1961. Schmidt, James J. Scale bar lower left corner of map. Text includes information about generalized stratigraphic sequence of the rocks in the Walnut Creek Basin and q... Ohio. Division of Water.
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1959. Schmidt, James J. Map side also contains legend and explanation of map symbols. Scale bar lower right corner of map. "Prepared by JAMES J. SCHMIDT, Geologist, Ohio D... Ohio. Division of Water.