Columbia subject headings:
Altarpieces, Gothic--Conservation and restoration--Italy--Piacenza.
Altarpieces, Italian--Conservation and restoration--Italy--Piacenza.
Cattedrale di Piacenza.
Harvard subject headings:
Altarpieces, Gothic--Italy--Piacenza--Conservation and restoration.
Altarpieces, Italian--Italy--Piacenza--Conservation and restoration.
Cattedrale di Piacenza.
Church decoration and ornament--Italy--Piacenza--Conservation and restoration.
Princeton subject headings:
Altarpieces, Gothic--Conservation and restoration--Italy--Piacenza.
Altarpieces, Italian--Conservation and restoration--Italy--Piacenza.
Cattedrale di Piacenza.