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1. United States Airports, 2012

2001. National Atlas of the United States and the United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). United States Airports is a point theme representing airports in the United States, Puerto Rico, U.S. Virgin Islands, and U.S. Possessions with air... Esri.

2. U.S. ZIP Code Points 2002

2001. Geographic Data Technology, Inc. (GDT). U.S. ZIP Code Points represents five-digit ZIP Code areas as points by placing the location using delivery based centroids and those ZIP Codes that... Environmental Systems Research Institute, Inc. (ESRI).