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Marusek, James A. "[1]Comet and Asteroid Impact Threat Analysis." Impact. http://personals.galaxyinternet.net/tunga/I8.htm
Asteroids
"Real (not reel) deep impacts: Sandia scientists predict what an asteroid strike would look like, really." Sandia National Laboratories. 5 May 1998. 2 Feb. 2004. <http://www.sandia.gov/media/comethit.htm>.
Cosmic Impacts
Van, Wayne. "Near Earth Objects" Federal Document Clearing House, Inc. 7 April 2004: Lexis Nexis
Asteroids
Rees, Martin. Our final h our: A scientist's warning: How terror, error and environment disaster threaten humankinds' future in this century -- on Earth and beyond. New York: Basic Books, 2003
Asteroids
Leslie, John. The End of the World. London: Rutledge, 1996
Asteroids
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