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Species, Age, and Sex Identification of Ducks Using Wing Plumage

Samuel M. Carney

出版	U.S. Department of the Interior, U.S. Fish and Wildlife Service, 1992
URL	http://books.google.com.hk/books?id=cJwrDCRrXmQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

“This publication contains procedures used by the U.S. Fish and Wildlife Service to determine the species, sex and age composition of the harvest of North American ducks using detached wings contributed by hunters. “