Columbia subject headings:
Harvard subject headings:
Gervasone family.
Gervasone, Bartolomeo.
Iron industry and trade--Italy--Valle d'Aosta--History.
Mineral industries--Italy--Valle d'Aosta--History.
Princeton subject headings:
Gervasone family.
Iron industry and trade--Italy--Valle d'Aosta--History.
Mineral industries--Italy--Valle d'Aosta--History.