Columbia subject headings:
Communism--Europe, Central--History--20th century--Congresses.
Communism--Europe, Eastern--History--20th century--Congresses.
Europe, Central--Politics and government--20th century--Congresses.
Europe, Eastern--Politics and government--1945---Congresses.
Harvard subject headings:
Communism--Europe, Central--History--20th century--Congresses.
Communism--Europe, Eastern--History--20th century--Congresses.
Europe, Central--History--History--Autonomy and independence movements--Congresses.
Europe, Central--Politics and government--20th century--Congresses.
Europe, Eastern--History--History--Autonomy and independence movements--Congresses.
Europe, Eastern--Politics and government--1945---Congresses.
Princeton subject headings:
Communism--Europe, Central--History--20th century--Congresses.
Communism--Europe, Eastern--History--20th century--Congresses.
Europe, Central--Politics and government--20th century--Congresses.
Europe, Eastern--Politics and government--1945---Congresses.