Bownocker, J. A. 1865-1928"First printing 1920, reprinted 1929. Reprinted 1947 with revision of glacial boundary by G.W. White and with changes in base map."compiled by J.A. Bownocker.Scale 1:500,000.Geologic formations shown by colors and symbols.Includes geologic cross section with a vertical scale of 1:19,200.TIFFhttps://hdl.handle.net/1811/961977b4-8e8f-4d18-8397-c315602a7c18engOhio. Division of Geological SurveyPublicGeologyGeologic map of OhioMapsOhioThe Ohio State University