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WikiPedia: Ibun abadi http://cenperm.ku.dk/ http://permafrost.gi.alaska.edu/ http://adsabs.harvard.edu/abs/2007GeoRL..34.9503D http://adsabs.harvard.edu/abs/2009GBioC..23.2023T http://www.lter.uaf.edu/dev2009/pdf/1350_Tarnocai_... http://pubs.usgs.gov/pp/p1386a/gallery5-fig04b.htm... http://water.usgs.gov/edu/earthwherewater.html http://www.the-cryosphere.net/9/479/2015/tc-9-479-... http://web.archive.org/web/20111211215133/http://i... http://ipa.arcticportal.org/resources/what-is-perm...