Columbia subject headings:
Harvard subject headings:
Europe--Antiquities--Congresses.
Europe--History--476-1492--Congresses.
Europe--History--To 476--Congresses.
Europe--Social conditions--To 1492--Congresses.
Princeton subject headings:
Europe--Antiquities--Congresses.
Europe--History--476-1492--Congresses.
Europe--History--To 476--Congresses.