Columbia subject headings:
Harvard subject headings:
Germany. Luftwaffe.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Great Britain.
Princeton subject headings:
Great Britain--History--Bombardment, 1942.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Great Britain.