You searched for: Subject Administrative and political divisions Remove constraint Subject: Administrative and political divisions Place Maine Remove constraint Place: Maine Year 1990 Remove constraint Year: 1990
1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
1990. The polygons represent U.S. Census Block Groups for the state based on the ground condition of January 1, 1990. Block Groups (BGs) are clusters of ...