Columbia subject headings:
Drawing--Collectors and collecting--Italy--Congresses.
Drawing--Conservation and restoration--Congresses.
Prints--Collectors and collecting--Italy--Congresses.
Prints--Conservation and restoration--Congresses.
Harvard subject headings:
Art--Conservation and restoration--Congresses.
Drawing, Italian--Congresses.
Prints, Italian--Congresses.
Princeton subject headings:
Drawing--Collectors and collecting--Italy--Congresses.
Drawing--Conservation and restoration--Congresses.
Prints--Collectors and collecting--Italy--Congresses.
Prints--Conservation and restoration--Congresses.