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Fur Seal Investigations, Pribilof Islands, Alaska, 1963
Alton Y. RoppelAncel M. JohnsonDouglas George Chapman
出版U.S. Department of Interior, Fish and Wildlife Service, 1965
URLhttp://books.google.com.hk/books?id=Vvv3ftoxTdsC&hl=&source=gbs_api
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