1909. Bownocker, J. A. 1865-1928. Scale [1:506,880]. Eight miles to one in. Geologic formations shown by colors and symbols. "Based on preceding maps by Newberry and Orton." "A. Hoe... Geological Survey of Ohio.
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1920. Bownocker, J. A. 1865-1928. J.A. Bownocker, state geologist ; revisions of the geology of Ohio shown on this map are the work of J.A. Bownocker, W.G. Burroughs [etc.] ... W.D.... Geological survey of Ohio.
1947. 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... Ohio. Division of Geological Survey.