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.; Includes vicinity map.; "October 1979 base 4-R-37164." 57 x 77 centimeters. USDA-SCS (Fort Worth, Tex.).