Traffic surveys by post cards.

Detalles Bibliográficos
Autor Corporativo:	National Research Council (U.S.). Highway Research Board
Formato:	Libro
Lenguaje:	inglés
Publicado:	Washington, D.C. Highway Research board, Division of Engineering and Industrial Research, National Research council 1951.
Colección:	Highway Research Board Bulletin 41.
Materias:	Origin and destination traffic surveys.