Ground Zero at Nagasaki - after bombing.
United States Strategic Bombing Survey
published 1946
The Effects of Atomic Bombs on Hiroshima and Nagasaki. United States Government Printing Office, Washington. <a rel="nofollow" class="external text" href="http://www.ibiblio.org/hyperwar/AAF/USSBS/AtomicEffects/img/">ibiblio.org</a>