11 | Add to Reading ListSource URL: phys.orgLanguage: English - Date: 2014-10-28 23:46:57
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12 | Add to Reading ListSource URL: faromine.caLanguage: English - Date: 2010-08-05 16:02:28
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13 | Add to Reading ListSource URL: www.oecd.orgLanguage: English - Date: 2014-07-04 16:13:07
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14 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 12:13:42
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15 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 12:13:42
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16 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2002-05-28 13:51:00
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17 | Add to Reading ListSource URL: pebblescience.orgLanguage: English - Date: 2011-11-28 02:12:09
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18 | Add to Reading ListSource URL: www.faromine.caLanguage: English - Date: 2010-08-05 16:02:28
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19 | Add to Reading ListSource URL: execdeanagriculture.rutgers.eduLanguage: English - Date: 2005-03-14 15:58:54
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20 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 12:13:42
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