Columbia subject headings:
World War, 1914-1918--Aerial operations, German.
World War, 1914-1918--Campaigns--England.
Harvard subject headings:
World War, 1914-1918--Aerial operations, German
World War, 1914-1918--Campaigns--England
Princeton subject headings:
World War, 1914-1918--Aerial operations, German.
World War, 1914-1918--Campaigns--England.