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.
The Manhattan Project Investigating Group
Summary of Damages and Injuries
The Selection of the Target
Description of the Cities Before the Bombings
General Comparison of Hiroshima and Nagasaki
General Description of Damage Caused by the Atomic Explosions
The Nature of an Atomic Explosion
Characteristics of the Damage Caused by the Atomic Bombs
Calculations of the Peak Pressure of the Blast Wave
Long Range Blast Damage
Shielding, or Screening, from the Blast
Characteristics of Injuries to Persons
Shielding from Radiation
Effects of the Atomic Bombings on the
Inhabitants of the Cities
Appendix: Father Siemes' eyewitness account
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