Columbia subject headings:
Art--Germany--Cologne--20th century--Exhibitions.
Cologne (Germany)--20th century--Pictorial works--Exhibitions.
Harvard subject headings:
Art, German--Germany--Cologne--Exhibitions.
Cologne (Germany)--History--Exhibitions.
Kölnisches Stadtmuseum--Exhibitions.
Princeton subject headings:
Art--Germany--Cologne--20th century--Exhibitions.
Cologne (Germany)--20th century--Pictorial works--Exhibitions.