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Author
- United States. Bureau of Transportation Statistics27
- Stackhouse, Cecil17
- Cao, Changyong10
- Earle, Carville10
- Heppen, John10
- Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology.10
- Otterstrom, Samuel10
- National Atlas of the United States9
- Geological Survey (U.S.)6
- United States. Bureau of the Census. Geography Division6
- Rawson, Peg1
- Strocko, Ed1
- United States. Federal Highway Administration1
- United States. Office of the Deputy Under Secretary of Defense (Installations and Environment)1