Creator
- Geological Survey (U.S.)6
- National Atlas of the United States5
- United States. Bureau of Transportation Statistics3
- Environmental Systems Research Institute (Redlands, Calif.)2
- United States. Bureau of the Census. Geography Division2
- Institute for Water Resources (U.S.). Navigation Data Center1
- Rawson, Peg1
- Ritters, Kurt1
- United States. Forest Service1