41 | Add to Reading ListSource URL: dasch.rc.fas.harvard.eduLanguage: English - Date: 2012-11-08 09:46:36
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42 | Add to Reading ListSource URL: www.frontiercollegebooks.caLanguage: English - Date: 2014-02-18 11:22:11
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43 | Add to Reading ListSource URL: www.nationalarchives.gov.ukLanguage: English - Date: 2004-12-16 05:47:43
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44 | Add to Reading ListSource URL: www.kiss.caltech.eduLanguage: English - Date: 2013-08-16 13:52:28
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45 | Add to Reading ListSource URL: www.princetonastronomy.orgLanguage: English - Date: 2008-04-01 21:30:52
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46 | Add to Reading ListSource URL: tdc-www.harvard.eduLanguage: English - Date: 2003-12-01 14:39:25
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47 | Add to Reading ListSource URL: had.aas.orgLanguage: English - Date: 2010-10-21 12:23:58
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48 | Add to Reading ListSource URL: vault.it.northwestern.eduLanguage: English - Date: 2014-04-16 14:01:11
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49 | Add to Reading ListSource URL: tdc-www.harvard.eduLanguage: English - Date: 2005-09-30 17:49:46
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50 | Add to Reading ListSource URL: tdc-www.harvard.eduLanguage: English - Date: 2005-11-01 15:18:20
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