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.; Sheet 1 of 2; shows northern portion.; "May 1980."; Includes vicinity map. sheets 90 x 54 centimeters. The Service (Washington, D.C.?).