Columbia subject headings:
Labor unions--France--History--20th century--Congresses.
Syndicalism--France--History--20th century--Congresses.
Harvard subject headings:
Labor unions--France--History--20th century.
Syndicalism--France--History--20th century.
Princeton subject headings:
Labor unions--France--History--20th century--Congresses.
Syndicalism--France--History--20th century--Congresses.