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Stephen, W. P. (1954). A revision of the genus Colletes in America North of Mexico (Hymenoptera, Colletidae). University of Kansas, Entomology.

Part 1 (150-248)
Part 2 (249-348)
Part 3 (349-448)
Part 4 (449-527)
Index, figures, and maps. (502-527)

cite:1839384
https://archive.org/details/cbarchive_100353_arevisionofthebeegenuscolletes1902