Columbia subject headings:
Argentina--Population--History--20th century.
Argentina--Social conditions--20th century.
Social classes--Argentina--History--20th century.
Social structure--Argentina--History--20th century.
Harvard subject headings:
Argentina--Population--History--20th century.
Argentina--Social conditions--20th century.
Social classes--Argentina--History--20th century.
Social structure--Argentina--History--20th century.
Princeton subject headings:
Argentina--Population--History--20th century.
Argentina--Social conditions--20th century.
Social classes--Argentina--History--20th century.
Social structure--Argentina--History--20th century.