Bownocker, J. A. 1865-1928J.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. Turnbull, chief draftsman.TIFFhttps://hdl.handle.net/1811/c94af076-cf6a-4842-ba29-dcf478e47122engGeological survey of OhioPublicGeologyGeologic map of OhioMapsOhioThe Ohio State University