Columbia subject headings:
Merchants--Italy--Venice--Correspondence.
Postal service--Italy--Venice--History.
Venice (Italy)--Records and correspondence.
Venice (Italy)--Relations--Turkey.
Harvard subject headings:
Merchants--Italy--Venice--Correspondence--History.
Postal service--Italy--Venice--History.
Venice (Italy)--Records and correspondence--History.
Princeton subject headings:
Merchants--Italy--Venice--Correspondence--History.
Postal service--Italy--Venice--History.
Venice (Italy)--Records and correspondence--History.