Creator
- United States. National Oceanic and Atmospheric Administration6
- United States. Bureau of Transportation Statistics3
- Waterborne Commerce Statistics Center (U.S.)3
- Institute for Water Resources (U.S.). Navigation Data Center2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Coastal Services Center (U.S.)1
- United States. Bureau of Transportation Statisticsf1
- United States. Department of Commerce1
- United States. National Ocean Service1