Columbia subject headings:
Harvard subject headings:
History, Modern--20th century--Pictorial works
History, Modern--20th century--Pictorial works.
Photography--20th century.
Photography--History--20th century
Photojournalism
Photojournalism.
Princeton subject headings:
Civilization, Modern--20th century--Pictorial works.
History, Modern--20th century--Pictorial works.