Columbia subject headings:
Art, German--Private collections--Germany--Cologne--Exhibitions.
Ludwig, Irene--Art collections.
Ludwig, Peter, 1925-1996--Art collections.
Harvard subject headings:
Art, Modern--20th century--Exhibitions
Art, Modern--Private collections--Germany--Cologne--Exhibitions.
Human beings in art--Exhibitions
Ludwig, Irene--Art collections--Exhibitions.
Ludwig, Peter, 1925-1996--Art collections--Exhibitions.
Princeton subject headings:
Art, Modern--20th century.
Human figure in art.