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worldcat.org
Simpson, George Gaylord. (1967). The Beginning of the Age of Mammals in South America.. Part 2 Systematics : Notoungulata, concluded (Typotheria, Hegetotheria, Toxodonta, Notoungulata incertae sedis) ; Astrapotheria ; Trigonostylopoidea ; Pyrotheria ; Xenungulata ; Mammalia incertae sedis. OCLC251765832. Consultado el 4 de agosto de 2020.