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 Challenger Center.  2007.  <http://www.challenger.org/>.

 Human Spaceflight. NASA. 2007. <http://spaceflight.nasa.gov/home/index.html>.

 Mars Exploration Program. NASA.  <http://mpfwww.jpl.nasa.gov/>.

 NASA Astronauts. NASA.  <http://www.hq.nasa.gov/office/pao/History/nauts.html>.