Columbia subject headings:
Art and photography--History--19th century.
Art and photography--History--20th century.
Painting, Modern--History--20th century.
Photography--History--20th century.
Harvard subject headings:
Art and photography--History--19th century.
Art and photography--History--20th century.
Painting, Modern--20th century--History
Photography--History--20th century
Princeton subject headings:
Art and photography--History--19th century.
Art and photography--History--20th century.
Painting, Modern--20th century--History.
Photography--History--20th century.