state of Pennsylvania : constructed from original surveys made between 1836 and 1857 (Scanned Map)

1836. Digital Social Science Center (DSSC), Columbia University Libraries, Rogers, Henry D. 1808-1866. (Henry Darwin), and W. & A.K. Johnston Limited. ; Geological Survey of Pennsylvania. This is a scanned version of the paper map entitled: Geological map of the state of Pennsylvania : constructed from original surveys made between ... Pennsylvania Geological Survey.