Columbia subject headings:
Civilization, Medieval.
Civilization, Viking.
Scandinavia--History--To 1397.
Vikings--Europe.
Harvard subject headings:
Civilization, Medieval.
Civilization, Viking.
Europe--History--476-1492.
Europe--Relations--Scandinavia.
Scandinavia--History--To 1397.
Scandinavia--Relations--Europe.
Vikings--Europe.
Princeton subject headings:
Europe--History--476-1492.
Europe--Relations--Scandinavia.
Scandinavia--History--To 1397.
Scandinavia--Relations--Europe.