61 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2005-06-24 10:42:48
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62 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2001-07-09 17:46:21
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63 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-11-15 12:38:02
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64 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2007-07-16 17:29:16
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65 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2005-06-24 10:28:27
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66 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2005-06-03 14:00:29
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67 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2001-07-09 17:46:20
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68 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2007-07-16 17:30:51
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69 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-11-15 12:38:02
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70 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-07-01 09:36:34
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