1979. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map dated 1978.; "Projection and 10,000-meter grid ticks, zone 14: Universal Transverse Mercator. 25,000-fo... Dept. of Agriculture, Soil Conservation Service (Washington.).
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1979. United States. Soil Conservation Service. "Source: Family of maps SCS drwg. no. 5,S-36,179 (2-77) and information from SCS field personnel."; "Lambert conformal conic projection."; "5,R-37,... Dept. of Agriculture, Soil Conservation Service (Washington.).
1977. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map compiled in 1975; interpretations derived from soil map constructed 1964.; "Projection and 10,000-metre... 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.).