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Linda R. Berg, Mary Catherine Hager, David M. HassenzahlWiley, in collaboration with The National Geographic Societyc2011
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Siri Carpenter, Karen HuffmanWiley in collaboration with the National Geographic Societyc2010
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Linda R. Berg, Mary Catherine HagerWiley, in collaboration with the National Geographic Societyc2009
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Bruce T. Anderson, Alan StrahlerWiley, in collaboration with the National Geographic Societyc2008
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Alan Strahler with Zeeya MeraliJ. Wiley, in collaboration with the National Geographic Societyc2008
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