www.cccoe.k12.ca.us/abomb/physics.htm
www.waunakee.k12.wi.us/intermediate/computerconcepts/biweb/keaton
www.atomarchive.com/Fission/Fission1.shtml
www.straightdope.com/classics/a990101a.html
chnm.gmu.edu/courses/122/hiro/hiroshimaframe.html
www.google.com
www.hiroshima-cdas.or.jp/HICARE/abe.html
