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Cartography Associates. David Rumsey Collection. Gray, O. W. (Ormando Wyllis), 1829-1912. Stedman, Brown & Lyon.. Walling, Henry Francis, 1825-1888. (1872). Geological Map of Ohio. [JPEG]. Retrieved from https://geo.nyu.edu/catalog/06f5c514-4ba5-4efa-bfec-e8c3898e0fc7