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  • DARPA Oblique Flying Wing http://www.darpa.mil/tto/programs/ofw.htm
  • "F-22 Raptor Cost." GlobalSecurity.org, March 15, 2006. http://www.globalsecurity.org/military/systems/aircraft/f-22-cost.htm
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  • Cramer, M.S. "Sonic Boom, Sound Barrier, and Condensation Clouds." Fluid Mechanics, Cambridge University Press, 2004. http://www.fluidmech.net/tutorials/sonic/soundbarrier.htm
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  • "USA: Northrop Awarded Contract to Develop a Conceptual Design." TMC.net, March 19, 2006. http://www.tmcnet.com/usubmit/2006/03/19/1470791.htm