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- Environmental Systems Research Institute (Redlands, Calif.)[remove]53
- Geological Survey (U.S.)18
- TomTom North America, Inc.10
- National Atlas of the United States8
- Tele Atlas (Firm : U.S.)5
- TomTom International (Firm)3
- U.S. Census Bureau, Geography Division2
- United States. Bureau of Transportation Statistics2
- United States. Environmental Protection Agency2
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- United States Geological Survey1
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