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- Environmental Systems Research Institute (Redlands, Calif.)78
- TomTom North America, Inc.19
- DeLorme Publishing Company, Inc.10
- National Atlas of the United States and the United States Geological Survey9
- United States Geological Survey9
- Esri5
- Michael Bauer Research GmbH4
- U.S. Department of Commerce, Census Bureau, Esri3
- Bureau of Transportation Statistics2
- Economic and Social Research Institute (Reston, Va.)2
- U.S. Census Bureau, Geography Division2
- World Wildlife Fund2
- Department of Commerce, Census Bureau, Geography Division1
- Environmental Systems Research Institute (Redlands, Calif.)i1
- Federal Railroad Administration (FRA)1
- National Park Service1
- Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey1
- U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency1