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Petronio, C. (1995): Note on the taxonomy of Pleistocene hippopotamuses. Ibex3: 53-55. PDF fulltextArchiválva2008. szeptember 12-i dátummal a Wayback Machine-ben
Petronio, C. (1995): Note on the taxonomy of Pleistocene hippopotamuses. Ibex3: 53-55. PDF fulltextArchiválva2008. szeptember 12-i dátummal a Wayback Machine-ben