Columbia subject headings:
Harvard subject headings:
Bombing, Aerial--Germany.
Great Britain. Royal Air Force. Bomber Command
World War, 1939-1945--Aerial operations, British.
Princeton subject headings:
Bombing, Aerial--Germany.
Great Britain. Royal Air Force. Bomber Command--History.
United States. Army Air Forces. Air Force, 8th
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.