Columbia subject headings:
London (England)--History--Bombardment, 1940-1941.
World War, 1939-1945--Aerial operations, German.
Harvard subject headings:
London (England)--History--Bombardment, 1940-1941.
World War, 1939-1945--Aerial operations, German.
Princeton subject headings:
London (England)--Description and travel.
London (England)--History--1800-1950.
London (England)--History--Bombardment, 1940-1941.