1980. United States. Soil Conservation Service. Important farmlands in Warren County. Map color coded by prime, unique and additional farmland, water areas and urban and built-up areas. Land data... U. S. Government Printing Office.
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1980. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map dated 1976; interpretations derived from soil map constructed 1977.; "Projection and 10,000-meter grid ... Dept. of Agriculture, Soil Conservation Service (Washington.).
1980. United States. Soil Conservation Service. Base source: USGS county base map dated 1975; interpretations derived from soil map constructed 1970.; "Projection and 10,000-metre grid ticks, zon... Dept. of Agriculture, Soil Conservation Service (Washington.).
1980. United States. Soil Conservation Service. "Interpretations derived from soil map constructed 1974."; May 1980.; Includes location map. 61 x 66 centimeters Scale approximately 1:100,000. Dept. of Agriculture, Soil Conservation Service (Washington.).
1980. United States. Soil Conservation Service. "Interpretations derived from soil map constructed 1978."; May 1980.; Includes location map. 50 x 61 centimeters Scale 1:100,000. Dept. of Agriculture, Soil Conservation Service (Washington.).
1978. United States. Soil Conservation Service. Universal Transverse Mercator projection; 1927 North American datum.; Jan. 1978.; Indexed. 92 x 112 centimeters Scale 1:50,000. Dept. of Agriculture, Soil Conservation Service (Washington.).