11 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2000-10-31 08:06:15
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12 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:11
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 10:44:06
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 11:03:42
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15 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 14:35:57
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16 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-18 09:47:29
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17 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-06 11:56:53
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18 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-01 13:06:15
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19 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-02-14 10:55:21
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20 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 11:24:42
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