Columbia subject headings:
Harvard subject headings:
Iron and steel workers--Labor unions--Italy--Piombino--History--20th century.
Magona d'Italia (Firm)--History--20th century.
Strikes and lockouts--Iron industry--Italy--Piombino--History--20th century.
Strikes and lockouts--Steel industry--Italy--Piombino--History--20th century.
Princeton subject headings:
Iron and steel workers--Labor unions--Italy--Piombino--History--20th century.
Magona d'Italia (Firm)--History--20th century.
Strikes and lockouts--Iron industry--Italy--Piombino--History--20th century.
Strikes and lockouts--Steel industry--Italy--Piombino--History--20th century.