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Author/Creator
- United States. Bureau of the Census. Data User Services Division44
- United States. Bureau of Transportation Statistics12
- United States. Bureau of the Census. Geography Division8
- Shaw, David4
- United States. Bureau of the Census2
- United States. Environmental Protection Agency2
- United States. National Oceanic and Atmospheric Administration2
- Environmental Systems Research Institute (Redlands, Calif.)1
- Geological Survey (U.S.)1
- United States. Department of Commerce1
- World Resources Institute1