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Some harvest options and their consequences for the aspen, birch, and associated conifer forest types of the Lake States
North Central Forest Experiment Station (Saint Paul, Minn.).
出版Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1978
URLhttp://books.google.com.hk/books?id=SAV07GFBgyMC&hl=&source=gbs_api
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