Columbia subject headings:
Berlin (Germany)--History--1945-1990.
Berlin (Germany)--Politics and government--1945-1990.
Berlin Wall, Berlin, Germany, 1961-1989.
Germany (East)--Foreign relations--Germany (West)
Germany (West)--Foreign relations--Germany (East)
Harvard subject headings:
Berlin (Germany)--History--1945-1990
Berlin (Germany)--Politics and government--1945-1990
Berlin Wall, Berlin, Germany, 1961-1989.
Germany (East)--Foreign relations--Germany (West)
Germany (West)--Foreign relations--Germany (East)
Princeton subject headings:
Berlin (Germany)--History--1945-1990.
Berlin (Germany)--Politics and government--1945-1990.
Berlin Wall, Berlin, Germany, 1961-1989.
Germany (East)--Foreign relations--Germany (West)
Germany (West)--Foreign relations--Germany (East)