671 | Add to Reading ListSource URL: www.sapphminco.comLanguage: English - Date: 2012-02-29 02:28:00
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672 | Add to Reading ListSource URL: www.psemi.comLanguage: English - Date: 2013-01-07 11:05:31
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673 | Add to Reading ListSource URL: www.psemi.comLanguage: English - Date: 2013-01-07 11:08:49
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674 | Add to Reading ListSource URL: www.fieldgemology.orgLanguage: English - Date: 2010-01-27 11:49:50
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675 | Add to Reading ListSource URL: www.foresthistory.orgLanguage: English - Date: 2010-04-19 10:15:36
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676 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-06-30 09:10:02
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677 | Add to Reading ListSource URL: www.gem-a.comLanguage: English - Date: 2012-01-04 09:51:25
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678 | Add to Reading ListSource URL: www.gem-a.comLanguage: English - Date: 2008-11-11 03:45:34
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679 | Add to Reading ListSource URL: www.bgs.ac.ukLanguage: English - Date: 2007-06-12 12:22:27
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680 | Add to Reading ListSource URL: english.clas.asu.eduLanguage: English - Date: 2009-01-04 17:07:32
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