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