Columbia subject headings:
Harvard subject headings:
Cathedrals--Germany--Cologne.
Christian art and symbolism--Germany--Cologne.
Church decoration and ornament--Germany--Cologne.
Cologne (Germany)--Buildings, structures, etc.
Cologne (Germany)--Religion.
Festschriften.
Kölner Dom.
Princeton subject headings:
Cathedrals--Germany--Cologne.
Cologne (Germany)--Buildings, structures, etc.
Kölner Dom.
Theology--History--Middle Ages, 600-1500.