11 | Add to Reading ListSource URL: earthquake.usgs.govLanguage: English - Date: 2014-07-22 20:56:27
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12 | Add to Reading ListSource URL: neutrons.ornl.govLanguage: English - Date: 2009-07-27 14:00:23
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13 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2010-04-06 10:24:01
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14 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-03-06 09:33:06
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15 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2000-10-31 08:06:15
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16 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-04-06 10:24:01
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17 | Add to Reading ListSource URL: www.imwa.infoLanguage: English - Date: 2013-07-13 05:44:50
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18 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-01-13 10:44:06
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19 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 11:03:42
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20 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-01-18 14:35:57
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