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Gregory Jarvis Gregory Gaultier Gregory C. Johnson Gregory H. Johnson Gregory Goyle Gregory Winter Gregory dari Nazianzus Grégory Coupet Gregor Mendel Gregorio del Pilar, Ilocos SelatanRujukan
WikiPedia: Gregory H. Johnson http://www.spacefacts.de/bios/astronauts/english/j... http://www.iss-casis.org/About/CASISLeadership/Exe... https://web.archive.org/web/20090328033550/http://... https://web.archive.org/web/20140426042723/http://...