JF Ptak Science Books Quick Post This is a short entry to a long thread Series on Atomic and Nuclear Weapons
Hiroshima firestorm map from United States Strategic Bombing Survey Report 92 volume 2, The Effects of the Atomic Bomb on Hiroshima, Japan:
See: The Effects of the Atomic Bomb on Hiroshima, Japan (the secret
U.S. Strategic Bombing Survey report 92, Pacific Theatre) located here.
And this: long description of the report can be found at the Internet Archive, here.