51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-01-29 14:40:34
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 09:52:22
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53 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 10:19:53
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54 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-03-24 10:35:38
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55 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-01-29 11:10:29
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56 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 13:32:54
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57 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-01-24 11:02:49
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58 | Add to Reading ListSource URL: www.atsdr.cdc.govLanguage: English - Date: 2011-11-10 16:22:49
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59 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-08-31 10:55:39
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60 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2005-10-25 10:16:31
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