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- Annual report [elektronický zdroj] / National Road Transport Commission. . Melbourne, Vic. : The Commission, 1993- . v.
- Highway statistics [elektronický zdroj] / Public Roads Administration, Federal Works Agency. . Washington : Public Roads Administration, Federal Works Agency, 1947- . v.
- National transportation statistics [elektronický zdroj] / prepared by Research and Special Programs Administration, Transportation Systems Center, Transportation Information Division, Statistical Information Reporting Branch. . Cambridge, Mass. : [Washington, D.C. : Statistical Information Reporting Branch ; For sale by the Supt. of Docs., U.S. G.P.O., . v.