Columbia subject headings:
Germany (East)--History--Congresses.
Germany--History--Unification, 1990--Congresses.
Harvard subject headings:
Germany (East)--Politics and government--1989-1990--Congresses.
Germany--History--Unification, 1990--Congresses.
Princeton subject headings:
Germany (East)--Politics and government--1989-1990--Congresses.