51 | Add to Reading ListSource URL: www.sdapcd.orgLanguage: English - Date: 2013-09-11 17:28:40
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52 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-11-13 07:51:05
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53 | Add to Reading ListSource URL: www.ars.usda.govLanguage: English - Date: 2001-07-30 10:01:56
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54 | Add to Reading ListSource URL: orosha.orgLanguage: English - Date: 2014-10-27 02:53:58
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55 | Add to Reading ListSource URL: www.dot.state.mn.usLanguage: English - Date: 2008-05-05 14:35:29
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56 | Add to Reading ListSource URL: npic.orst.eduLanguage: English - Date: 2014-09-11 12:05:17
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57 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 1997-11-13 07:51:00
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58 | Add to Reading ListSource URL: www.cbs.state.or.usLanguage: English - Date: 2014-10-28 02:54:26
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59 | Add to Reading ListSource URL: www.graylingindustries.comLanguage: English - Date: 2011-06-02 13:53:43
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60 | Add to Reading ListSource URL: minerals.er.usgs.govLanguage: English - Date: 2011-04-25 14:43:33
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