Columbia subject headings:
Harvard subject headings:
Civil society--Europe, Eastern--History--Congresses.
Europe, Eastern--Intellectual life--20th century--Congresses.
Europe, Eastern--Politics and government--1945-1989--Congresses.
Germany (East)--Politics and government--Congresses.
Opposition (Political science)--Europe, Eastern--History--Congresses.
Opposition (Political science)--Germany (East)--Congresses.
Princeton subject headings:
Germany (East)--Politics and government--Congresses.
Opposition (Political science)--Germany (East)--Congresses.