Columbia subject headings:
Harvard subject headings:
German reunification question (1949-1990)
Germany (East)--History.
Germany--History--1945-1990.
Germany--History--Unification, 1990.
Revolutions--Germany (East)--History.
Revolutions--Germany--History--20th century.
Princeton subject headings:
Germany (East)--Politics and government--1989-1990.
Germany--History--Unification, 1990.