This report describes the effects of the atomic bombs which were
dropped on the Japanese cities of Hiroshima and Nagasaki on August 6
and 9, 1945, respectively. It summarizes all the authentic information
that is available on damage to structures, injuries to personnel,
morale effect, etc., which can be released at this time without
prejudicing the security of the United States.
This report has been compiled by the Manhattan Engineer District of the
United States Army under the direction of Major General Leslie R.
Groves. Special acknowledgement to those whose work contributed
largely to this report is made to:
The Special Manhattan Engineer District Investigating Group,
The United States Strategic Bombing Survey,
The British Mission to Japan, and
The Joint Atomic Bomb Investigating Group (Medical). and particularly
to the following individuals:
Col. Stafford L. Warren, Medical Corps, United States Army, for his
evaluation of medical data,
Capt. Henry L. Barnett, Medical Corps, United States Army, for his
evaluation of medical data,
Dr. R. Serber, for his comments on flash burn,
Dr. Hans Bethe, Cornell University, for his information of the nature
of atomic explosions,
Majors Noland Varley and Walter C. Youngs, Corps of Engineers, United
States Army, for their evaluation of physical damage to structures,
J. 0. Hirschfelder, J. L. Magee, M. Hull, and S. T. Cohen, of the Los
Alamos Laboratory, for their data on nuclear explosions,
Lieut. Col. David B. Parker, Corps of Engineers, United States Army,
for editing this report.