41 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:10:55
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42 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-11-08 14:08:48
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43 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-08-09 13:27:57
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44 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 12:28:00
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45 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 10:15:49
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46 | Add to Reading ListSource URL: nebraska.eduLanguage: English - Date: 2014-05-01 18:40:04
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47 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 08:55:46
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48 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-07 10:09:42
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49 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-10-31 07:59:24
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50 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-08-16 08:35:58
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