Columbia subject headings:
Commerce--History--Medieval, 500-1500.
Entrepreneurship--History--To 1500.
Harvard subject headings:
Commerce--History--Medieval, 500-1500
Economic history--Medieval, 500-1500
England--Commerce--History--To 1500.
England--Economic conditions--1066-1485.
Entrepreneurship--History--To 1500.
Markets--History--To 1500.
Princeton subject headings:
Great Britain--Commerce--History--To 1500.