71 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-07-01 18:04:25
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72 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-01-10 17:32:38
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73 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-11-26 10:37:56
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74 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-09 17:35:29
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75 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-05-14 17:48:07
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76 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-15 12:19:02
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77 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-10-21 14:59:21
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78 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2009-05-11 11:59:39
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79 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-11-14 15:57:22
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80 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 11:19:06
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