You searched for: Author Geological Survey (U.S.) Remove constraint Author: Geological Survey (U.S.) Place Massachusetts Remove constraint Place: Massachusetts Place United States Remove constraint Place: United States Place Arkansas Remove constraint Place: Arkansas Format Shapefile Remove constraint Format: Shapefile Year 1980 Remove constraint Year: 1980
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.).