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Ducks and Men
William G. Leitch
出版Ducks Unlimited (Canada), 1978
ISBN09192137829780919213784
URLhttp://books.google.com.hk/books?id=i3IeAQAAMAAJ&hl=&source=gbs_api
註釋History of Ducks Unlimited (Canada) published after 40 years of conservation and habitat development in Canada.