Columbia subject headings:
Harvard subject headings:
Demonstrations--Germany--Erfurt--History--Sources.
Erfurt (Germany)--Politics and government--Sources.
Germany (East)--Politics and government--1989-1990--Sources.
Princeton subject headings:
Demonstrations--Germany--Erfurt--History--Sources.
Erfurt (Germany)--Politics and government.
Germany (East)--Politics and government--1989-1990--Sources.