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Query: keyword: "geographic variation"

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 Article: Systematic notes on Asian birds. 41. Territorial songs and species-level taxonomy of nightjars of the Caprimulgus macrurus complex, with the description of a
G. Sangster, F.G. Rozendaal, in: Zoologische Verhandelingen, Vol. 350 (2004), p. 7-45
 Article: Geographic variation and taxonomy of crested newts (Triturus cristatus superspecies): morphological and mitochondrial DNA data
J.W. Arntzen, Graham P. Wallis, in: Contributions to Zoology, Vol. 68 (1999), p. 181-203
 Article: Geographic variation and subspecies of Corvus Enca (Horsfield, 1821)
R.G.M. Oortwijn, in: Zoologische Mededelingen, Vol. 61 (1987), p. 31-51
 Article: A new subspecies of Accipiter virgatus (Temminck) from Flores, Lesser Sunda Islands, Indonesia (Aves: Accipitridae)
G.F. Mees, in: Zoologische Mededelingen, Vol. 58 (1984), p. 313-321