31 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2004-09-14 10:06:44
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32 | Add to Reading ListSource URL: www.lic.wisc.eduLanguage: English - Date: 2013-03-15 12:33:13
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33 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2003-02-26 16:01:44
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34 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-03-04 17:52:56
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35 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2008-01-22 16:48:39
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36 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2006-03-23 14:37:54
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37 | Add to Reading ListSource URL: digital.library.okstate.eduLanguage: English - Date: 2009-01-09 17:02:23
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38 | Add to Reading ListSource URL: www.economics.gov.nl.caLanguage: English - Date: 2014-03-27 13:20:36
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39 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2007-09-13 14:13:30
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40 | Add to Reading ListSource URL: www.empr.gov.bc.caLanguage: English - Date: 2014-01-22 17:31:04
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