Columbia subject headings:
Mosaics, Byzantine--Italy--Ravenna.
Mosaics, Early Christian--Italy--Ravenna.
Mosaics--Italy--Ravenna.
Harvard subject headings:
Mosaics, Byzantine--Italy--Ravenna.
Ravenna (Italy)--Tours.
Princeton subject headings:
Mosaics, Byzantine--Italy--Ravenna.
Mosaics, Early Christian--Italy--Ravenna.
Mosaics--Italy--Ravenna.