Columbia subject headings:
Cologne (Germany)--History.
Güttsches, Arnold, 1904-
Rhineland (Germany)--History.
Harvard subject headings:
Cologne (Germany)--History.
Güttsches, Arnold, 1904-
Rhineland (Germany)--History.
Princeton subject headings:
Cologne (Germany)--History.
Güttsches, Arnold, 1904-
Rhineland (Germany)--History.