Columbia subject headings:
Franks--Congresses.
Vikings--Congresses.
Harvard subject headings:
Civilization, Viking--Europe, Western--Congresses.
Civilization, Viking--France--Congresses.
Excavations (Archaeology)--France--Congresses
Excavations (Archaeology)--Scandinavia--Congresses.
France--Antiquities--Congresses.
France--History--To 987--Congresses.
Franks
Franks--Congresses.
Scandinavia--History--To 1397--Congresses.
Viking antiquities--France--Congresses.
Viking antiquities--Scandinavia--Congresses.
Vikings
Vikings--Congresses.
Princeton subject headings:
Franks.
Vikings.