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Gregory, W.K.; Cook, H.J. 1928. New material for the study of evolution: a series of primitive rhinoceros skulls (Trigonias) from the Lower Oligocene of Colorado. Proceedings of the Denver Museum of Natural History 8 (1): 3-32.

New material for the study of evolution: a series of primitive rhinoceros skulls (Trigonias) from the Lower Oligocene of Colorado

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Location America Subject Taxonomy Species Fossil Rhinos
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