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- Environmental Systems Research Institute (Redlands, Calif.)19
- United States Geological Survey18
- United States. Bureau of Transportation Statistics16
- Economic and Social Research Institute (Reston, Va.)13
- Digital Social Science Centaer, Columbia University Libraries11
- National Climatic Data Center (U.S.)11
- United States. National Environmental Satellite, Data, and Information Service11
- United States. National Oceanic and Atmospheric Administration.11
- ESRI6
- National Atlas of the United States and the United States Geological Survey6
- Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)5
- Tele Atlas North America, Inc.5
- TomTom North America, Inc.4
- Federal Railroad Administration (FRA)3
- United States. Army. Corps of Engineers.3
- Esri2
- FHWA2
- Federal Highway Administration (FHWA)2
- International Steering Committee for Global Mapping (ISCGM)2
- Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey2