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Factors that Should be Considered in Determining Techniques for Sexing and Aging the Southern White-tailed Ptarmigan

其他書名	Lagopus Leucurus Altipetens
出版	Colorado Department of Natural Resources, Division of Game, Fish and Parks, 1956
URL	http://books.google.com.hk/books?id=Y1_GzgEACAAJ&hl=&source=gbs_api