Columbia subject headings:
Art, American--20th century--Exhibitions.
Art, American--Exhibitions.
Art, European--20th century--Exhibitions.
Art, European--Exhibitions.
Art--Private collections--Pennsylvania--Philadelphia--Exhibitions.
Harvard subject headings:
Art, American--20th century--Exhibitions
Art, American--Exhibitions
Art, European--20th century--Exhibitions
Art, European--Exhibitions
Art, Modern--20th century--Europe--Exhibitions.
Art, Modern--20th century--United States--Exhibitions.
Art--Private collections--Pennsylvania--Philadelphia--Exhibitions.
Princeton subject headings:
Art--Private collections--Pennsylvania--Philadelphia--Exhibitions.