11 | Add to Reading ListSource URL: www2.astronomicalheritage.orgLanguage: English - Date: 2011-11-29 08:08:34
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12 | Add to Reading ListSource URL: physics.mq.edu.auLanguage: English - Date: 2014-05-21 00:38:56
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13 | Add to Reading ListSource URL: physics.mq.edu.auLanguage: English - Date: 2013-08-29 21:40:31
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14 | Add to Reading ListSource URL: ieti.orgLanguage: English - Date: 2006-08-09 23:10:18
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15 | Add to Reading ListSource URL: www.ciuhct.comLanguage: English - Date: 2011-06-19 01:30:27
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