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 Dumoulin, Jim.  Project Gemini.  NASA.  <http://science.ksc.nasa.gov/history/gemini/gemini.html>.

 Hacker, Barton C. and Charles C. Alexander.  On the Shoulders of Titans: A History of Project Gemini.  The NASA Historical Series.

     <http://www.hq.nasa.gov/office/pao/History/SP-4203/cover.htm>.