Columbia subject headings:
London (England)--History--Bombardment, 1939-1945.
World War, 1939-1945--England--London.
Harvard subject headings:
Britain, Battle of, Great Britain, 1940.
Great Britain--History--Bombardment, 1940-1941.
Great Britain--History--George VI, 1936-1952.
Princeton subject headings:
London (England)--History--Bombardment, 1940-1945.
World War, 1939-1945--England--London.