Columbia subject headings:
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Aerial operations, Italian.
Harvard subject headings:
Germany. Luftwaffe--History--World War, 1939-1945.
Italy. Aeronautica--History--World War, 1939-1945.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Aerial operations, Italian.
Princeton subject headings:
Germany. Luftwaffe--History--World War, 1939-1945.
Italy. Aeronautica--History--World War, 1939-1945.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Aerial operations, Italian.