Columbia subject headings:
Catholic Church. Archdiocese of Cologne (Germany)
Cologne (Germany)--Church history.
Cologne Region (Germany)--Church history.
Harvard subject headings:
Catholic Church. Archdiocese of Cologne (Germany)--History.
Cologne Region (Germany)--Church history.
Princeton subject headings:
Catholic Church. Archdiocese of Cologne (Germany)--History.
Cologne Region (Germany)--Church history.