Columbia subject headings:
Harvard subject headings:
Art libraries--Germany--Cologne--History.
Kunst- und Museumsbibliothek der Stadt Köln--History.
Museum archives--Germany--Cologne.
Museum libraries--Germany--Cologne.
Princeton subject headings:
Kunst- und Museumsbibliothek der Stadt Köln--History.
Museum archives--Germany--Köln.
Museum libraries--Germany--Köln.