This is the pre-publication draft of entry to be published in the International Encyclopedia of Geography: People, the Earth, Environment, and Technology, made available with the permission of the publishers. Please cited published version.
Copyright © 2016 by John Wiley & Sons, All rights reserved.
in Richardson D, Castree N, Goodchild M, Kobayashi A, Liu W (eds.), (2016), The International Encyclopedia of Geography: People, the Earth, Environment, and Technology
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