Columbia subject headings:
Istituto superiore per la conservazione ed il restauro (Italy)
Mosaics, Medieval--Italy--Rome.
Mosaics--Conservation and restoration--Italy--Rome.
Harvard subject headings:
Christian art and symbolism--Italy--Rome--Medieval, 500-1500.
Church decoration and ornament--Italy--Rome.
Mosaics, Italian--Conservation and restoration--Italy--Rome.
Mosaics, Medieval--Conservation and restoration--Italy--Rome.
Princeton subject headings:
Istituto superiore per la conservazione ed il restaturo (Italy)
Mosaics, Medieval--Italy--Rome.
Mosaics--Conservation and restoration--Italy--Rome.