Columbia subject headings:
Harvard subject headings:
Berlin Wall, Berlin, Germany, 1961-1989--Exhibitions.
Germany--History--1945-1990--Exhibitions.
Germany--History--Unification, 1990--Exhibitions.
Princeton subject headings:
Germany (East)--Politics and government--1989-1990--Exhibitions.
Germany--History--Unification, 1990--Anniversaries, etc.--Exhibitions.
Protest movements--Germany (East)--History--Exhibitions.