Columbia subject headings:
Harvard subject headings:
Express highways--Europe--History--20th century.
Express highways--Germany--Design and construction--History--20th century.
Express highways--Germany--History--20th century.
National monuments--Germany.
National socialism and architecture.
Transportation and state--Germany--History--20th century.
Transportation engineering--Germany--History--20th century.
Princeton subject headings:
Express highways--Europe--History--20th century.
Express highways--Germany--Design and construction--History--20th century.
Express highways--Germany--History--20th century.
National monuments--Germany.
National socialism and architecture.
Transportation and state--Germany--History--20th century.
Transportation engineering--Germany--History--20th century.