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Publisher
- University of Nebraska--Lincoln6
- National Atlas of the United States4
- United States. Bureau of Transportation Statistics3
- Commonwealth Business Media2
- Amtrak1
- Cartography Associates1
- Environmental Systems Research Institute (Redlands, Calif.)1
- Federal Railroad Administration (FRA)1
- Geological Survey (U.S.)1
- National Energy Information Center (U.S.)1
- Rand McNally,1
- The U.S. Geological Survey,1