61 | Add to Reading ListSource URL: nature.nps.govLanguage: English - Date: 1998-09-02 03:00:00
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62 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 1999-05-25 10:24:53
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63 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2010-07-02 14:39:37
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64 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2012-10-18 16:15:38
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65 | Add to Reading ListSource URL: www.dep.state.pa.usLanguage: English - Date: 2009-01-27 17:19:18
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66 | Add to Reading ListSource URL: www.chem.unep.chLanguage: English - Date: 2009-01-21 06:03:08
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67 | Add to Reading ListSource URL: www.afn.caLanguage: English - Date: 2011-06-01 14:51:56
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68 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2008-07-29 13:15:26
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69 | Add to Reading ListSource URL: www.hawaiidentalwellness.comLanguage: English - Date: 2014-09-11 14:00:02
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70 | Add to Reading ListSource URL: health.mo.govLanguage: English - Date: 2009-03-13 12:56:22
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