Columbia subject headings:
Harvard subject headings:
Cities and towns--Germany--History--20th century.
Dortmund (Germany)--History--20th century.
Dresden (Germany)--History--20th century.
Freiburg im Breisgau (Germany)--History--20th century.
Princeton subject headings:
Cities and towns--Germany.
Dortmund (Germany)--History--20th century.
Dresden (Germany)--History--20th century.
Freiburg im Breisgau (Germany)--History--20th century.