Columbia subject headings:
Commerce--History--Medieval, 500-1500.
Venice (Italy)--Economic conditions.
Venice (Italy)--History--697-1508.
Harvard subject headings:
Commerce--History--Medieval, 500-1500
Venice (Italy)--Commerce--History.
Venice (Italy)--History--697-1508.
Princeton subject headings:
Commerce--History--Medieval, 500-1500.
Venice (Italy)--Economic conditions.
Venice (Italy)--History--697-1508.