Columbia subject headings:
Harvard subject headings:
Great Britain--Civilization--Scandinavian influences--Congresses.
Normans--Antiquities--Congresses.
Vikings--Congresses.
Vikings--France--Congresses.
Vikings--Great Britain--Congresses.
Princeton subject headings:
Archaeology, Medieval--Congresses.
Europe--History--476-1492--Congresses.
Excavations (Archaeology)--Europe--Congresses.