11 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2004-05-19 10:26:41
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12 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2004-05-19 10:26:39
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13 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2011-12-12 17:22:32
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14 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 11:36:10
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15 | Add to Reading ListSource URL: pebblescience.orgLanguage: English - Date: 2011-11-28 02:12:09
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16 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-12-12 17:22:32
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17 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-12-12 17:22:32
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18 | Add to Reading ListSource URL: www.handbookofmineralogy.orgLanguage: English - Date: 2007-09-30 02:59:04
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19 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 02:59:04
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20 | Add to Reading ListSource URL: reclamationresearch.netLanguage: English - Date: 2009-10-21 17:35:22
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