Columbia subject headings:
Teachers' unions--Italy--Turin--History--20th century.
Teachers--Political activity--Italy--Turin--20th century.
Harvard subject headings:
Labor unions and education--Italy--Turin--History--20th century.
Labor unions--Italy--Turin--History--20th century.
Teachers' unions--Italy--Turin--History--20th century.
Teachers--Political activity--Italy--Turin--20th century.
Princeton subject headings:
Labor unions and education--Italy--Turin--History--20th century.
Labor unions--Italy--Turin--History--20th century.