Columbia subject headings:
Great Britain. Royal Air Force.
United States. Army Air Forces.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.
Harvard subject headings:
Great Britain. Royal Air Force
United States. Army Air Forces.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.
Princeton subject headings:
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.