Columbia subject headings:
Harvard subject headings:
Aktion (Berlin, Germany)--Exhibitions.
Art, European--Exhibitions
Art, Modern--20th century--Europe--Exhibitions.
Art--Private collections--Germany (West)--Bad Godesberg (Bonn)--Exhibitions.
Expressionism (Art)--Exhibitions
Hirche, Kurt--Art collections--Exhibitions.
Princeton subject headings:
Aktion (Berlin, Germany)--Exhibitions.
Art, Modern--20th century--Exhibitions.
Art--Private collections--Germany (West)--Bad Godesberg (Bonn)--Exhibitions.
Expressionism (Art)--Exhibitions.
Hirche, Kurt--Art collections--Exhibitions.