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Esri
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structures
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Columbia
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1. United States Airports, 2012
2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). United States Airports is a polygon theme representing airport grounds and airport runways within the United States. All airports have a boundary, ... Esri.
2. United States Schools, 2012
1981. United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). United States Schools is a point theme representing schools in the United States. . Esri.