81 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-02-25 10:13:04
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82 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2008-02-08 09:29:36
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83 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2008-03-11 12:37:27
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84 | Add to Reading ListSource URL: www.nmnhs.comLanguage: English - Date: 2010-09-28 06:33:08
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85 | Add to Reading ListSource URL: www.nmnhs.comLanguage: English - Date: 2010-09-28 06:32:52
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86 | Add to Reading ListSource URL: www.socm.orgLanguage: English - Date: 2014-05-15 16:20:07
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87 | Add to Reading ListSource URL: www.mysembrancher.comLanguage: English - Date: 2011-01-18 05:33:49
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88 | Add to Reading ListSource URL: www.mineral-exploration.deLanguage: German - Date: 2014-02-16 15:04:47
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89 | Add to Reading ListSource URL: www.smmp.netLanguage: English - Date: 2004-01-26 16:57:11
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90 | Add to Reading ListSource URL: novascotia.caLanguage: English - Date: 2010-09-13 11:20:28
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