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Aerial Surveys of Endangered Whales in the Beaufort Sea, Fall 1989

Stephen D. Treacy

出版	U.S. Department of the Interior, Minerals Management Service, Alaska OCS Region, 1990
URL	http://books.google.com.hk/books?id=S0Ae95yJTxsC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN