51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-10-23 07:10:42
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2011-07-08 11:00:25
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-07-30 08:07:13
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-05-28 13:44:04
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55 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-09-10 13:58:46
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56 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-11-14 10:06:07
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57 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-04-11 11:41:12
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58 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-11-01 11:53:57
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59 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-11-01 15:25:56
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60 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2001-05-07 13:42:41
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