Columbia subject headings:
Florence (Italy)--Commerce--History.
Harvard subject headings:
Commerce--History--Medieval, 500-1500
Florence (Italy)--Commerce--History--To 1500.
Florence (Italy)--Commerce--History.
Florence (Italy)--History--To 1421
Merchants--Italy--Florence--History--14th century.
Princeton subject headings:
Florence (Italy)--Commerce--History.
Florence (Italy)--Economic conditions.
Florence (Italy)--History--To 1421.