11 | Add to Reading ListSource URL: journeytospacefilm.comLanguage: English - Date: 2015-03-05 15:49:34
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12 | Add to Reading ListSource URL: www.aiaa.orgLanguage: English - Date: 2011-12-05 17:52:39
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13 | Add to Reading ListSource URL: www.marspapers.orgLanguage: English - Date: 2011-08-11 18:42:52
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14 | Add to Reading ListSource URL: www.zeilschipmars.nlLanguage: Dutch - Date: 2014-02-12 15:34:11
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15 | Add to Reading ListSource URL: webpages.charter.netLanguage: English - Date: 2015-01-14 15:25:56
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16 | Add to Reading ListSource URL: ntrs.nasa.govLanguage: English - Date: 2013-04-30 13:44:49
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17 | Add to Reading ListSource URL: www.astrosurf.comLanguage: English - Date: 2006-10-02 18:00:00
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18 | Add to Reading ListSource URL: www.reactionengines.co.ukLanguage: English - Date: 2015-02-03 11:52:35
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19 | Add to Reading ListSource URL: www.spacepolicyonline.comLanguage: English - Date: 2013-09-04 22:13:13
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20 | Add to Reading ListSource URL: odu.curtin.edu.auLanguage: English - Date: 2015-05-03 21:40:42
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