Columbia subject headings:
Berlin (Germany)--History--1945-1990.
Berlin Wall, Berlin, Germany, 1961-1989.
World politics--1955-1965.
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Berlin Wall, Berlin, Germany, 1961-1989.
World politics--1955-1965
Princeton subject headings:
Berlin (Germany)--History--1945-1990.
Berlin Wall, Berlin, Germany, 1961-1989.
World politics--1955-1965.