51 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-06 21:20:24
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52 | Add to Reading ListSource URL: www.maine.govLanguage: English - Date: 2013-10-02 08:30:22
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-02-11 16:29:38
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-02-21 16:35:38
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55 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-02-11 13:36:43
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56 | Add to Reading ListSource URL: www.geology.gov.yk.caLanguage: English - Date: 2014-06-17 12:25:21
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57 | Add to Reading ListSource URL: www.wsdot.wa.govLanguage: English - Date: 2014-08-03 05:30:45
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58 | Add to Reading ListSource URL: ruby-sapphire.comLanguage: English - Date: 2012-11-11 09:56:25
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59 | Add to Reading ListSource URL: www.ruby-sapphire.comLanguage: English - Date: 2012-11-11 09:56:25
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60 | Add to Reading ListSource URL: www.nickdoe.caLanguage: English - Date: 2011-05-08 03:21:22
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