Columbia subject headings:
Harvard subject headings:
Bankers--Italy--Pisa--History.
Bankers--Italy--Sicily--History.
Merchants--Italy--Pisa--History.
Merchants--Italy--Sicily--History.
Sicily (Italy)--Commerce--History.
Princeton subject headings:
Bankers--Italy--Pisa--History.
Bankers--Italy--Sicily--History.
Merchants--Italy--Pisa--History.
Merchants--Italy--Sicily--History.
Sicily (Italy)--Commerce--History.