Columbia subject headings:
Shipbuilding--Europe, Northern--History.
Shipbuilding--Europe--History.
Ships, Ancient--Europe, Northern.
Ships, Ancient--Europe.
Harvard subject headings:
Shipbuilding--Europe, Northern--History.
Shipbuilding--Europe--History.
Ships, Ancient--Europe, Northern.
Ships, Ancient--Europe.
Princeton subject headings:
Shipbuilding--Europe, Northern--History.
Shipbuilding--Europe--History.
Ships, Ancient--Europe, Northern.
Ships, Ancient--Europe.