Columbia subject headings:
Esposizione internazionale del Sempione (1906 : Milan, Italy)--Exhibitions.
Industrialization--Italy--Milan--20th century--Exhibitions.
Simplon-Tunnel (Brig, Switzerland, and Iselle, Italy)--History--Exhibitions.
Harvard subject headings:
Esposizione internazionale del Sempione (1906 : Milan, Italy)
Industrialization--Milan--Italy--20th century--Exhibitions.
Inventions--History
Science--History
Technology--History
Princeton subject headings:
Esposizione internazionale del Sempione (1906 : Milan, Italy)