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2. Permafrost and changing climate: the Russian perspective;Anisimov;Ambio,2006
3. Workshop on environmental protection of permafrost terrain;Brown;North. Eng.,1980
4. 17 years of thaw penetration and surface settlement observations in permafrost terrain along the Norman Wells pipeline, Northwest Territories, Canada;Burgess,2003
5. Canadian landform examples-17 retrogressive thaw slumps;Burn;Can. Geogr.,1990