Creator
- Geological Survey (U.S.)5
- United States. Bureau of Transportation Statistics5
- National Atlas of the United States4
- Institute for Water Resources (U.S.). Navigation Data Center2
- United States. Bureau of the Census. Geography Division2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Waterborne Commerce Statistics Center (U.S.)2
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Rawson, Peg1