English: Illustration of the holotype skull of Monoclonius dawsoni, now synonymized with Centrosaurus apertus.
Date
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Original publication: Lambe, L. (1902). "On Vertebrata of the Mid-Cretaceous of the North West Territory". Contributions to Canadian palæontology3(4): p. 2
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{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Illustration of the holotype skull of ''Monoclonius dawsoni'', now synonymized with ''Centrosaurus apertus''.}} |Source = '''Original publication''': Lambe, L. (1902). "On Vert...