Creator
- Geological Survey (U.S.)4
- United States. Bureau of Transportation Statistics4
- National Atlas of the United States3
- Canada Centre for Remote Sensing2
- Environmental Systems Research Institute (Redlands, Calif.)2
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)2
- United States. Bureau of the Census. Geography Division2
- Vanderbilt Engineering Center for Transportation Operations and Research2
- Waterborne Commerce Statistics Center (U.S.)2
- Center for Spatial and Textual Analysis1
- Institute for Water Resources (U.S.). Navigation Data Center1
- Kelso, Nathaniel Vaughn1
- Patterson, Tom1