Columbia subject headings:
Harvard subject headings:
Agricultural laborers--Argentina--Pampas--History--20th century.
Labor movement--Argentina--Pampas--History--20th century.
Labor unions--Argentina--Pampas--History--20th century.
Princeton subject headings:
Agricultural laborers--Labor unions--Argentina.
Argentina--Rural conditions.
Peasants--Argentina.
Strikes and lockouts--Agricultural laborers--Argentina.