5 soucres

Title:	Truman and the bomb.
Authors:	Hamby, Alonzo L.

https://www.lib.byu.edu/cgi-bin/remoteauth.pl?url=http://search.ebscohost.com/login.aspx?direct=true&db=wdh&AN=9508234157&site=ehost-live&scope=site

Title:	Yasui Kaoru: citizen-scholar in war and peace.
Authors:	Orr, James J.1

https://www.lib.byu.edu/cgi-bin/remoteauth.pl?url=http://search.ebscohost.com/login.aspx?direct=true&db=aph&AN=3870142&site=ehost-live&scope=site

The Manhattan Project (and Before)

http://nuclearweaponarchive.org/Usa/Med/Med.html

http://en.wikipedia.org/wiki/Harry_S._Truman

http://en.wikipedia.org/wiki/Franklin_D._Roosevelt