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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
On some genera and species of American millipeds
Bull. Univ. Utah, biol. ser., 8 (2): 1-20, f. 1-42
The cambaloid millipeds of the United States, including a family new to the fauna and new genera and species
Proc. U.S. Nat. Mus., 86 (3043): 27-66, f. 10-21, pl. 2
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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.