Columbia subject headings:
Harvard subject headings:
Belgium--Civilization--Congresses.
Belgium--Relations--Canada--Congresses.
Canada--Civilization--Congresses.
Canada--Relations--Belgium--Congresses.
French philology--Congresses.
Princeton subject headings:
Belgium--Relations--France--Congresses.
Canada--Relations--United States--Congresses.
France--Relations--Belgium--Congresses.
International relations--Congresses.
United States--Relations--Canada--Congresses.