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Checklist of the millipeds of North and Middle America
By Richard L. Hoffman
Virginia Museum of Natural History Special Publications, 1999
Cite: 852302 with citation markup [cite:852302]
Hoffman, R. (1999). Checklist of the millipeds of North and Middle America. Virginia Museum of Natural History Special Publications 8, 1–553.

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A modern annotated checklist of millipede species known from North and Central America, including United States, Canada, Mexico,
Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panama, and the West Indies.

This extremely useful referen
This extremely useful reference can be downloaded from the Field Museum's website here. It's the Hoffman 1999b citation.