Catalogue of British Hymenoptera in the British Museum. Part 1, Andrenidae and Apidae British Museum (Natural History). Department of Zoology. creator Smith, Frederick, 1805-1879 contributor text book London Printed by order of the Trustees 1891 1891 2d ed. New issue
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ENG Bees Great Britain Hymenoptera QL568 A6 B7 1891 https://www.biodiversitylibrary.org/bibliography/20948 10.5962/bhl.title.20948 OTU