311 | Add to Reading ListSource URL: www.mngs.umn.eduLanguage: English - Date: 2003-09-25 11:57:26
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312 | Add to Reading ListSource URL: www.d.umn.eduLanguage: English - Date: 2008-01-31 10:23:11
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313 | Add to Reading ListSource URL: www.eeescience.utoledo.eduLanguage: English - Date: 2011-08-31 14:44:23
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314 | Add to Reading ListSource URL: www.geology.wisc.eduLanguage: English - Date: 2006-06-23 11:41:15
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315 | Add to Reading ListSource URL: pdfhost.focus.nps.govLanguage: English - Date: 2008-03-18 03:10:48
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316 | Add to Reading ListSource URL: pdfhost.focus.nps.govLanguage: English - Date: 2008-03-18 03:10:48
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317 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-31 15:02:25
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318 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2005-01-12 10:44:16
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319 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2007-01-17 14:17:03
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320 | Add to Reading ListSource URL: files.dnr.state.mn.usLanguage: English - Date: 2009-09-29 09:02:03
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