631 | Add to Reading ListSource URL: www.ugr.esLanguage: English - Date: 2007-05-02 11:24:18
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632 | Add to Reading ListSource URL: timss.bc.eduLanguage: English - Date: 2003-04-08 21:43:42
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633 | Add to Reading ListSource URL: unesdoc.unesco.orgLanguage: English - Date: 2010-02-13 07:01:43
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634 | Add to Reading ListSource URL: isc.bc.eduLanguage: English - Date: 2007-10-12 12:48:46
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635 | Add to Reading ListSource URL: timssandpirls.bc.eduLanguage: English - Date: 2011-02-03 15:20:50
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636 | Add to Reading ListSource URL: www.historyliteracy.orgLanguage: English - Date: 2006-11-15 14:21:50
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637 | Add to Reading ListSource URL: teacher.scholastic.comLanguage: English - Date: 2005-06-29 13:50:10
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