621 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:03:54
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622 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 10:45:21
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623 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-08-05 10:57:07
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624 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 11:46:13
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625 | Add to Reading ListSource URL: ec.europa.euLanguage: English - Date: 2014-04-16 08:26:29
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626 | Add to Reading ListSource URL: www.insg.orgLanguage: English - Date: 2010-11-25 11:03:51
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627 | Add to Reading ListSource URL: www.insg.orgLanguage: English - Date: 2014-04-05 19:06:00
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628 | Add to Reading ListSource URL: chemistry.about.comLanguage: English - Date: 2014-03-12 19:26:59
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629 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 11:05:36
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630 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 10:47:22
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