1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base compiled in 1977; interpretations derived from soil map constructed 1974.; "Projection and 10,000-metre gri... Dept. of Agriculture, Soil Conservation Service (Washington.).
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1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base compiled in 1973; interpretations derived from soil map constructed 1972.; "Projection and 10,000-metre gri... Dept. of Agriculture, Soil Conservation Service (Washington.).
1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base compiled in 1976; interpretations derived from soil map constructed 1972.; "Projection and 10,000-metre gri... Dept. of Agriculture, Soil Conservation Service (Washington.).