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.; "Base map prepared by the Geological Survey in cooperation with the Soil Conservation Service."; Includes vicinity map.; On verso:... The Service (Columbia, S.C.).
1980. United States. Soil Conservation Service. Shows land use.; "Base map prepared by the Geological Survey in cooperation with the Soil Conservation Service."; Includes vicinity map. 71 x 51 ce... USDA-SCS (Fort Worth, Tex.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; On verso: text.; "July 1980 base 4-R-37462." 71 x 56 centimeters. The Service (Columbia, S.C.).