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Some related literature:
[NAML]; Chamberlin & Hoffman, 1958
Checklist of the Millipeds of the North America
U.S. Nat. Mus. Bull. 212
New American millipeds
Bull. Univ. Utah, biol. ser., 6 (4): 1-39, pls. 1-5, f. 1-49
Three new genera and eight new species of western millipeds
Chicago Acad. Sci. Nat. Hist. Misc., 68: 1-6, f. 1-3
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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.