Columbia subject headings:
Argentina--Emigration and immigration--History--20th century.
Labor unions--Argentina--History--20th century.
Socialism--Argentina--History--20th century.
Strikes and lockouts--Argentina--History--20th century.
Working class--Argentina--History--20th century.
Harvard subject headings:
Argentina--Emigration and immigration--History--20th century.
Labor unions--Argentina--History--20th century
Socialism--Argentina--20th century.
Socialism--Argentina--History--20th century
Strikes and lockouts--Argentina--History--20th century.
Working class--Argentina--History--20th century.
Princeton subject headings:
Argentina--Emigration and immigration--History--20th century.
Labor unions--Argentina--History--20th century.
Socialism--Argentina--History--20th century.
Strikes and lockouts--Argentina--History--20th century.
Working class--Argentina--History--20th century.