1984. Hull, Dennis N. by Dennis N. Hull ; cartographic drafting by Leonard M. Guckenheimer and Katherine L. Jennings. Includes location map. Includes bibliography. Ohio. Division of Geological Survey.
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1978. Crowell, Katie. Includes "Index map." Scale approximately 1:63,000. Relief shown by contours and spot heights. by Katie Crowell ; cartography, Tarry A. Crumley. Ohio. Division of Water.