NYU Spatial Data Repository

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1. County Boundaries of the United States, 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.).

2. UA Census Block Groups, 2000 - Maine

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 ...