Columbia subject headings:
Harvard subject headings:
Art--Private collections--Germany--Berlin--Exhibitions.
Böckmann, Georg--Art collections--Exhibitions.
Böckmann, Georg--Art collections.
Böckmann, Ingrid--Art collections--Exhibitions.
Böckmann, Ingrid--Art collections.
Painting--Private collections--Germany--Berlin--Exhibitions.
Richter, Gerhard, 1932---Exhibitions.
Princeton subject headings:
Böckmann, Georg--Art collections--Exhibitions.
Böckmann, Ingrid--Art collections--Exhibitions.
Painting--Private collections--Germany--Berlin--Exhibitions.
Richter, Gerhard, 1932---Exhibitions.