Columbia subject headings:
Harvard subject headings:
Lafargue, Paul, 1842-1911
Parti socialiste de France--History.
Socialists--France--Biography
Working class--France--Political activity--History--19th century.
Working class--Political activity--France--History--19th century.
Princeton subject headings:
Labor--France--History.
Lafargue, Paul, 1842-1911.