Columbia subject headings:
Mosaics, Carolingian--Italy--Milan.
Mosaics, Italian--Italy--Milan.
Sant'Ambrogio (Church : Milan, Italy)
Harvard subject headings:
Milan (Italy)--Buildings, structures, etc.--Conservation and restoration.
Mosaics, Carolingian--Conservation and restoration--Italy--Milan.
Mosaics--Conservation and restoration--Italy--Milan.
Sant'Ambrogio (Church : Milan, Italy)
Princeton subject headings:
Mosaics, Carolingian--Italy--Milan.
Mosaics, Italian--Italy--Milan.
Sant'Ambrogio (Church : Milan, Italy)