1. President Bush Announces New Vision for Space Exploration Program, The White House Press Office. Washington, DC: January 14, 2004.
2. New Vision for Space Exploration—Fact Sheet, The White House, Washington, DC: January 14, 2004.
3. Letter to the President, signed by multiple Members of Congress, October 29, 2003, in authors’ files.
4. Transcript, Press Briefing of the Columbia Accident Investigation Board. Washington, DC: August 26. 2003. Available at, CAIB website: http://www.caib.us/.
5. The National Commission on Space. Pioneering the Space Frontier, Bantam Books. New York: May 1986.