51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-11 12:09:16
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-02-15 08:18:32
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-09-06 08:58:46
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-03-06 12:21:10
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55 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1998-02-24 11:24:13
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56 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-10-12 17:01:27
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57 | Add to Reading ListSource URL: hatfield-memorial-lecture.group.shef.ac.ukLanguage: English - Date: 2007-03-20 07:33:09
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58 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 14:48:43
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59 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2001-02-01 13:50:52
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60 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2010-01-27 10:20:12
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