[maps] Warning! The maps are automatically generated from the textual information, and the process does not always produce acceptable result; See about maps for more info.
Some related literature:
[NAML]; Chamberlin & Hoffman, 1958
Checklist of the Millipeds of the North America
U.S. Nat. Mus. Bull. 212
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.