Columbia subject headings:
Europe--Politics and government--20th century--Congresses.
Totalitarianism--Congresses.
Harvard subject headings:
Communism--Europe--History--Congresses.
Communism--Europe--History--History--20th century--Congresses.
Europe--Politics and government--20th century--Congresses.
Fascism--Europe--History--20th century
Nationalism--Europe--History--20th century--Congresses.
Totalitarianism--History--20th century--Congresses.
Princeton subject headings: