Columbia subject headings:
Harvard subject headings:
Bombing, Aerial--Germany--Psychological aspects.
Bombing, Aerial--Moral and ethical aspects--Germany.
Cities and towns--Germany.
Germany--History--Bombardment, 1940-1945.
Morale.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.
World War, 1939-1945--Destruction and pillage--Germany.
Princeton subject headings:
Bombing, Aerial--Germany--Psychological aspects.
Bombing, Aerial--Moral and ethical aspects.
Cities and towns--Germany.
Morale.
World War, 1939-1945--Aerial operations, American.
World War, 1939-1945--Aerial operations, British.
World War, 1939-1945--Destruction and pillage--Germany.