61 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2000-11-09 11:17:22
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62 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-09-17 08:25:51
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63 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:08
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64 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:09
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65 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:08
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66 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-05-12 16:42:12
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67 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:09
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68 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:08
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69 | Add to Reading ListSource URL: www.epa.gov- Date: 2006-01-06 15:32:54
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70 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1998-02-26 07:49:17
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