Columbia subject headings:
Harvard subject headings:
Mines (Military explosives)
Mountain warfare
Tyrol (Austria)--History.
World War, 1914-1918--Campaigns--Alps
World War, 1914-1918--Campaigns--Austria--Tyrol.
World War, 1914-1918--Campaigns--Italy
World War, 1914-1918--Tunnel warfare.
Princeton subject headings:
Mines and mineral resources--Italy--Trentino-Alto Adige--History.
Trentino-Alto Adige (Italy)--History.
World War, 1914-1918--Campaigns--Italy--Trentino-Alto Adige--History.