Columbia subject headings:
Art, Abstract--Exhibitions.
Calder, Alexander, 1898-1976--Exhibitions.
Trees in art--Exhibitions.
Harvard subject headings:
Art, Abstract--Exhibitions
Calder, Alexander, 1898-1976--Exhibitions.
Trees in art--Exhibitions.
Princeton subject headings:
Calder, Alexander, 1898-1976--Exhibitions.
Outdoor sculpture.