41 | Add to Reading ListSource URL: duketox.mc.duke.eduLanguage: English - Date: 2003-07-15 15:38:25
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42 | Add to Reading ListSource URL: www.nature.comLanguage: English - Date: 2010-01-15 07:42:38
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43 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2007-12-12 07:01:55
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44 | Add to Reading ListSource URL: www.proceedings-stfandicard-2009.comLanguage: English - Date: 2009-05-20 08:19:00
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45 | Add to Reading ListSource URL: www.wqa.orgLanguage: English - Date: 2014-05-08 10:38:28
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46 | Add to Reading ListSource URL: nature.nps.govLanguage: English - Date: 1998-09-02 03:00:00
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47 | Add to Reading ListSource URL: npic.orst.eduLanguage: English - Date: 2014-07-01 14:17:54
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48 | Add to Reading ListSource URL: www.magnabon.comLanguage: English - Date: 2012-06-11 11:18:25
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49 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-07-13 16:55:03
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50 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-15 12:35:50
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