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Animalia | Arthropoda | Insecta | Diptera | Nemestrinidae and research notes and Hirmoneura psilotes and Naturalists--Colorado and Paleontology--Colorado--Teller County and Animalia | Arthropoda | Insecta | Diptera | Nemestrinidae 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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