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The dinosaurs of North America . GEOLOGICAL SURVEY SIXTEENTH ANNUAL REPORT PART PL LXIX STERRHOLOPHUS AND TRICERATOPS Cretaceous Pl LXIX Illustration biodiversitylibrary org title Marsh Othniel Charles NameFound Sterrholophus NameConfirmed Sterrholophus NameBankID Biodiversity Heritage Library The dinosaurs of North