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In page Ruth C. McGuire:

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McGuire started work at the United States Department of Agriculture. She retired with the title of Associate Cytologist. She did not stop working after retirement. She served as a research associate at the California Academy of Sciences from 1931 until 1942.[citation needed] While there, she studied the relationships between birds and insects. She also studied sugarcane, sugarbeets, bees, silkworms, beetles and mosquitoes. McGuire was a member of the Botanical Society of Washington, the Entomological Society of America, and the International Society of Sugar Cane Technologists.[1]