Columbia subject headings:
Harvard subject headings:
Becher, Bernd, 1931-2007--Exhibitions.
Becher, Hilla--Exhibitions.
Coal mines and mining--Pennsylvania--Pictorial works.
Mine buildings--Pennsylvania--Pictorial works.
Mine buildings--Pictorial works.
Mine hoisting--Pennsylvania--Pictorial works.
Photography, Artistic.
Photography, Industrial--Pennsylvania.
Tipples--Pennsylvania--Pictorial works--Exhibitions.
Tipples--Pennsylvania--Pictorial works.
Princeton subject headings:
Becher, Bernd, 1931-2007.
Becher, Hilla.
Coal mines and mining--Pennsylvania--Pictorial works.
Documentary photography--Exhibitions.