National transportation statistics /
prepared by Research and Special Programs Administration, Transportation Systems Center, Transportation Information Division, Statistical Information Reporting Branch.
United States. Bureau of Transportation Statistics., John A. Volpe National Transportation Systems Center (U.S.)., Transportation Systems Center., United States. Dept. of Transportation. Research and Special Programs Administration., Center for Transportation Information (U.S.)., Transportation Systems Center. Information Management Branch., Transportation Systems Center. Statistical Information Reporting Branch. National transportation statistics. Cambridge, Mass.: The Branch .
Transportation Systems Center. Statistical Information Reporting Branch, et al.. National Transportation Statistics. Cambridge, Mass.: The Branch ,
Warning: These citations may not always be complete (especially for serials).