Columbia subject headings:
Socialism--Argentina--History.
Working class--Argentina--History.
Harvard subject headings:
Argentina--Politics and government.
Labor unions--Argentina--Political activity--History.
Labor unions--Political activity--Argentina--History.
Peronism--History.
Socialism--Argentina
Socialism--Argentina--History
Working class--Argentina--Political activity--History.
Working class--Political activity--Argentina--History.
Princeton subject headings:
Labor movement--Argentina--History.
Socialism--Argentina--History.