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Atrichops+hesperius and Naturalists--Colorado and Paleontology--Colorado--Teller+County by Cockerell%2C+Theodore+D.+A.+%28Theodore+Dru+Alison%29%2C+1866-1948%2C+author and Cockerell%2C+Theodore+D.+A.+%28Theodore+Dru+Alison%29%2C+1866-1948%2C+author from Undated
- UC Boulder