Creator
- United States. Bureau of Transportation Statistics6
- Gap Analysis Program (U.S.)3
- National Atlas of the United States2
- United States. Bureau of the Census. Geography Division2
- Firestine, Theresa1
- Geological Survey (U.S.)1
- Hudgins, Andrew1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Rawson, Peg1
- Strocko, Ed1
- United States. Bureau of Transportation Statisticsf1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1