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In 1931, two Iowa State College professors, Professor Lester Yoder and Dr. B. H. Thomas, began research on a project of the Agricultural Experiment Station. The project concerned vitamins. Now, after twenty-two years of extensive research, study and experimenting, the two men revealed a new compound which they term "Vitamin 607."
The Iowa Homemaker: Vol. 32
, Article 7.
Available at: https://lib.dr.iastate.edu/homemaker/vol32/iss7/7