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.
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1956. Bier, James Allen. Scale 1:1,250,000. "Based primarily on U.S.G.S. topographic maps.". Ohio. Division of Geological Survey.