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- 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
- TomTom North America, Inc.8
- National Atlas of the United States5
- Geological Survey (U.S.)4
- United States. Bureau of Transportation Statistics3
- Environmental Systems Research Institute (Redlands, Calif.)2
- Esri2
- United States. Bureau of the Census. Geography Division2
- Institute for Water Resources (U.S.). Navigation Data Center1
- National Atlas of the United States and the United States Geological Survey1