Columbia subject headings:
Germany--History--Unification, 1990.
Germany--Politics and government--1990---Directories.
Harvard subject headings:
Germany (East)--Politics and government--1989-1990.
Germany (West)--Politics and government--1982-1990.
Germany--History--Unification, 1990--Chronology.
Germany--History--Unification, 1990--Sources.
Opposition (Political science)--Germany (East)--History.
Princeton subject headings:
Germany (East)--Politics and government--1989-1990.
Germany (West)--Politics and government--1982-1990.
Germany--History--Unification, 1990--Chronology.
Germany--History--Unification, 1990--Sources.
Opposition (Political science)--Germany (East)--History.