Columbia subject headings:
Iron industry and trade--Italy--Alps, Italian--History.
Iron--Italy--Alps, Italian--Metallurgy.
Harvard subject headings:
Alps, Italian (Italy)--Economic conditions.
Iron industry and trade--Italy--Alps, Italian--History.
Iron industry and trade--Italy--Alps, Italian.
Iron--Italy--Alps, Italian--Metallurgy--History.
Iron--Italy--Alps, Italian--Metallurgy.
Princeton subject headings:
Iron industry and trade--Italy--Alps, Italian--History.
Iron--Italy--Alps, Italian--Metallurgy.