Degen, E. - IX. Ecdysis, as Morphological Evidence of the Original Tetradactyle Feathering of the Bird's Fore-Limb, based especially on the perennial moult in Gymnorhina tibicen.

London: Zoological Society, 1903. Pp. 82, 3 full page plates. Full black bonded leather, folio. Trans. Zool. Soc. Lond., vol. 16, part 8, no. 1. Near fine..

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