Columbia subject headings:
Photography--Germany--History--20th century.
Siemens Aktiengesellschaft--Art patronage.
Harvard subject headings:
Photographers--Germany--Exhibitions.
Photography, Artistic--Exhibitions
Photography--Germany--History--20th century--Exhibitions.
Siemens Fotoprojekt--Exhibitions.
Princeton subject headings:
Photographers--Germany--Exhibitions.
Photography, Artistic--Exhibitions.
Photography--Germany--History--20th century--Exhibitions.
Siemens Fotoprojekt--Exhibitions.