Columbia subject headings:
Harvard subject headings:
Austro-Hungarian Monarchy. Heer--Aviation--History.
Trentino-Alto Adige (Italy)--History.
Tyrol (Austria)--History.
World War, 1914-1918--Aerial operations, Austrian.
World War, 1914-1918--Campaigns--Austria--Tyrol.
World War, 1914-1918--Campaigns--Italy--Trentino-Alto Adige.
Princeton subject headings:
Austro-Hungarian Monarchy. Heer--Aviation--History.
Trentino-Alto Adige (Italy)--History.
Tyrol (Austria)--History.
World War, 1914-1918--Aerial operations, Austrian.
World War, 1914-1918--Campaigns--Austria--Tyrol.
World War, 1914-1918--Campaigns--Italy--Trentino-Alto Adige.