颁布单位：[University of Alberta] |  颁布时间：1977 |  实施时间：1977 |  学科分类：[Vegetation,, Influence, of, the, Environment, on, Spruce, Pine, Trees, Spruce--Canada, Pine--Canada, Mackenzie, Delta, District, of, Mackenzie,, NW, Spruce--Ecology, Conifers, Pine--Ecology, Plants--Hardiness, Cedars]

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