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You searched for: Author Geographic Data Technology, Inc. (GDT) Remove constraint Author: Geographic Data Technology, Inc. (GDT) Subject Utilities and Communication Remove constraint Subject: Utilities and Communication Institution Princeton Remove constraint Institution: Princeton
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1. U.S. Telephone Area Code Boundaries 2002

2002. Geographic Data Technology, Inc. (GDT). U.S. Telephone Area Code Boundaries represents the telephone area codes for United States. They are also known as Numbering Plan Areas (NPA). Environmental Systems Research Institute, Inc. (ESRI).