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- Environmental Systems Research Institute (Redlands, Calif.)19
- United States Geological Survey18
- TomTom North America, Inc.13
- National Atlas of the United States and the United States Geological Survey12
- 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
- Tele Atlas B.V.8
- Tele Atlas North America, Inc.8
- Geological Survey (U.S.)7
- National Atlas of the United States7
- Esri6
- GfK MACON6
- United States. Bureau of Transportation Statistics6
- ESRI4
- Economic and Social Research Institute (Reston, Va.)4
- Tele Atlas (Firm : U.S.)2
- Waterborne Commerce Statistics Center (U.S.)2
- Global Resource Information Database1