61 | Add to Reading ListSource URL: www.hort.vt.eduLanguage: English - Date: 2006-12-13 16:33:34
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62 | Add to Reading ListSource URL: www.canross.comLanguage: English - Date: 2013-04-12 16:36:33
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63 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-01-24 15:10:13
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64 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 14:50:52
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65 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-07 14:52:16
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66 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 08:35:08
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67 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-24 10:12:40
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68 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 13:29:02
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69 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-29 14:38:32
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70 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 11:08:27
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