661 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-01-03 10:01:22
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662 | Add to Reading ListSource URL: cegis.usgs.govLanguage: English - Date: 2010-12-23 09:19:33
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663 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2003-01-06 15:08:52
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664 | Add to Reading ListSource URL: www.kidsciencechallenge.comLanguage: English - Date: 2012-08-18 04:16:32
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665 | Add to Reading ListSource URL: edocs.nps.eduLanguage: English - Date: 2009-01-28 17:57:36
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666 | Add to Reading ListSource URL: cms.brookes.ac.ukLanguage: English - Date: 2014-01-26 12:38:10
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667 | Add to Reading ListSource URL: compeng.ulster.ac.ukLanguage: English - Date: 2013-08-13 11:32:10
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668 | Add to Reading ListSource URL: edocs.nps.eduLanguage: English - Date: 2010-10-29 15:30:08
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669 | Add to Reading ListSource URL: www.tn.govLanguage: English - Date: 2011-07-20 17:21:32
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670 | Add to Reading ListSource URL: edocs.nps.eduLanguage: English - Date: 2006-12-27 12:15:02
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