1977. United States. Soil Conservation Service. Universal Transverse Mercator projection; 1927 North American datum.; Mar. 1977.; Indexed. 112 x 92 centimeters 1:50,000. Dept. of Agriculture, Soil Conservation Service (Washington.).
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1977. United States. Soil Conservation Service. Universal Transverse Mercator projection; 1927 North American datum.; June 1977.; Indexed. 112 x 92 centimeters 1:50,000. Dept. of Agriculture, Soil Conservation Service (Washington.).
1979. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map compiled in 1976; interpretations derived from soil map constructed 1972.; "Projection and 10,000-meter... Dept. of Agriculture, Soil Conservation Service (Washington.).
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.).