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.).
    
  
Search Results
    
      1980. United States. Soil Conservation Service. Shows land use.; Sheet 2 of 2; shows eastern portion.; "September 1980."; Includes vicinity map and inset.; "1-16370." 22 x 102 centimeters. The Service (Orono, Maine.?).