Columbia subject headings:
Harvard subject headings:
French language--21st century--Congresses.
French language--21st century.
French language--Foreign countries--Congresses.
French language--Spoken French--Congresses.
French language--Variation--Congresses.
Princeton subject headings:
French language--21st century--Congresses.
French language--Foreign countries--Congresses.
French language--Spoken French--Congresses.
French language--Variation--Congresses.