International transportation topics 4 reports ; sign uniformity, closing the Darien gap, transportation in Europe, and transportation in Great Britain.

Xehetasun bibliografikoak
Egile korporatiboa:	National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, National Research Council (U.S.). Highway Research Board. Special Committee on International Cooperative Activities
Formatua:	Liburua
Hizkuntza:	English
Argitaratua:	Washington Highway Research Board D.C., 1969.
Saila:	Highway research record no. 299.
Gaiak:	Traffic signs and signals > International cooperation. Transportation > Europe. Urban transportation policy > Great Britain. Transportation > International cooperation.