Columbia subject headings:
Ansaldo (Firm)--History--20th century.
Iron industry and trade--France--Cogne--History--20th century.
Iron industry and trade--Italy--History--20th century.
Steel industry and trade--France--Cogne--History--20th century.
Steel industry and trade--Italy--History--20th century.
Harvard subject headings:
Iron industry and trade--Italy--History.
Mines and mineral resources--Italy--History.
Princeton subject headings:
Ansaldo (Firm)--History--20th century.
Iron industry and trade--France--Cogne--History--20th century.
Iron industry and trade--Italy--History--20th century.
Steel industry and trade--France--Cogne--History--20th century.
Steel industry and trade--Italy--History--20th century.