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Cutting the Traffic Knot

Universal Portland Cement Co. , [1927]

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

[s.n.], 1930

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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

National Conference on Street and Highway Safety, 1930

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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

[s.n.], 1930

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The Holland Tunnel : toll rates : traffic regulations : description of tunnel

New York State Bridge & Tunnel Commission and New Jersey Interstate Bridge & Tunnel Commission , 1928

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

s.n.], 1929

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

[s.n.], 1930

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

[s.n.], 1930