Describes system adopted in Washington, D. C.
Traffic control systems
Nat. Safety Council -- Proc.
National Safety Council -- Meeting ; 1925 Control
National Safety Council -- Proceedings ; p 38-43
1925
6 pages
Aufsatz (Konferenz)
Englisch
© Metadata Copyright Elsevier B. V. All rights reserved.
NTIS | 1979
Tema Archiv | 1985
|NTIS | 1973