51 | Add to Reading ListSource URL: www.thecdi.comLanguage: English - Date: 2008-09-30 08:51:38
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52 | Add to Reading ListSource URL: www.thecdi.comLanguage: English - Date: 2009-01-05 06:19:58
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53 | Add to Reading ListSource URL: www.itia.infoLanguage: English - Date: 2014-05-17 10:43:52
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54 | Add to Reading ListSource URL: www.itia.infoLanguage: English - Date: 2011-08-09 07:55:38
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55 | Add to Reading ListSource URL: www.itia.infoLanguage: English - Date: 2013-08-02 05:50:06
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56 | Add to Reading ListSource URL: www.itia.infoLanguage: English - Date: 2011-07-09 10:50:02
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57 | Add to Reading ListSource URL: www.scienceinschool.orgLanguage: English - Date: 2010-11-22 15:46:33
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58 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1999-10-05 12:02:50
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59 | Add to Reading ListSource URL: www.inchem.orgLanguage: English - Date: 2008-04-02 09:35:37
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60 | Add to Reading ListSource URL: www.inchem.orgLanguage: English - Date: 2006-12-14 14:19:29
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