1979. United States. Soil Conservation Service. Base compiled in 1976 from USGS 1:24,000-scale topographic maps dated 1965-68; planimetry revised from aerial photographs taken 1974.; "Projection ... Dept. of Agriculture, Soil Conservation Service (Washington.).
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1987. Struble, Richard A. Includes text, 3 tables, location map, and water-well logs. by Richard A. Struble ; cartographic drafting by Lisa Van Doren. Relief shown by contou... Ohio. Division of Geological Survey.