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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
Some records and descriptions of diplopods ciefly in the collection of the Academy
Proc. Acad. Nat. Sci. Philadelphia, 99: 21-58, f. 1-73
On some western millipeds of the order Spirobolida
J. Wash. Acad. Sci. 39 (5)
Myriopoda of northwestern North America
in Harriman Alaska Expedition, 8 (Insects pt. 1): 47-82, pls. 3-5
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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.