Columbia subject headings:
Authority--Congresses.
Motion pictures--Poland--Congresses.
Pictures--Congresses.
Signs and symbols--Congresses.
Social norms--Congresses.
Visual communication in art--Congresses.
Visual communication--Congresses.
Visual communication--Poland.
Harvard subject headings:
Authority--Congresses.
Motion pictures--Poland--Congresses.
Pictures--Congresses.
Signs and symbols--Congresses
Social norms--Congresses.
Visual communication in art--Congresses.
Visual communication--Congresses
Visual communication--Poland.
Princeton subject headings: