11 | Add to Reading ListSource URL: www.dcnr.state.pa.us- Date: 2014-05-23 10:30:13
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12 | Add to Reading ListSource URL: co.water.usgs.govLanguage: English - Date: 2014-10-15 18:02:08
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13 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-06-10 13:15:18
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14 | Add to Reading ListSource URL: www.dcnr.state.pa.us- Date: 2014-06-09 14:23:45
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15 | Add to Reading ListSource URL: www.aspenpitkin.comLanguage: English - Date: 2012-02-29 17:15:01
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16 | Add to Reading ListSource URL: www.coloradodot.infoLanguage: English - Date: 2009-08-12 15:23:14
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17 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-09-12 00:37:14
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18 | Add to Reading ListSource URL: history.denverlibrary.orgLanguage: English - Date: 2013-06-25 13:56:04
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19 | Add to Reading ListSource URL: www.lib.utexas.eduLanguage: English - Date: 2012-05-02 14:28:15
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20 | Add to Reading ListSource URL: www.columbiaccd.orgLanguage: English - Date: 2014-05-12 09:09:53
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