Columbia subject headings:
Harvard subject headings:
Authoritarianism--Europe--History--Congresses.
Authoritarianism--History.
Communism and mass media--Europe--History--20th century--Congresses.
Freedom of the press--Europe, Central--History--20th century--Congresses.
Freedom of the press--Europe, Central--History--20th century.
Freedom of the press--Europe, Eastern--History--20th century--Congresses.
Freedom of the press--Europe, Eastern--History--20th century.
Mass media--Political aspects--Europe, Central--History--20th century--Congresses.
Mass media--Political aspects--Europe, Eastern--History--20th century--Congresses.
Princeton subject headings:
Authoritarianism--History.
Freedom of the press--Europe, Central--History--20th century.
Freedom of the press--Europe, Eastern--History--20th century.