Author: Hooijer, D.A., 1974.:
Title: Hipparions from the Late Miocene and Pliocene of Northwestern Kenya.
Description: [Zool. Verh. Rijksmus. Nat. Hist., 134.] Leiden: E.J. Brill. Pp. 34, 8 pls. of photos, 2 figs., 10 tabs., refs. Orig. wrs.

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