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Query: keyword: "geographical variation"

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 Article: A systematic revision of the piscivorous haplochromine Cichlidae (Pisces: Teleostei) of Lake Victoria (East Africa). Part I
M.J.P. van Oijen, in: Zoologische Verhandelingen, Vol. 272 (1991), p. 1-95
 Article: The subspecies of Chlidonias hybridus (Pallas), their breeding distribution and migrations
G.F. Mees, in: Zoologische Verhandelingen, Vol. 157 (1977), p. 3-64