61 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-09-13 10:43:42
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62 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-07-09 16:39:37
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63 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-08-09 17:23:37
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64 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-12-19 11:45:41
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65 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-06-19 09:14:20
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66 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-09-19 12:40:03
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67 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-09-30 13:18:10
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68 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-28 07:45:40
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69 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-10-24 10:37:46
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70 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-05-16 16:05:25
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