Creator
- Environmental Systems Research Institute (Redlands, Calif.)10
- Geological Survey (U.S.)9
- United States. Bureau of Transportation Statistics6
- United States. Department of Housing and Urban Development5
- Gap Analysis Program (U.S.)3
- National Atlas of the United States2
- United States. Bureau of the Census. Geography Division2
- Firestine, Theresa1
- Hudgins, Andrew1
- Institute for Water Resources (U.S.). Navigation Data Center1
- National Energy Information Center (U.S.)1
- Rawson, Peg1
- Strocko, Ed1
- U.S. Census Bureau. Geography Division1
- United States Geological Survey1
- United States. Bureau of Transportation Statisticsf1
- United States. Federal Transit Administration1
- Waterborne Commerce Statistics Center (U.S.)1