Columbia subject headings:
Libraries--Germany--Cologne--History.
Public libraries--Germany (West)--History.
Stadtbücherei Köln--History.
Harvard subject headings:
Libraries--Germany--Cologne--History.
Public libraries--Germany (West)--History.
Public libraries--Germany--History.
Stadtbücherei Köln--History.
Princeton subject headings:
Public libraries--Germany--Cologne--History.
Stadtbücherei Köln--History.