Columbia subject headings:
Architecture, Medieval--Europe--Congresses.
Cathedrals--Europe--Congresses.
Church architecture--Europe--Congresses.
Church decoration and ornament--Europe--Congresses.
Harvard subject headings:
Architecture, Medieval--Europe--Congresses.
Art, Bizantyne--Mediterranean Region--Congresses.
Art, Medieval--Congresses
Cathedrals--Europe--History--Congresses.
Princeton subject headings:
Architecture, Medieval--Europe--Congresses.
Art, Bizantyne--Mediterranean Region--Congresses.
Art, Medieval--Congresses.
Cathedrals--Europe--History--Congresses.