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