1987. Risser, Michele. Relief shown by contour lines and spot heights. Includes references. Scale 1:63,360 Includes text, 2 tables, and location map. by Michele L. Risser... Ohio. Division of Geological Survey.
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1987. Hull, Dennis N. 1948-. Relief shown by contour lines and spot heights. Includes text, bibliography, index and location map. by Dennis N. Hull. Scale approximately 1:63,36... Ohio. Division of Geological Survey.