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.
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1987. Hull, Dennis N. "Contour interval is 10 feet." by Dennis N. Hull. Includes text, bibliography, index and location map. Scale approximately 1:63,360 Relief shown by... Ohio. Division of Geological Survey.