Columbia subject headings:
Harvard subject headings:
Architecture, Romanesque--Germany--Cologne--Periodicals.
Church architecture--Germany--Cologne--Periodicals.
Church buildings--Germany--Cologne--Periodicals.
Cologne (Germany)--Buildings, structures, etc.--Periodicals.
Princeton subject headings:
Architecture, Romanesque--Germany--Cologne--Periodicals.
Church architecture--Germany--Cologne--Periodicals.
Church buildings--Germany--Cologne--Periodicals.
Cologne (Germany)--Buildings, structures, etc.--Periodicals.