Columbia subject headings:
Art, Abstract--Germany--Exhibitions.
Art, Modern--21st century--Exhibitions.
Constructivism (Art)--Germany--Exhibitions.
Harvard subject headings:
Art, Abstract--Germany--Exhibitions
Art, Modern--21st century--Exhibitions
Constructionism (Art)--Germany--Exhibitions.
Princeton subject headings:
Art, Abstract--Germany--Exhibitions.
Art, Modern--21st century--Exhibitions.
Constructionism (Art)--Germany--Exhibitions.