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The Development of the Chondrocranium of Melopsittacus Undulatus (Advances in Anatomy, Embryology and Cell Biology, Vol 104)
The Development of the Chondrocranium of Melopsittacus Undulatus (Advances in Anatomy, Embryology and Cell Biology, Vol 104)
By Johannes M. Dekock

BSAVA manual of psittacine birds
By Peter H. Beynon,Neil A. Forbes