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In page Mars Direct:
"The Mars Society and Stanford studies retain the original two-vehicle mission profile of Mars Direct, but increase the crew size to six.[citation needed] A study by Donald Barker and AIAA called Solar System Longboats also uses a two-vehicle system and a crew of six, but splits it between a two identical vehicle pairs (each with a crew of three, but capable of carrying all six in an emergency), as well as adding an inflatable living space and a water-based radiation shelter to the ERV.[1]
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