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.; "July, 1979 base 4-R-37154." 74 x 58 centimeters. USDA-SCS (Fort Worth, Tex.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "April 1979 base 4-R-37033." 45 x 58 centimeters. USDA-SCS (Fort Worth, Tex.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "January 1980 4-R-22033." 57 x 72 centimeters. USDA-SCS (Fort Worth, Tex.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "April 1978 base 4-R-36585." 47 x 63 centimeters. USDA-SCS (Fort Worth, Tex.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "November 1979 base 4-R-37177." 57 x 72 centimeters. USDA-SCS (Fort Worth, Tex.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map.; "February 1980 base 4-R-37409." 57 x 44 centimeters. USDA-SCS (Fort Worth, Tex.).