Columbia subject headings:
Art, Abstract--Exhibitions.
Art, Modern--20th century--Exhibitions.
Art--Private collections--Germany--Mönchengladbach--Exhibitions.
Etzold, Hans Joachim, -1976--Art collections--Exhibitions.
Harvard subject headings:
Art, Abstract--Exhibitions
Art, Modern--20th century--Exhibitions
Etzold, Hans Joachim, -1976--Art collections--Exhibitions.
Städtisches Museum Abteiberg Mönchengladbach (Germany)--Exhibitions.
Princeton subject headings:
Art, Abstract--Exhibitions.
Art, Modern--20th century--Exhibitions.
Art--Private collections--Germany--Mönchengladbach--Exhibitions.
Etzold, Hans Joachim, -1976--Art collections--Exhibitions.