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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
- United States. Bureau of Transportation Statistics4
- United States. Department of Transportation. Research and Innovative Technology Administration2
- United States. Bureau of the Census.1
- United States. Bureau of the Census. Geography Division1
- United States. Federal Highway Administration.1
- United States. Federal Motor Carrier Safety Administration.1