Columbia subject headings:
Art patronage--Germany--Düsseldorf--History--20th century.
Art, German--Germany--Düsseldorf--20th century.
Avant-garde (Aesthetics)--Germany--Düsseldorf.
Sonderbund Westdeutscher Kunstfreunde und Künstler.
Harvard subject headings:
Art, Modern--19th century--Germany (West)--Düsseldorf.
Art, Modern--20th century--Germany (West)--Düsseldorf.
Art--Germany (West)--Düsseldorf.
Artists--Germany (West)--Düsseldorf--Biography.
Sonderbund Westdeutscher Kunstfreunde und Künstler.
Princeton subject headings:
Art, Modern--19th century--Germany (West)--Düsseldorf.
Art, Modern--20th century--Germany (West)--Düsseldorf.
Art--Germany (West)--Düsseldorf.
Artists--Germany (West)--Düsseldorf--Biography.
Sonderbund Westdeutscher Kunstfreunde und Künstler.