41 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 11:42:40
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42 | Add to Reading ListSource URL: www.sciencestuff.comLanguage: English - Date: 2013-06-13 10:45:19
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43 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-11-02 11:10:14
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44 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2011-10-24 16:19:14
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45 | Add to Reading ListSource URL: wlwb.caLanguage: English - Date: 2012-10-25 13:41:18
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46 | Add to Reading ListSource URL: www.chem.unep.chLanguage: English - Date: 2010-01-12 11:41:58
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47 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-10-02 11:18:13
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48 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 11:42:40
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49 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-10-18 10:56:04
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50 | Add to Reading ListSource URL: www.nmfs.noaa.govLanguage: English - Date: 2010-05-28 14:38:00
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