Columbia subject headings:
Art--Collectors and collecting--Italy--History--Congresses.
Collectors and collecting--Italy--History--Congresses.
Italy--History, Local--Congresses.
Harvard subject headings:
Art--Collectors and collecting--Italy--History--Congresses.
Collectors and collecting--Italy--History--Congresses.
Italy--History, Local--Congresses.
Princeton subject headings:
Art--Collectors and collecting--Italy--History--Congresses.
Collectors and collecting--Italy--History--Congresses.
Italy--History, Local--Congresses.