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In the footsteps of history: the bees of the genus Hylaeus Fabricius (Hymenoptera, Apoidea: Colletidae) collected by V.I. Roborovsky and P.K. Kozlov in Northwest China (1895–1926)

. Zootaxa. 4434, 3 (Jun. 2018), 573–588. DOI:https://doi.org/10.11646/zootaxa.4434.3.11.