颁布单位：[University of Alberta] |  颁布时间：1973 |  实施时间：1973 |  学科分类：[Mackenzie, Delta, Permafrost,, Disturbance, by, Engineering, Works, Permafrost,, Effects, of, Thawing, on, Engineering, Works, District, of, Mackenzie,, NW, Permafrost, Northwest, Territories, Frozen, Ground]

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颁布单位：[University of Alberta] |  颁布时间：1973 |  实施时间：1973 |  学科分类：[Permafrost, Engineering, Engineering, in, Frozen, Ground, Frozen, Ground,, Structure, Frozen, Ground,, Composition, Permafrost,, Composition, Canada, Permafrost,, Structure]

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