1959. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water, from data compiled by Lawrence R. Brunstetter. Scale bar lower right corner of map... Ohio. Division of Water.
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1961. Walker, Alfred C. Prepared by ALFRED C. WALKER, Geologist, Ohio Division of Water Map side also contains legend and explanation of map symbols. Scale bar lower right... Ohio. Division of Water.
1916. Sherman, C. E. (Christopher Elias), 1869-1940. Scale approximately1:31 680. "March 20, 1916." "Map no. 1." Includes legend. report of C.E. Sherman.