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- United States. Bureau of Transportation Statistics6
- Environmental Systems Research Institute (Redlands, Calif.)5
- National Atlas of the United States4
- Geological Survey (U.S.)3
- Tele Atlas B.V.3
- Battelle Memorial Institute1
- Canada Centre for Remote Sensing1
- ESRI1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- Jessberger, Steven1
- John A. Volpe National Transportation Systems Center (U.S.)1
- Miller, David1
- Strocko, Ed1
- Tele Atlas North America, Inc.1
- TomTom International (Firm)1
- TomTom North America, Inc.1
- United States. Federal Highway Administration1
- United States. Federal Highway Administration. Office of Highway Policy Information1