Columbia subject headings:
Architecture--Conservation and restoration--Italy--Congresses.
Architecture--Italy--History--20th century--Congresses.
Harvard subject headings:
Architecture--Conservation and restoration--Italy--Congresses.
Architecture--Italy--20th century--Congresses.
Princeton subject headings:
Architecture--Conservation and restoration--Italy--Congresses.
Architecture--Italy--20th century--Conservation and restoration--Congresses.