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Naturalists--Colorado and Atrichops+hesperius and research+notes by Cockerell%2C+Theodore+D.+A.+%28Theodore+Dru+Alison%29%2C+1866-1948%2C+author of Florissant+Fossil+Beds+National+Monument+%28Colo.%29 and Florissant+Fossil+Beds+National+Monument+%28Colo.%29 and Florissant+Fossil+Beds+National+Monument+%28Colo.%29
- UC Boulder