Columbia subject headings:
Art, Modern--20th century.
Avant-garde (Aesthetics)--History--20th century.
Postmodernism.
Harvard subject headings:
Art, Modern--19th century
Art, Modern--20th century
Modernism (Art)
Princeton subject headings:
Art, Modern--20th century.
Avant-garde (Aesthetics)--History--20th century.
Postmodernism.