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Feeding Ecology of the Diving Ducks Pochard (Aythya Ferina), Tufted Duck (A. Fuligula), Scaup (A. Marila) and Goldeneye (Bucephala Clangula) Overwintering on Lough Neagh, Northern Ireland

I. J. (Ian) Winfield

出版	1994
URL	http://books.google.com.hk/books?id=HQSyXwAACAAJ&hl=&source=gbs_api