1991. Walker, Alfred C. Scale approximately 1:63,000. by Alfred C. Walker ; Xiaoning Jiang, cartographer.
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1991. Walker, Alfred C. "2/91." "Total copies printed: 500." Scale approximately 1:62,500 Relief shown by contours and spot heights. by Alfred C. Walker ; Xiaoning Jiang, ... Ohio. Department of Natural Resources.
1991. Schmidt, James J. Includes location map. Scale approximately 1:62,500 Relief shown by contours and spot heights. by James J. Schmidt ; Robert L. Stewart, cartographe... Ohio. Division of Water.