11 | Add to Reading ListSource URL: www.earth-science-activities.co.ukLanguage: English - Date: 2013-08-18 13:19:36
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12 | Add to Reading ListSource URL: www.dievolkswirtschaft.chLanguage: French - Date: 2013-06-18 07:45:54
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13 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-15 15:19:16
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14 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-11-24 14:01:18
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15 | Add to Reading ListSource URL: www.earthlearningidea.comLanguage: English - Date: 2014-12-14 12:24:52
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16 | Add to Reading ListSource URL: www.lpi.usra.eduLanguage: English - Date: 2009-01-08 14:52:41
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17 | Add to Reading ListSource URL: woodshole.er.usgs.govLanguage: English - Date: 2014-02-11 16:51:42
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18 | Add to Reading ListSource URL: www.geo.uu.nlLanguage: English - Date: 2007-11-21 14:37:54
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