1960. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water Text includes information about generalized stratigraphic sequence of the rocks in ... Ohio. Division of Water.
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1960. Walker, Alfred C. Scale bar lower left corner of map. "Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water" Map side also contains legend and explanation... Ohio. Division of Water.