Columbia subject headings:
Harvard subject headings:
French language--Canada--Congresses.
French language--Dialects--Canada--Congresses.
French language--Dialects--France--Congresses.
French language--Variation--Congresses.
Princeton subject headings:
French language--Canada--Congresses.
French language--Dialects--Canada--Congresses.
French language--Dialects--France--Congresses.
French language--Variation--Congresses.