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  1. 1

    Manual on street traffic signs, signals and markings : as prepared by American Engineering Council : for the National Conference on Street and Highway Safety in 1928-1929

    Published 1930
    Book
    Manual on street traffic signs, signals and markings : as prepared by American Engineering Council : for the National Conference on Street and Highway Safety in 1928-1929
  2. 2

    Report of the Committee of American Engineering Council on street traffic signs, signals, and markings

    Published 1929
    Book
    Report of the Committee of American Engineering Council on street traffic signs, signals, and markings
  3. 3

    Educació viària by Cornellà de Llobregat. Ajuntament. Guàrdia Urbana

    Published 1992
    Book
    Educació viària

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