Columbia subject headings:
Harvard subject headings:
Bombers--History.
Germany. Luftwaffe--History--World War, 1939-1945.
Great Britain. Royal Air Force--History--World War, 1939-1945.
Lightning war.
World War, 1939-1945--Aerial operations, British.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Campaigns--France.
Princeton subject headings:
World War, 1939-1945--Campaigns--Western Front.
World War, 1939-1945--France.