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File:Pachycephalosaurus skull.png

English: The holotype adult skull of Pachycephalosaurus "reinheimeri" (DMNS 469).
Polski: Czaszka holotypu Pachycephalosaurus "reinheimeri" (osobnik dorosły, DMNS 469).
Date 27 October 2009
Source Horner JR, Goodwin MB (2009) Extreme Cranial Ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus. PLoS ONE 4(10): e7626. doi: 10.1371/journal.pone.0007626.g006
Author John R. Horner, Mark B. Goodwin
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