31 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2015-02-23 16:15:56
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32 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2015-02-10 16:12:32
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33 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2014-06-27 12:02:59
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34 | Add to Reading ListSource URL: upload.wikimedia.orgLanguage: English - Date: 2013-10-05 21:07:51
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35 | Add to Reading ListSource URL: www.epa.govLanguage: English - Date: 2008-05-06 14:54:37
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36 | Add to Reading ListSource URL: www.mapcruzin.comLanguage: English - Date: 2014-08-26 21:12:09
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37 | Add to Reading ListSource URL: cdn.americanprogress.orgLanguage: English - Date: 2015-02-05 11:39:41
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38 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-15 13:28:32
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39 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-18 19:30:06
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40 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-11-28 23:35:42
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