00000cam a2200000ua 4500 UP-99796217610504991 Buklod 20121001110822.0 m |q d | ta 821020s1953 dcu r |000 0|eng d (iLib)UPD-00191507081 DLC CarP DLC NCTS LIBRARY National Research Council (U.S.). Highway Research Board. Traffic research problem statements presented at the 31st annual meeting, January 14-18, 1952. Washington, D.C. Highway Research Board 1952. 33 p. 25 cm. National Research Council. Publication 215 Traffic regulations Congresses. Highway Research Board Special Report 3 UPD NCTS Book