Creator
- United States. Bureau of Transportation Statistics5
- National Atlas of the United States4
- Environmental Systems Research Institute (Redlands, Calif.)3
- Geological Survey (U.S.)3
- Institute for Water Resources (U.S.). Navigation Data Center1
- Rawson, Peg1
- U.S. Census Bureau. Geography Division1
- United States. Bureau of Transportation Statisticsf1
- United States. Federal Aviation Administration1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1