51 | Add to Reading ListSource URL: www.fig.netLanguage: English - Date: 2010-11-10 04:44:25
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52 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-11-05 11:52:45
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53 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-06-28 19:45:19
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54 | Add to Reading ListSource URL: www.bie.eduLanguage: English - Date: 2014-08-07 13:01:41
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55 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-09-25 10:37:39
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56 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-09-22 18:35:32
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57 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-09-25 09:37:48
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58 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-09-15 19:08:01
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59 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-09-15 18:29:32
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60 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-09-07 19:55:40
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