The Homologies of the Stylar Cusps in the Upper Molars of the Didelphyidae [microform]
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![The Homologies of the Stylar Cusps in the Upper Molars of the Didelphyidae [microform]](https://m.media-amazon.com/images/I/51EPiwYduOL._SL75_.jpg "The Homologies of the Stylar Cusps in the Upper Molars of the Didelphyidae [microform]")