Ohio. Division of Geological SurveyOSU's copy 1 gift of Dale Bertsch.Scale approximately 1:2,200,000State of Ohio, Department of Natural Resources, Division of Geological Survey.TIFFhttps://hdl.handle.net/1811/b815831b-ae7f-4af0-9973-9b2353fe79e3engOhio. Division of Geological SurveyPublicGeomorphologyPhysical geographyPhysiographic sections of OhioMapsOhiobetween 1970 and 1979The Ohio State University