Columbia subject headings:
Foreign workers--France--History--20th century.
France--Emigration and immigration--History--20th century.
Labor supply--France--History--20th century.
Harvard subject headings:
Foreign workers--France--History--20th century.
France--Emigration and immigration--History--20th century.
Labor supply--France--History--20th century.
Princeton subject headings:
Foreign workers--France--History--20th century.
France--Emigration and immigration--History--20th century.
Labor supply--France--History--20th century.