Columbia subject headings:
Federación Obrera Regional Argentina--History--20th century.
Labor unions--Argentina--History--20th century.
Working class--Argentina--History--20th century.
Harvard subject headings:
Federación Obrera Regional Argentina--History--20th century.
Labor unions--Argentina--History--20th century
Working class--Argentina--History--20th century.
Princeton subject headings:
Federación Obrera Regional Argentina--History--20th century.
Labor movement--Argentina--History--20th century.
Labor unions--Argentina--History--20th century.