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Age and Sex Composition of Ducks and Geese Bagged in the 1997 Hunting Season in Comparison with Prior Years

Paul I. Padding

出版	United States Fish and Wildlife Service, Office of Migratory Bird Management, 1998
URL	http://books.google.com.hk/books?id=2WqNwAEACAAJ&hl=&source=gbs_api