51 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2006-04-24 16:26:54
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52 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-07-12 14:38:52
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53 | Add to Reading ListSource URL: ngmdb.usgs.govLanguage: English - Date: 2014-01-18 09:40:04
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54 | Add to Reading ListSource URL: phys.orgLanguage: English - Date: 2014-11-28 22:04:13
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55 | Add to Reading ListSource URL: www.glaciallakewisconsin.orgLanguage: English - Date: 2014-03-11 18:10:16
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56 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2001-01-09 13:58:51
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57 | Add to Reading ListSource URL: www.usc.eduLanguage: English - Date: 2003-05-10 02:02:48
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58 | Add to Reading ListSource URL: www.blm.govLanguage: English - Date: 2014-10-26 02:08:43
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59 | Add to Reading ListSource URL: www.emr.gov.yk.caLanguage: English - Date: 2014-10-15 14:43:36
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60 | Add to Reading ListSource URL: ia.water.usgs.govLanguage: English - Date: 2012-07-16 17:21:41
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