51 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-06 10:31:59
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52 | Add to Reading ListSource URL: kimmillerconcernedchristians.comLanguage: English - Date: 2008-02-20 08:30:47
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53 | Add to Reading ListSource URL: www.fibertecinc.comLanguage: English - Date: 2012-07-31 19:02:49
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54 | Add to Reading ListSource URL: www.fibertecinc.comLanguage: English - Date: 2012-07-31 19:02:48
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55 | Add to Reading ListSource URL: www.fibertecinc.comLanguage: English - Date: 2012-07-31 19:02:49
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56 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 02:49:40
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57 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 00:11:40
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58 | Add to Reading ListSource URL: myweb.uiowa.eduLanguage: English - Date: 2008-10-14 16:29:25
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59 | Add to Reading ListSource URL: www.handbookofmineralogy.comLanguage: English - Date: 2007-09-30 02:59:40
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60 | Add to Reading ListSource URL: www.minsocam.orgLanguage: English - Date: 2007-04-03 18:05:48
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