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1. United States Airports, 1991-2014

1991. TomTom International (Firm) and Environmental Systems Research Institute (Redlands, Calif.). Thisw polygon shapefile represents airport grounds and airport runways within the United States. All airports have a boundary, and most have at lea... Environmental Systems Research Institute (Redlands, Calif.).

2. United States Income and Employment 1991-1992

1991. National Atlas of the United States. This map layer portrays 1991 and 1992 estimates for total personal income, per capita personal income, annual number of full-time and part-time job... National Atlas of the United States.

3. Wetland resources of the United States, 1991

1991. Digital Social Science Center (DSSC), Columbia University Libraries, National Wetlands Inventory (U.S.), Dahl, Thomas E., U.S. Fish and Wildlife Service., and Geological Survey (U.S.). This is a scanned version of the 1991 paper map entitled: Wetland resources of the United States published by the United States Fish and Wildlife S... The Service.