51 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2002-05-28 13:51:00
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52 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-07-15 10:54:46
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53 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2014-04-04 11:19:52
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54 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-08-26 12:47:00
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55 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-08-26 12:47:00
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56 | Add to Reading ListSource URL: kbocc.orgLanguage: English - Date: 2012-05-12 14:18:58
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57 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 16:55:41
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58 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2009-10-13 14:20:09
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59 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2009-12-11 13:32:27
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60 | Add to Reading ListSource URL: www.gpo.govLanguage: English - Date: 2011-03-08 14:18:34
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