Creator
- United States. Bureau of Transportation Statistics6
- National Atlas of the United States4
- Geological Survey (U.S.)3
- Battelle Memorial Institute1
- Jessberger, Steven1
- John A. Volpe National Transportation Systems Center (U.S.)1
- Miller, David1
- Strocko, Ed1
- United States. Federal Highway Administration1
- United States. Federal Highway Administration. Office of Highway Policy Information1