| Kirby, M.X.; MacFadden, B., 2005. Was southern Central America an archipelago or a peninsula in the Middle Miocene? A test using land-mammal body size. Palaeogeography, Palaeoclimatology, Palaeoecology 228: 193-202, figs 1-5, tabs 1-3.
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| MacFadden, B.J., 1992. Fossil horses: systematics, paleobiology, and evolution of the family Equidae. Cambridge, Cambridge University Press
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