51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-08-28 09:53:09
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1997-01-24 08:27:13
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53 | Add to Reading ListSource URL: hpschapters.orgLanguage: English - Date: 2004-11-16 21:10:44
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54 | Add to Reading ListSource URL: www.jpands.orgLanguage: English - Date: 2006-12-01 01:25:55
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55 | Add to Reading ListSource URL: www.scielo.brLanguage: English - Date: 2003-04-07 14:28:26
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56 | Add to Reading ListSource URL: www.donaldmiller.comLanguage: English - Date: 2006-12-04 12:12:21
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