Columbia subject headings:
Parti socialiste belge--Belgium--Borinage--History.
Socialism--Belgium--History.
Working class--Political activity--Belgium--Borinage.
Harvard subject headings:
Labor movement--Belgium--Borinage--History.
Parti socialiste belge--History.
Socialism--Belgium
Socialism--Belgium--Borinage--History.
Working class--Political activity--Belgium--Borinage.
Princeton subject headings:
Labor movement--Belgium--Borinage--History.
Labor unions--Belgium--Borinage--History.
Socialism--Belgium--Borinage--History.