1959. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water, from data compiled by Lawrence R. Brunstetter. Scale bar lower left corner. Text i... Ohio. Division of Water.
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1959. Walker, Alfred C. Map side also contains legend and explanation of map symbols. Scale bar lower right corner. "Prepared by ALFRED C. WALKER, Geologist, Ohio Division... Ohio. Division of Water.
1959. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water, from data compiled by Lawrence R. Brunstetter. Map side also contains legend and e... Ohio. Division of Water.