11 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-07-24 13:55:19
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12 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-04-04 08:25:29
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-30 10:01:16
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-07 08:11:48
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15 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-04-26 11:22:34
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16 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-06-15 11:05:58
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17 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 15:07:42
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18 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-06-19 07:06:04
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19 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 14:20:15
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20 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-02-03 16:18:28
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