71 | Add to Reading ListSource URL: www.acs-online.orgLanguage: English - Date: 2014-02-04 12:21:28
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72 | Add to Reading ListSource URL: www.idc.co.zaLanguage: English - Date: 2013-08-26 10:35:48
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73 | Add to Reading ListSource URL: www2.epa.govLanguage: English - Date: 2013-12-11 06:33:53
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74 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 11:00:44
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75 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-12-03 15:30:01
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76 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-08-15 11:47:46
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77 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-10-27 12:22:48
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78 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-10-18 12:36:21
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79 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-12-13 15:06:28
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80 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-11-22 14:54:00
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