81 | Add to Reading ListSource URL: s3.documentcloud.orgLanguage: English - Date: 2014-07-30 13:42:28
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82 | Add to Reading ListSource URL: www.tvakids.comLanguage: English - Date: 2002-12-02 14:29:40
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83 | Add to Reading ListSource URL: www.cra-arc.gc.caLanguage: English - Date: 2014-07-28 07:16:43
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84 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2006-05-31 13:42:38
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85 | Add to Reading ListSource URL: www.asrc.cestm.albany.eduLanguage: English - Date: 2009-03-02 17:03:40
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86 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2006-11-03 18:00:00
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87 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-21 13:42:45
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88 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2012-11-08 17:40:41
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89 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2012-11-08 17:40:41
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90 | Add to Reading ListSource URL: science.nature.nps.govLanguage: English - Date: 2013-06-03 13:38:39
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