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Black Duck Distribution, Harvest Characteristics, and Survival
Aelred D. GeisRobert I. SmithJohn P. Rogers
出版U.S. Department of the Interior, Fish and Wildlife Service, Bureau of Sport Fisheries and Wildlife, 1971
URLhttp://books.google.com.hk/books?id=Q9x2Ryat8F8C&hl=&source=gbs_api
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