Columbia subject headings:
Harvard subject headings:
Berlin Wall, Berlin, Germany, 1961-1989
Germany--History--Unification, 1990.
Pacificsm.
Pacifism
Princeton subject headings:
Berlin Wall, Berlin, Germany, 1961-1989--Anniversaries, etc.--Congresses.
Berlin Wall, Berlin, Germany, 1961-1989--Congresses.
Germany--History--Unification, 1990--Congresses.