The anatomy of the honey bee / Snodgrass, R. E. (Robert E.), 1875-1962 creator text book Washington : Government Printing Office, 1910. 1910
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ENG Anatomy Bees QL568.A6S67; .A31 no.18, pt.2 United States. Dept. of Agriculture. Bureau of Entomology. Technical series ;, no. 18. https://www.biodiversitylibrary.org/bibliography/55101 5150417 10.5962/bhl.title.55101 U.S. Dept. of Agric. Library