1986. Walker, Alfred C. "Total copies printed: 500." by Alfred C. Walker ; cartography, by David S. Orr. Scale 1:62,500 Relief shown by contours and spot heights. Includes... Ohio. Department of Natural Resources.
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1986. Walker, Alfred C. by Alfred C. Walker ; cartography, David S. Orr. "Total copies printed: 500." Scale 1:62,500 Relief shown by contours and spot heights. Includes lo... Ohio. Department of Natural Resources.
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.
1986. Walker, Alfred C. by Alfred C. Walker ; cartography, David S. Orr. Includes location map. Scale 1:62,500 Relief shown by contours and spot heights. "Total copies pri... Ohio. Department of Natural Resources.
1985. Walker, Alfred C. Includes location map. by Alfred C. Walker. Relief shown by contours and spot heights. Scale 1:135,000. Ohio. Department of Natural Resources.