Columbia subject headings:
Fortification--Italy--Trentino-Alto Adige--History--20th century.
Trentino-Alto Adige (Italy)--History, Military.
World War, 1914-1918--Italy--Trentino-Alto Adige.
Harvard subject headings:
Fortification--Italy--Trentino-Alto Adige--History--20th century.
Trentino-Alto Adige (Italy)--History, Military.
World War, 1914-1918--Italy--Trentino-Alto Adige.
Princeton subject headings: