Traffic safety, a national problem a symposium

Bibliográfalaš dieđut
Searvvušdahkkit: National Academy of Engineering, Eno Foundation for Highway Traffic Control
Materiálatiipa: Girji
Giella:eaŋgalasgiella
Almmustuhtton: Saugatuck, Conn. Eno Foundation for Highway Traffic Control 1967.
Fáttát: