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S Tuhkanen, A circumpolar system of climatic-phytogeographical regions, 1984; Acta Botanica Fennica 127, 50pp.; L Häm et-Ahti, Subdivision of the boreal zone, Fennia 159:1 69-75, 1981; Atlas Arktiki USSR 1985 - 114-121; Atlas Mira: USSR 1964; 66-67DCW 1996-8 (digital charts of the world); CAFF Habitat Conservation Report no. 5. This map has been first published in CAFF 2001, Arctic Flora and Fauna, Status and Conservation. Adapted from a map by Seppo Kaitlala and Juhana Nieminen (University of Helsinki).