Columbia subject headings:
Civilization, Viking.
Political customs and rites--Scandinavia--History--To 1500.
Vikings--Politics and government.
Harvard subject headings:
Civilization, Viking.
Political customs and rites--Scandinavia--History--To 1500.
Vikings--Politics and government.
Princeton subject headings:
Civilization, Viking.
Political customs and rites--Scandinavia--History--To 1500.
Vikings--Politics and government.