1993. Hull, Dennis N. 1948-. Includes descriptive index to roadside geological features. Scale approximately 1:750,000. "Publication date: 5/93." by Dennis N. Hull. Panel title... Ohio. Division of Geological Survey.
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1993. Hansen, Michael C. Scale not given. Panel title. by Michael C. Hansen. Text, satellite image of southern Ohio and 2 block diagrams. "Publication date: 8/93.". Ohio. Division of Geological Survey.