HBW and Birdlife International illustrated checklist of the birds of the world : Volume 1: Non-passerines : Texts based on the initial contributions from the authors of the Handbook of the Birds of the World, volumes 1-7 and Special Volume Josep del Hoyo, Nigel J. Collar ; with David A. Christie, Andrew Elliot, Lincoln D. C. Fishpool ; colour plates by Richard Allen u.a.

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