41 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-05-03 11:31:34
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42 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-07-29 08:53:46
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43 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-11-26 10:02:00
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44 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-12-09 15:38:46
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45 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-04-24 10:01:49
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46 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-07-11 08:38:43
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47 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-10-30 07:50:52
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48 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-03-14 16:18:17
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49 | Add to Reading ListSource URL: www.lbma.org.ukLanguage: English - Date: 2014-03-28 07:50:31
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50 | Add to Reading ListSource URL: www.lbma.org.ukLanguage: English - Date: 2013-07-17 11:50:46
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