Columbia subject headings:
Architecture, Romanesque--Germany--Cologne.
Church architecture--Germany--Cologne.
Church decoration and ornament--Germany--Cologne.
Harvard subject headings:
Architecture, Romanesque--Germany--Cologne.
Christian art and symbolism--Germany--Cologne.
Church architecture--Germany--Cologne.
Church buildings--Germany--Cologne.
Church decoration and ornament--Germany--Cologne.
Princeton subject headings:
Architecture, Romanesque--Germany--Cologne.
Christian art and symbolism--Germany--Cologne--Medieval period, 500-1500.
Church architecture--Germany--Cologne.