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1. United States Telephone Area Code Boundaries, 2012

2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). United States Telephone Area Code Boundaries is a polygon theme representing the telephone area codes for the United States. They are also known a... Esri.

2. United States Telephone Area Code Boundaries, 2010

2010. Tele Atlas North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). United States Telephone Area Code Boundaries is a polygon theme representing the telephone area codes for the United States. They are also known as... ESRI.