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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
A new Parajulus from British Columbia
Canadian Ent., 51: 119-120, f. 21
New genera and species of North American Pariulidae
Bull. Univ. Utah, biol. ser., 5 (7): 1-39, pls. 1-8, f. 1-73
New American millipeds
Bull. Univ. Utah, biol. ser., 6 (4): 1-39, pls. 1-5, f. 1-49
Descriptions of new species of North American Julidae
Proc. Acad. Nat. Sci. Philad. 16
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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.