[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
New millipeds of the western States and Lower California
Journ. Washington Acad. Sci., 43 (12): 417-422, f. 1-20
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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.