1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
    
  
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      1980. United States. Soil Conservation Service. Shows land use.; "Interpretations derived from soil map constructed 1979 by Cartographic Division, Soil Conservation Service, USDA, of the State of... The Service (Washington, D.C.?).