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Pocock Ri,. (1909). Photographs of Burchel's and Wahlberg's Quaggas. Ann & Mag N Hist, 7, 415–419.
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Ridgeway W,. (1909). Contributions to the study of the Equidae; the differentation of the three species of zebras. Proc Zool Soc Lond, , 547–586.
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Lamarck, J. - B. (1909). Zoologische Philosophie,Mit Einleitung und Anhang: Das phylogenetische System der Tiere nach Haeckel. Leipzig: Kröner.
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