Columbia subject headings:
Commerce--History--Medieval, 500-1500.
Communication and traffic--Europe--History.
Europe--History--476-1492.
Europe--Social conditions--To 1492.
Social history--Medieval, 500-1500.
Harvard subject headings:
Commerce--History--Medieval, 500-1500
Europe, Northern--History.
Europe--History--476-1492.
Middle Ages
Princeton subject headings: