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Keywords from Image Description:
The Ceratopsia . GEOLOGICAL SURVEY MONOGRAPH XLIX PLATE XV TRCERATOPS PRORSUS Marsh Plate XV Illustration biodiversitylibrary org title Hatcher Lull Richard Swann Marsh Othniel Charles Osborn Henry Fairfield Biodiversity Heritage Library The Ceratopsia Ceratopsia Smithsonian Institution Libraries bhl page dc identifier