1980. Scale approximately 1:2,000,000. "Adapted from glacial map of Ohio, U.S. Geological Survey Miscellaneous geologic investigations, Map I-316." Title...
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2001. Ohio. Division of Geological Survey. Scale approximately 1:2,000,000. Text on verso: Glacial deposits of Ohio. "Publication date: 7/01"--Verso. Ohio. Division of Geological Survey.