Columbia subject headings:
Aachener Dom.
Christian art and symbolism--Germany--Aachen--Medieval, 500-1500.
Harvard subject headings:
Aachen (Germany)--Buildings, structures, etc.
Aachener Dom.
Christian art and symbolism--Medieval, 500-1500--Germany--Aachen.
Church decoration and ornament--Germany--Aachen.
Princeton subject headings:
Aachener Dom.
Christian art and symbolism--Medieval, 500-1500--Germany (West)--Aachen.