51 | Add to Reading ListSource URL: www.niac.usra.eduLanguage: English - Date: 2012-10-10 14:59:03
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52 | Add to Reading ListSource URL: www.askmar.comLanguage: English - Date: 2009-01-01 23:42:02
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53 | Add to Reading ListSource URL: www.icarusinterstellar.orgLanguage: English - Date: 2011-02-09 19:11:01
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54 | Add to Reading ListSource URL: arxiv.orgLanguage: English - Date: 2011-09-26 20:02:19
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55 | Add to Reading ListSource URL: www.engr.psu.eduLanguage: English - Date: 2001-02-28 17:43:27
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56 | Add to Reading ListSource URL: arxiv.orgLanguage: English - Date: 2011-09-26 20:02:19
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