National Conference on Street and Highway Safety : report of the ... : appointed by the Secretary of Commerce

National Conference on Street and Highway Safety : act ...

Model municipal traffic ordinance : as prepared for the National Conference on Street and Highway Safety in 1928 ...

Ways and means to traffic safety : recommendations of National Conference on Street and Highway Safety, including findings of all Conference Committees and of General Meetings of Conference Held in 1924, 1926 amd 1930, as summarized and approved by Third National Conference, May 27-28-29, 1930

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