1979. Crowell, Katie. Includes location map. by Katie Crowell (after Winslow, John D., 1953) ; cartography, Craig A. Schottenstein. Scale approximately 1:63,000. Relief ... Ohio. Division of Water.
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1975. Guy, Donald E. Description based on 52. Ohio Division of Geological Survey. Includes both texts and maps. Ohio. Division of Geological Survey.