Author/Creator
- United States. Federal Highway Administration✖[remove]1,645
- United States82
- Geological Survey (U.S.)69
- United States. Federal Transit Administration51
- American Association of State Highway and Transportation Officials49
- United States. Urban Mass Transportation Administration44
- National Cooperative Highway Research Program41
- National Research Council (U.S.). Transportation Research Board37
- Turner-Fairbank Highway Research Center36
- Geological Survey (U.S.), issuing body33
- Forest Products Laboratory (U.S.)29
- United States. National Highway Traffic Safety Administration27
- National Bicycling and Walking Study (U.S.)19
- National Wood in Transportation Information Center (U.S.)19
- American Association of State Highway Officials18
- United States. Department of Transportation18
- Comsis Corporation17
- Ohio. Dept. of Transportation17
- Florida. Department of Transportation14
- Texas Transportation Institute14