1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map dated 1976; interpretations derived from soil map constructed 1975.; "Projection and 10,000-metre grid ... 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.).
1980. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base dated 1977; interpretations derived from soil map constructed 1971.; "Projection and 10,000 meter grid tick... Dept. of Agriculture, Soil Conservation Service (Washington.).
1979. United States. Soil Conservation Service. Base compiled in 1976 from USGS 1:24 000-scale topographic maps dated 1960-1972, revised from aerial photographs taken 1975; interpretations derive... Dept. of Agriculture, Soil Conservation Service (Washington.).
1979. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map compiled in 1977 from USGS 1:24,000 topographic maps dated 1970-1973; interpretations derived from soil... Dept. of Agriculture, Soil Conservation Service (Washington.).
1979. United States. Soil Conservation Service. Base compiled in 1976 from USGS 1:24 000 and 1:62 500-scale topographic maps dated 1922-1971, revised from aerial photographs taken 1974 and 1977; ... 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. Base compiled from USGS 1:24 000-scale topographic maps dated 1968-1975, map edited 1978, revised from aerial photographs taken 1975; interpretatio... Dept. of Agriculture, Soil Conservation Service (Washington.).
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.).