Columbia subject headings:
Becher, Bernd, 1931-2007--Exhibitions.
Becher, Hilla--Exhibitions.
Mine buildings--Pictorial works.
Mine hoisting--Pictorial works.
Photography, Industrial--Exhibitions.
Harvard subject headings:
Becher, Bernd, 1931-2007--Exhibitions.
Becher, Hilla--Exhibitions.
Mine buildings--Pictorial works--Exhibitions.
Mining machinery--Pictorial works--Exhibitions.
Princeton subject headings: