Columbia subject headings:
Argentina--Social conditions.
Argentina--Social policy.
Labor movement--Argentina--History.
Labor policy--Argentina--History--19th century.
Labor policy--Argentina--History--20th century.
Harvard subject headings:
Argentina--Social conditions--19th century.
Argentina--Social conditions--20th century.
Argentina--Social policy.
Working class--Argentina
Princeton subject headings:
Argentina--Social conditions.
Argentina--Social policy.
Labor movement--Argentina--History.
Labor policy--Argentina--History--19th century.
Labor policy--Argentina--History--20th century.