Mars Direct

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221	PDF Document Add to Reading List Source URL: marsjournal.org Language: English - Date: 2010-11-16 20:09:15 Space colonization Mars exploration Exploration of the Moon Mars Direct Life support system Manned mission to Mars Exploration of Mars Water on Mars Mars program Spaceflight Space technology Human spaceflight
222	PDF Document Add to Reading List Source URL: ia600605.us.archive.org Language: English - Date: 2011-04-18 19:40:42 Spacecraft propulsion Ion thruster Hall effect thruster Mars sample return mission Mars Direct Dawn Sample return mission Exploration of Mars Electrically powered spacecraft propulsion Spaceflight Space technology Spacecraft
223	PDF Document Add to Reading List Source URL: www.4frontierscorp.com Language: English - Date: 2009-11-27 22:25:49 Space colonization Mars exploration Human spaceflight Mars Colonization of Mars Terraforming Mars Direct Interplanetary spaceflight Robert Zubrin Spaceflight Space technology Space
224	PDF Document Add to Reading List Source URL: archive.gao.gov Language: English - Date: 2005-08-10 10:06:20 Manned spacecraft Government of the United States NASA Michael Collins Space exploration DIRECT Apollo 1 International Space Station Mars to Stay Spaceflight Human spaceflight Apollo program