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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 western millipeds
Bull. Univ. Utah, biol. ser., 6 (5): 1-23, pls. 1-3, f. 1-30
Chamberlin & Hoffman, 1950
On some genera and families of North American diplopods
Chicago Acad. Sci. Nat. Hist. Misc. 71: 1-7, f. 1-2
Über einige amerikanische Myriapoden
Zool. Anz., 122 (11-12): 273-284, f. 1-5
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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.