2001. "Publication date: 11/2001." Cross section color-coded for geologic time period represented within the geologic layers. Includes notes, color cross... Ohio. Department of Natural Resources.
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2001. Ohio. Division of Geological Survey. State of Ohio, Department of Natural Resources, Division of Geological Survey. "Publication date: 02/01." Scale not given. "Larger versions of this... Ohio. Department of Natural Resources.