521 | Add to Reading ListSource URL: www.nctm.orgLanguage: English - Date: 2013-02-12 13:47:10
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522 | Add to Reading ListSource URL: mathforum.orgLanguage: English - Date: 2014-02-28 13:39:56
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523 | Add to Reading ListSource URL: www.naeyc.orgLanguage: English - Date: 2011-05-02 14:43:23
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524 | Add to Reading ListSource URL: www.centeroninstruction.orgLanguage: English - Date: 2009-06-01 08:19:19
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525 | Add to Reading ListSource URL: cs.smu.caLanguage: English - Date: 2009-08-18 11:23:50
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526 | Add to Reading ListSource URL: www.mdk12.orgLanguage: English - Date: 2010-06-28 23:12:18
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527 | Add to Reading ListSource URL: hrd.apec.orgLanguage: English - Date: 2009-06-18 14:57:37
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528 | Add to Reading ListSource URL: sites.cde.state.co.usLanguage: English - Date: 2013-05-02 16:27:37
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529 | Add to Reading ListSource URL: www.narragansett.k12.ri.usLanguage: English - Date: 2008-05-05 22:29:46
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530 | Add to Reading ListSource URL: wvde.state.wv.usLanguage: English - Date: 2010-04-22 11:16:42
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