Becker, Helaine. Counting on Katherine: How Katherine Johnson Saved Apollo 13. Illus. By Dow Phumiruk. 2018. 40p. Henry Holt/Christy Ottaviano Books, $17.99 (9781250137524). Gr. K-4.
Through determination, boundless curiosity and perseverance Katherine Johnson became an accomplished mathematician and played an integral role in the early space program
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