51 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-05-29 16:32:47
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52 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2013-12-26 11:58:09
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53 | Add to Reading ListSource URL: www.bcbc.comLanguage: English - Date: 2012-07-31 20:12:11
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54 | Add to Reading ListSource URL: water.epa.govLanguage: English - Date: 2012-11-09 09:45:59
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55 | Add to Reading ListSource URL: ibm.gov.inLanguage: English - Date: 2013-07-09 07:51:00
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56 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2005-11-08 11:46:03
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57 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2014-05-29 16:32:47
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58 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2013-12-26 11:58:09
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59 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2013-08-29 16:13:51
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60 | Add to Reading ListSource URL: www.consrv.ca.govLanguage: English - Date: 2014-07-31 15:00:27
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