Columbia subject headings:
Harvard subject headings:
Art--Philosophy--20th century--Congresses.
Avant-garde (Aesthetics)--20th century--Congresses.
Postmodernism--20th century--Congresses.
Princeton subject headings:
Art, Modern--20th century--Congresses.
Avant-garde (Aesthetics)--Congresses.
Postmodernism--Congresses.