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.; "Produced by the Geological Survey in cooperation with the Soil Conservation Service."; Includes vicinity map. 41 x 43 centimeters. The Service (Salina, Kan.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map. 51 x 51 centimeters. Soil Conservation Service (Washington, D.C.?).
1980. United States. Soil Conservation Service. Shows land use.; "Base map produced by the Geological Survey in cooperation with the Soil Conservation Service."; Includes vicinity map. 47 x 39 ce... The Service (Salina, Kan.).
1980. United States. Soil Conservation Service. Shows land use.; Includes vicinity map. 51 x 62 centimeters. Soil Conservation Service (Washington, D.C.?).