Columbia subject headings:
Photography, Artistic.
Photography--Germany--History--20th century--Exhibitions.
Von der Heydt-Museum--Exhibitions.
Harvard subject headings:
Photograph collections--Germany--Wuppertal--Exhibitions.
Photography, Artistic--Exhibitions
Photography--Germany--History--20th century--Exhibitions.
Von der Heydt-Museum--Exhibitions.
Princeton subject headings: