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http://159.226.74.248:8000/pagelinks/151367.pdf
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http://www.researchgate.net/profile/Diying_Huang/publication/240450279_First_fossil_Calopterygoidea_Odonata_Zygoptera_from_Southeastern_Asia_A_new_genus_and_species_from_the_Paleogene_of_China/links/5684ba1908aebccc4e0fec6e/First-fossil-Calopterygoidea-Odonata-Zygoptera-from-Southeastern-Asia-A-new-genus-and-species-from-the-Paleogene-of-China.pdf
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