Columbia subject headings:
Art, Modern--20th century--Exhibitions.
Nature in art--Exhibitions.
Plants in art--Exhibitions.
Harvard subject headings:
Art, German--20th century--Exhibitions.
Art, German--Germany--20th century--Exhibitions.
Plants in art--Exhibitions
Princeton subject headings:
Art, Modern--20th century--Exhibitions.
Beuys, Joseph.
Kirkeby, Per.
Klee, Paul, 1879-1940.
Marc, Franz, 1880-1916.
Nature in art--Exhibitions.
Plants in art--Exhibitions.
Winter, Fritz, 1905-1976.