41 | Add to Reading ListSource URL: www.earthlearningidea.comLanguage: English - Date: 2014-11-18 07:36:39
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42 | Add to Reading ListSource URL: phys.orgLanguage: English - Date: 2015-03-04 03:22:45
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43 | Add to Reading ListSource URL: www.geodesy.miami.eduLanguage: English - Date: 2013-05-31 16:00:56
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44 | Add to Reading ListSource URL: www.geodesy.miami.eduLanguage: English - Date: 2013-09-18 17:09:26
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45 | Add to Reading ListSource URL: www.geodesy.miami.eduLanguage: English - Date: 2007-05-23 15:31:12
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46 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2011-01-21 01:51:42
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47 | Add to Reading ListSource URL: magazines.scholastic.comLanguage: English - Date: 2015-01-15 16:30:09
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48 | Add to Reading ListSource URL: junior.scholastic.comLanguage: English - Date: 2014-12-18 15:27:06
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49 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2015-01-23 15:30:43
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50 | Add to Reading ListSource URL: agu.confex.comLanguage: English - Date: 2014-12-12 17:14:43
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