Columbia subject headings:
Art, American--20th century--Exhibitions.
Art, American--Exhibitions.
Art--Private collections--United States--Exhibitions.
Avant-garde (Aesthetics)--United States--History--20th century--Exhibitions.
Sonnabend, Ileana--Art collections--Exhibitions.
Sonnabend, Michael--Art collections--Exhibitions.
Harvard subject headings:
Princeton subject headings:
Art, American--20th century--Exhibitions.
Art, American--Exhibitions.
Sonnabend, Ileana--Art collections--Exhibitions.
Sonnabend, Michael--Art collections--Exhibitions.