61 | Add to Reading ListSource URL: www.scienceinschool.orgLanguage: English - Date: 2010-11-22 15:46:31
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62 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2014-11-12 10:34:01
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63 | Add to Reading ListSource URL: www.ohioairquality.orgLanguage: English - Date: 2003-11-17 12:37:37
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64 | Add to Reading ListSource URL: www.deq.utah.govLanguage: English - Date: 2014-09-05 15:27:32
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65 | Add to Reading ListSource URL: www.deq.utah.govLanguage: English - Date: 2014-11-20 12:49:20
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66 | Add to Reading ListSource URL: www.ima-europe.euLanguage: English - Date: 2012-10-15 06:10:14
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67 | Add to Reading ListSource URL: wvwri.orgLanguage: English - Date: 2012-05-24 14:43:55
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68 | Add to Reading ListSource URL: publications.iowa.govLanguage: English - Date: 2014-06-26 15:23:09
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69 | Add to Reading ListSource URL: www.msha.govLanguage: English - Date: 2014-07-24 09:54:43
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70 | Add to Reading ListSource URL: www.ecy.wa.govLanguage: English - Date: 2008-08-18 12:54:35
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