Columbia subject headings:
Bettmann, Otto--Photograph collections.
Corbis Corporation--Catalogs.
History, Modern--20th century--Pictorial works.
Photojournalism--History--20th century.
Twentieth century--Pictorial works.
Harvard subject headings:
Bettmann, Otto--Photograph collections--Catalogs.
History, Modern--20th century--Pictorial works
Photographs--Catalogs
Photojournalism--History--20th century.
Twentieth century--Pictorial works
Princeton subject headings:
Bettmann, Otto--Photograph collections--Catalogs.
Catalogs.
History, Modern--20th century--Pictorial works.
Photographs--Catalogs.
Photojournalism--History--20th century.
Twentieth century--Pictorial works.