Columbia subject headings:
Photography, Artistic--Exhibitions.
Photography--Germany--Exhibitions.
Portrait photography--Exhibitions.
Harvard subject headings:
Photography, Artistic--Exhibitions
Photography--Germany--Exhibitions
Photography--Germany--History--20th century--Exhibtions.
Portrait photography--Exhibitions
Portrait photography--Germany--History--20th century--Exhibitions.
Princeton subject headings:
Photography, Artistic--Exhibitions.
Photography--Germany--Exhibitions.
Portrait photography--Exhibitions.