61 | Add to Reading ListSource URL: ihda.orgLanguage: English - Date: 2013-11-20 16:58:41
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62 | Add to Reading ListSource URL: socialcompact.orgLanguage: English - Date: 2012-05-04 09:07:20
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63 | Add to Reading ListSource URL: serc.si.eduLanguage: English - Date: 2010-04-19 14:02:32
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64 | Add to Reading ListSource URL: urban.csuohio.eduLanguage: English - Date: 2007-02-22 14:23:09
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65 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2008-02-06 11:47:17
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66 | Add to Reading ListSource URL: www.ylc.yk.ca- Date: 2014-09-26 12:10:36
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67 | Add to Reading ListSource URL: www.bradley.eduLanguage: English - Date: 2013-03-07 09:31:52
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68 | Add to Reading ListSource URL: www.ilkidszone.infoLanguage: English - Date: 2011-10-28 14:42:43
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69 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2009-06-05 13:58:13
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70 | Add to Reading ListSource URL: www.ylc.yk.ca- Date: 2014-07-23 16:36:26
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