Columbia subject headings:
Harvard subject headings:
Hamburg (Germany)--History--Bombardment, 1940-1945.
Operation Gomorrah, 1943.
World War, 1939-1945--Germany--Hamburg.
Princeton subject headings:
Hamburg (Germany)--Bombardment, 1943.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.
World War, 1939-1945--Germany (West)--Hamburg.