#ElizebethSmithFriedman left this world on Halloween, 1980.
Elizebeth & her husband, William, invented the science of cryptology. She worked as the chief cryptanalyst for the Coast Guard breaking codes during Prohibition; & for the Navy locating Nazi spies during #WWII. Elizebeth was a federal employee 20 years, but was always temporary.
It's only in the last decade that she is finally getting credit for her work. Her collection is at the #MarshallFoundationLibrary: https://library.marshallfoundation.org/Portal/Default/en-US/Collections/Collection/1
@b4cks4w
Also, The woman all spies fear by Amy Butler Greenfield.
https://bookshop.org/p/books/the-woman-all-spies-fear-code-breaker-elizebeth-smith-friedman-and-her-hidden-life-amy-butler-greenfield/16215121
@MelissaHDavis Best-selling (very approachable) bio:
The Woman Who Smashed Codes: A True Story of Love, Spies, and the Unlikely Heroine Who Outwitted America's Enemies
https://bookshop.org/p/books/the-woman-who-smashed-codes-a-true-story-of-love-spies-and-the-unlikely-heroine-who-outwitted-america-s-enemies-jason-fagone/15277894