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The dinosaurs of North America . GEOLOGICAL SURVEY SIXTEENTH ANNUAL REPORT PART PL LXV TRICERATOPS PRORSUS Cretaceous Pl LXV Illustration biodiversitylibrary org title Marsh Othniel Charles NameFound Triceratops prorsus NameConfirmed Triceratops prorsus Marsh EOLID NameBankID Biodiversity Heritage Library The dinosaurs