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Some related literature:
Blanchard & Knudson, 1983
New North American species of Eucosmini (Lepidoptera: Tortricidae)
Proc. Ent. Soc. Wash. 85 (4)
Notes on Gretchena: A new species and the synonymy of Gwendolina (Lepidoptera: Tortricidae)
Proc. Ent. Soc. Wash. 84 (3)
[NACL]; Hodges, 1983
Check List of the Lepidoptera of America North of Mexico
Check List Lep. Am. N of Mexico
A new species of Gretchena (Tortricidae) injurious to planted Neotropical walnut
J. Lep. Soc. 41 (3)
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.