Columbia subject headings:
Harvard subject headings:
Traffic engineering--Germany (East)--History.
Traffic safety--Germany (East)--History.
Transportation and state--Germany (East)--History.
Transportation, Automotive--Germany (East)--History.
Transportation--Germany (East)--Planning--History.
Princeton subject headings:
Automobiles--Germany (East)--Safety measures.
Traffic regulations--Germany (East)
Transportation and state--Germany (East).