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Cold weather movements of waterfowl in Western Europe : a report undertaken by the Wildfowl and Wetlands Trust, Slimbridge under the supervision of Dr Myrfyn Owen, to the International Waterfowl and Wetlands Research Bureau

A. D. FoxS. C. Ridgill

出版	International Waterfowl and Wetlands Research Bureau, 1990
URL	http://books.google.com.hk/books?id=dXq0oAEACAAJ&hl=&source=gbs_api