11 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-05-25 16:09:00
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12 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-04-22 10:58:32
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13 | Add to Reading ListSource URL: www.dnr.maryland.govLanguage: English - Date: 2014-07-28 16:58:06
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14 | Add to Reading ListSource URL: dnr.state.il.us- Date: 2013-06-20 10:44:58
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15 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2012-01-11 16:15:43
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16 | Add to Reading ListSource URL: www.wsdot.wa.govLanguage: English - Date: 2014-10-08 12:32:39
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17 | Add to Reading ListSource URL: yosemite.epa.govLanguage: English - Date: 2013-08-30 17:06:23
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18 | Add to Reading ListSource URL: owpubauthor.epa.govLanguage: English - Date: 2014-07-09 16:13:20
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19 | Add to Reading ListSource URL: agr.wa.govLanguage: English - Date: 2009-01-29 19:11:14
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20 | Add to Reading ListSource URL: www.dnr.state.il.us- Date: 2013-06-20 10:44:58
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