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Animalia | Arthropoda | Insecta | Diptera | Athericidae and Atrichops hesperius and Naturalists--Colorado and Paleontology--Colorado--Teller County and Animalia | Arthropoda | Insecta | Diptera | Athericidae and Animalia | Arthropoda | Insecta | Diptera | Athericidae and research notes by Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948, author and Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948, author
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