Creator
- Geological Survey (U.S.)6
- United States. Bureau of Transportation Statistics5
- Gap Analysis Program (U.S.)2
- National Atlas of the United States2
- United States. Bureau of the Census. Geography Division2
- Environmental Systems Research Institute (Redlands, Calif.)1
- Rawson, Peg1
- Strocko, Ed1
- U.S. Census Bureau. Geography Division1
- United States. Bureau of Transportation Statisticsf1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1