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A Study of Bald Eagles Wintering Along the Mississippi River Between St. Paul and Red Wing, Min., and the St. Croix River South of Hudson, Wis., 1987-1990
其他書名
Final Report Submitted to the Minnesota Department of Natural Resources Nongame Program
出版Raptor Center at the University of Minnesota, 1991
URLhttp://books.google.com.hk/books?id=XptBiv5lnQgC&hl=&source=gbs_api