1959. Walker, Alfred C. Text includes information about generalized stratigraphic sequence of the rocks in the Tiffin Basin and the quality of underground water. Map side ... Ohio. Division of Water.
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1959. Walker, Alfred C. Map side also contains legend and explanation of map symbols. "Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water, from data compiled ... Ohio. Division of Water.
1959. Walker, Alfred C. Map side also contains legend and explanation of map symbols. Text includes information about generalized stratigraphic sequence of the rocks in th... Ohio. Division of Water.
1962. Stein, Russell B. Prepared by RUSSELL B. STEIN, Geologist, Ohio Division of Water Text includes information about generalized stratigraphic sequence of the rocks in ... Ohio. Division of Water.