71 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2006-08-15 09:13:26
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72 | Add to Reading ListSource URL: www.northwestu.eduLanguage: English - Date: 2013-08-22 18:34:57
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73 | Add to Reading ListSource URL: freshwater.org- Date: 2014-02-11 18:18:47
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74 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 11:04:02
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75 | Add to Reading ListSource URL: www2.dnr.cornell.eduLanguage: English - Date: 2014-03-26 09:04:32
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76 | Add to Reading ListSource URL: www.tpr.alberta.caLanguage: English - Date: 2014-05-12 13:08:40
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77 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-04-25 11:03:44
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78 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-11-02 12:51:31
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79 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-11-15 11:12:10
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80 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-09-19 10:41:06
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