51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 14:10:32
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-11-03 09:02:47
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53 | Add to Reading ListSource URL: www.anr.state.vt.usLanguage: English - Date: 2011-08-17 14:58:33
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54 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2014-07-10 14:38:22
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55 | Add to Reading ListSource URL: www.bl.ukLanguage: English - Date: 2014-07-20 20:22:17
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56 | Add to Reading ListSource URL: incredibleindia.orgLanguage: English - Date: 2013-05-15 00:56:40
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57 | Add to Reading ListSource URL: www.texasstonedesigns.comLanguage: English - Date: 2009-06-01 10:54:53
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58 | Add to Reading ListSource URL: www.dukelabs.comLanguage: English - Date: 2010-10-15 12:13:11
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59 | Add to Reading ListSource URL: dmg-raj.orgLanguage: English - Date: 2008-02-29 13:14:50
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60 | Add to Reading ListSource URL: www.ucl.ac.ukLanguage: English - Date: 2012-02-03 10:25:31
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