1998. Hansen, Michael C. Text, satellite image of southern Ohio and 2 block diagrams. Panel title. Scale not given. by Michael C. Hansen. "Publication date: 8/98.". 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.