| National Geographic Complete Birds of the World by Jonathan Alderfer | |
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| Norman, Eric Pasquet, Jon Fjeldsa 2008 Explosive avian radiations and multi-directional dispersal across Wallacea: Evidence from the Campephagidae and other Crown Corvida Aves | on the Internet Bird Collection• Molecular Phylogenetics and Evolution 47:221—236• Ericson, Les Christidis, Rauri C |
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