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Date: 2011-09-29 19:08:31Human spaceflight Manned spacecraft Commercial Orbital Transportation Services Spacecraft Dragon Rocketplane Kistler International Space Station program Falcon 9 Cygnus Spaceflight Space technology SpaceX | GAO Logo (Black_white-w_stroke)coverAdd to Reading ListSource URL: www.gao.govDownload Document from Source WebsiteFile Size: 420,96 KBShare Document on Facebook |