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Hawks in Flight : The Flight Identification of North American Migrant… (original 1988; edition 1989)
by Clay Sutton
Hawks In Flight by Clay Sutton (1988)
References to this work on external resources.
Wikipedia in English (1)
field guide to 23 species of North American birds of prey. Annotation. Subtle characteristics allow identification of 23 species of raptor.
(summary from another edition)
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