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