Columbia subject headings:
Art museums--Germany--Cologne.
Art--Germany--Cologne.
Cologne (Germany)--Buildings, structures, etc.
Museum architecture--Germany--Cologne--History.
Museums--Germany--Cologne.
Harvard subject headings:
Art museums--Germany--Cologne--History.
Museum architecture--Germany--Cologne--History.
Museums--Germany--Cologne--History.
Princeton subject headings:
Art museums--Germany--Cologne.
Art--Germany--Cologne.
Cologne (Germany)--Buildings, structures, etc.
Museums--Germany--Cologne.