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Animalia | Arthropoda | Insecta | Diptera | Athericidae and Atrichops hesperius and Naturalists--Colorado 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
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