Columbia subject headings:
Harvard subject headings:
Middle Ages.
Naval history.
Navigation--Europe--History--To 1500.
Navigation--History--To 1500.
Seafaring life--Europe--History--To 1500.
Shipping--Europe--History--To 1500.
Ships--History
Princeton subject headings:
Navigation--Europe--History--To 1500.
Seafaring life--Europe--History--To 1500.
Shipping--Europe--History--To 1500.