Columbia subject headings:
Great Britain--History--Anglo-Saxon period, 449-1066--Congresses.
Old Norse language--Congresses.
Vikings--England, Northern--Congresses.
Harvard subject headings:
Great Britain--Anglo-Saxon period, 449-1066--Congresses.
Old Norse language--Congresses.
Vikings--England, Northern--Congresses.
Princeton subject headings:
Great Britain--Anglo-Saxon period, 449-1066--Congresses.
Old Norse language--Congresses.
Vikings--England, Northern--Congresses.