11 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:22
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12 | Add to Reading ListSource URL: www.cscbooksaver.comLanguage: English - Date: 2008-11-05 05:37:08
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 09:03:50
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-06-19 07:54:16
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15 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 09:55:24
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16 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 11:26:47
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17 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-08-14 15:49:46
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18 | Add to Reading ListSource URL: www.rusal.ruLanguage: English - Date: 2012-04-29 20:09:48
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