Columbia subject headings:
Harvard subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Europe--Boundaries--Hungary--History.
Germany--Boundaries--Hungary--History.
Hungary--Boundaries--Europe--History.
Hungary--Boundaries--Germany--History.
Hungary--History--1989-
Hungary--Politics and government--1989-
Princeton subject headings:
Berlin Wall, Berlin, Germany, 1961-1989.
Europe, Eastern--History--1945-1989.
Hungary--History--1945-1989.
Hungary--History--1989-