Columbia subject headings:
Archives--Italy--Naples--History.
Archives--Italy--Sardinia--History.
Archives--Italy--Sicily--History.
Harvard subject headings:
Archives--Italy--Naples (Kingdom)--History.
Archives--Italy--Sardinia--History.
Archives--Italy--Sicily--History.
Princeton subject headings:
Archives--Italy--Naples--History.
Archives--Italy--Sardinia--History.
Archives--Italy--Sicily--History.