11 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-04-22 10:58:32
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12 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2011-11-21 14:38:39
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13 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2002-09-26 13:38:03
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14 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 11:50:03
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15 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 11:50:03
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16 | Add to Reading ListSource URL: www.serc.si.eduLanguage: English - Date: 2006-06-05 08:37:13
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17 | Add to Reading ListSource URL: epa.govLanguage: English - Date: 2012-04-04 11:50:03
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18 | Add to Reading ListSource URL: water.epa.govLanguage: English - Date: 2011-09-10 15:21:32
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19 | Add to Reading ListSource URL: ntl.bts.govLanguage: English - Date: 2012-06-27 16:40:05
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20 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-04-04 11:50:03
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