11 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2003-02-14 10:53:38
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12 | Add to Reading ListSource URL: ag.udel.eduLanguage: English - Date: 2007-12-11 15:33:05
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13 | Add to Reading ListSource URL: sec.nv.govLanguage: English - Date: 2009-04-03 18:49:01
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14 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-07-09 17:13:29
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15 | Add to Reading ListSource URL: chesapeake.usgs.govLanguage: English - Date: 2013-01-17 08:44:49
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16 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2004-11-16 14:52:51
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17 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-07-09 17:11:10
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18 | Add to Reading ListSource URL: www.usgs.govLanguage: English - Date: 2006-03-13 16:07:12
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19 | Add to Reading ListSource URL: acwi.govLanguage: English - Date: 2008-09-17 17:04:11
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20 | Add to Reading ListSource URL: water.usgs.govLanguage: English - Date: 2010-07-27 09:10:30
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