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.; "November 1980."; Accompanied by: Fact sheet.; Includes location map. 79 x 87 centimeters Scale 1:100,000. The Service (Bozeman, Mont.?).
1980. United States. Soil Conservation Service. Shows land use.; "December 1980."; Accompanied by: Fact sheet.; Includes location map. 111 x 98 centimeters Scale 1:100,000. The Service (Bozeman, Mont.?).
1980. United States. Soil Conservation Service. Shows land use.; Accompanied by: Fact sheet.; Includes location map. 56 x 43 centimeters Scale 1:100,000. USDA-SCS (Portland, Or.).
1980. United States. Soil Conservation Service. Shows land use.; June 1980.; Accompanied by: Fact sheet.; Includes location map. 122 x 102 centimeters Scale 1:100,000. 1 cm. to 1 km. The Service (Bozeman, Mont.?).