Columbia subject headings:
Harvard subject headings:
Atomic bomb--United States.
Hiroshima-shi (Japan)--History--Bombardment, 1945.
Nagasaki-shi (Japan)--History--Bombardment, 1945.
Nuclear warfare--Moral and ethical aspects
World War, 1939-1945--Moral and ethical aspects.
Princeton subject headings:
Atomic bomb--United States--History.
Hiroshima-shi (Japan)--History--Bombardment, 1945.
Nagasaki-shi (Japan)--History--Bombardment, 1945.
United States. Army. Corps of Engineers. Manhattan District--History.