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Hacker, Barton C.; Grimwood, James M. (February 2003) [First published 1977]. "Table of Contents". On the Shoulders of Titans: A History of Project Gemini. NASA History Division, Office of Policy and Plans. NASA History Series. Washington, D.C.: NASA. NASA SP-4203. Dicapai pada 12 September 2013. Unknown parameter |chapterurl= ignored (bantuan)
