41 | Add to Reading ListSource URL: pubs.usgs.gov- Date: 2001-08-30 08:55:38
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42 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 1998-04-29 03:00:00
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43 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2013-03-18 15:33:43
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44 | Add to Reading ListSource URL: www.idwr.idaho.gov- Date: 2006-11-22 11:03:29
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45 | Add to Reading ListSource URL: www.nevadamining.orgLanguage: English - Date: 2014-01-13 19:26:41
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46 | Add to Reading ListSource URL: www2.gnb.caLanguage: French - Date: 2014-01-28 18:14:14
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47 | Add to Reading ListSource URL: www.hou.usra.eduLanguage: English - Date: 2014-04-24 15:39:15
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48 | Add to Reading ListSource URL: www2.gnb.caLanguage: English - Date: 2014-01-23 10:33:57
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49 | Add to Reading ListSource URL: archive.li.suu.eduLanguage: English - Date: 2010-09-09 14:15:13
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50 | Add to Reading ListSource URL: www.miketaylor.org.ukLanguage: English - Date: 2012-07-17 07:21:54
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