Columbia subject headings:
Art, Soviet--Exhibitions.
Art--Private collections--Germany (West)--Exhibitions.
Ludwig, Irene--Art collections--Exhibitions.
Ludwig, Peter, 1925-1996--Art collections--Exhibitions.
Harvard subject headings:
Art, Modern--20th century--Soviet Union--Exhibitions.
Art, Soviet--Exhibitions.
Artists--Soviet Union--Biography.
Ludwig, Peter, 1925-1996--Art collections--Exhibitions.
Princeton subject headings:
Art, Modern--20th century--Soviet Union--Exhibitions.
Art, Soviet--Exhibitions.
Art--Private collections--Germany (West)--Exhibitions.
Ludwig, Irene--Art collections--Exhibitions.
Ludwig, Peter, 1925-1996--Art collections--Exhibitions.