Columbia subject headings:
DEFA--History--Congresses.
Motion picture industry--Germany (East)--History--Congresses.
Motion pictures--Germany (East)--History--Congresses.
Harvard subject headings:
DEFA--History--Congresses.
Motion picture industry--Germany (East)--History--Congresses.
Motion pictures--Germany (East)--History--Congresses.
Princeton subject headings: