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Nuclear weapons:0 G$ W) V- `% H/ R: o! b" H+ @2 w! I6 P
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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: O! W4 w9 I4 T7 s$ v' {* R! |8 qWeapons of Mass Destruction. (2003). In Harvey Kushner (Ed.), Encyclopedia of Terrorism, Vol. 1. (404-406). Thousand Oaks: Sage Reference. Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale:
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+ N- b( f+ j3 H, I$ uNuclear Weapons. (2006). Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Vol. 4. (1891-1898). Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale: $ s( m* p* h6 C6 D5 s
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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Clark, Roger. (2005). Nuclear Weapons. In Dinah Shelton (Ed.), Encyclopedia of Genocide and Crimes Against Humanity, Vol. 2. (754-761). Detroit: Macmillan Reference USA. Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale:
' u, j: @; j; S4 ?<http://find.galegroup.com/gvrl/i ... 925&version=1.0>5 ^! `4 e# C" ^: a
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Lerner, K. Lee, Gilman, Larry, & Haycock, Dean Allen. (2004). Nuclear Weapons. In K. Lee Lerner & Brenda Lerner (Eds.), Gale Encyclopedia of Science, Vol. 4. (3rd ed., 2816-2821). Detroit: Gale. Retrieved October 22, 2008, from Gale Virtual Reference Library via Gale:
( C0 i$ J* i& ?4 s' y+ w! Q<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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5 F4 X/ `! K& H {6 E& v/ rcritical mass- e; O. w6 u2 H9 B. @ X
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- T: D$ C6 g! _" w: |1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
" {' ]: u) U* q. _5 Y# b2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
+ @, i- `- M7 G3 K<http://www.thefreedictionary.com/critical+mass>
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