Columbia subject headings:
Art, German--Germany--Rhineland--20th century--Exhibitions.
Art, German--Germany--Rhineland--Exhibitions.
Photography--Germany--Rhineland--History--20th century--Exhibitions.
Sander, August--Exhibitions.
Harvard subject headings:
Art, German--20th century--Rhineland--Exhibitions.
Art, German--Germany--Rhineland--20th century--Exhibitions.
Art, German--Germany--Rhineland--Exhibitions.
Photography, Artistic--Exhibitions
Photography--Germany--Rhineland--History--20th century--Exhibitions.
Sander, August--Exhibitions.
Princeton subject headings:
Art, German--Germany--Rhineland--20th century--Exhibitions.
Photography, Artistic--Exhibitions.
Sander, August--Exhibitions.