11 | Add to Reading ListSource URL: www.onetcenter.orgLanguage: English - Date: 2014-03-18 21:43:26
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12 | Add to Reading ListSource URL: mitsloan.mit.eduLanguage: English - Date: 2003-11-16 19:50:32
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13 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-12 13:19:39
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14 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-04-25 13:44:34
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