Columbia subject headings:
Arches.
Architecture, Romanesque--Italy, Southern.
Mosaics--Italy--Campania.
Mosaics--Italy--Sicily.
Harvard subject headings:
Arches
Architecture, Romanesque--Italy, Southern.
Mosaics--Italy--Campania.
Mosaics--Italy--Sicily.
Princeton subject headings:
Arches.
Architecture, Romanesque--Italy, Southern.
Mosaics--Italy--Campania.
Mosaics--Italy--Sicily.