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