311 | Add to Reading ListSource URL: www.deq.utah.govLanguage: English - Date: 2014-07-01 11:33:42
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312 | Add to Reading ListSource URL: www.geology.arkansas.gov- Date: 2008-08-19 23:51:11
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313 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2013-01-25 18:01:45
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314 | Add to Reading ListSource URL: www.michigan.govLanguage: English - Date: 2012-12-07 14:38:11
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315 | Add to Reading ListSource URL: www.cnsopb.ns.caLanguage: English - Date: 2014-05-29 10:32:38
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316 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-12-11 16:59:50
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317 | Add to Reading ListSource URL: www.fs.fed.usLanguage: English - Date: 2006-12-28 15:07:13
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318 | Add to Reading ListSource URL: www.cryosphericsciences.orgLanguage: English - Date: 2012-08-25 14:06:38
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319 | Add to Reading ListSource URL: www.cfa.harvard.eduLanguage: English - Date: 2013-03-12 17:42:52
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320 | Add to Reading ListSource URL: messenger-education.orgLanguage: English - Date: 2009-07-06 16:53:43
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