Columbia subject headings:
Harvard subject headings:
French language--Dialects--French-speaking countries--Congresses.
French language--French-speaking countries--Congresses.
French language--Social aspects--French-speaking countries--Congresses.
French language--Variation--French-speaking countries--Congresses.
Princeton subject headings:
French language--Dialects--French-speaking countries--Congresses.
French language--French-speaking countries--Congresses.
French language--Social aspects--French-speaking countries--Congresses.
French language--Variation--French-speaking countries--Congresses.