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Query: keyword: "geographic variation"
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| 1 | 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 | |
| 2 | Article: Geographic variation and subspecies of Corvus Enca (Horsfield, 1821) R.G.M. Oortwijn, in: Zoologische Mededelingen, Vol. 61 (1987), p. 31-51 | |
| 3 | 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 |