Columbia subject headings:
Democratization--Europe, Eastern--Congresses.
Europe, Eastern--History--20th century--Congresses.
Europe, Eastern--Politics and government--20th century--Congresses.
Harvard subject headings:
Socialism and culture--Europe, Central--History--20th century--Congresses.
Socialism and culture--Europe, Eastern--History--20th century--Congresses.
Socialism--Europe, Central--History--20th century--Congresses.
Socialism--Europe, Eastern--History--20th century--Congresses.
Socialists--Europe, Central--History--20th century--Congresses.
Socialists--Europe, Eastern--History--20th century--Congresses.
Princeton subject headings:
Democratization--Europe, Eastern--Congresses.
Europe, Eastern--History--20th century--Congresses.
Europe, Eastern--Politics and government--20th century--Congresses.