Columbia subject headings:
Becher, Bernd, 1931-2007--Exhibitions.
Becher, Hilla--Exhibitions.
Photography, Artistic--Exhibitions.
Sculpture, Modern--20th century--Exhibitions.
Smithson, Robert--Exhibitions.
Harvard subject headings:
Becher, Bernd, 1931-2007--Exhibitions.
Becher, Hilla--Exhibitions.
Industrial buildings--Pictorial works.
Photography, Industrial--Exhibitions.
Smithson, Robert--Exhibitions.
Princeton subject headings:
Becher, Bernd, 1931-2007--Exhibitions.
Becher, Hilla--Exhibitions.
Industrial buildings--Pictorial works.
Photography, Industrial--Exhibitions.
Smithson, Robert--Exhibitions.