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An Immature Pachyrhinosaurus perotorum (Dinosauria: Ceratopsidae) Nasal Reveals Unexpected Complexity of Craniofacial Ontogeny and Integument in Pachyrhinosaurus
- Anthony R. Fiorillo,
- Ronald S. Tykoski
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- Published: June 19, 2013
- https://doi.org/10.1371/journal.pone.0065802