561 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:58:09
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562 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-10-07 10:37:57
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563 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:05:14
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564 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2013-03-26 13:53:41
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565 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:03:17
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566 | Add to Reading ListSource URL: ec.europa.euLanguage: English - Date: 2008-12-04 08:55:08
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567 | Add to Reading ListSource URL: www.wyoroad.infoLanguage: English - Date: 2012-09-27 18:02:46
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568 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:58:09
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569 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-08-09 12:29:36
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570 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 11:36:12
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