Permafrost and ground ice conditions of northwestern Canada [cartographic material] / compiled by J.A. Heginbottom and L. K. Radburn, 1987 ; geological cartography by J. D. Narraway. = Conditions relatives au pergélisol et à la glace de sol du nord-ouest du Canada / compilation par J.A. Heginbottom et L. K. Radburn, 1987. Raster Massachusetts Institute of Technology Public content

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