Columbia subject headings:
Motion picture audiences--Attitudes--Congresses.
Motion pictures--Social aspects--Congresses.
Harvard subject headings:
Motion pictures--Appreciation--Germany--Congresses.
Motion pictures--History--20th century--Congresses.
Theater--History--20th century--Congresses.
Princeton subject headings:
Motion picture audiences--Attitudes--Congresses.
Motion pictures--Social aspects--Congresses.