Columbia subject headings:
Friedlander, Lee.
Photography, Artistic.
Photography, Industrial.
Harvard subject headings:
Friedlander, Lee
Industries--Ohio--Pictorial works.
Industries--Pennsylvania--Pictorial works.
Photography, Artistic.
Working class--Pictorial works.
Princeton subject headings:
Industries--Ohio--Pictorial works.
Industries--Pennsylvania--Pictorial works.
Photography, Artistic.
Working class--Pictorial works.