Columbia subject headings:
Harvard subject headings:
Civilization, Medieval--Congresses
Language and culture--Europe--History--Congresses.
Language and languages--Congresses
Multilingualism--Europe--History--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
Language and culture--Europe--History--Congresses.
Language and languages--Congresses.
Multilingualism--Europe--History--Congresses.