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Helen Fouché Gaines (October 12, 1888 – April 2, 1940) was a member of the American Cryptogram Association and editor of the book Cryptanalysis (originally Elementary Cryptanalysis) first published in 1939. The book described the principal cryptographic systems of the 19th century and cracking methods including elementary contact analysis (cryptanalysis). Her pen name was PICCOLA. Shortly after the publication of the book, she died.

• ACA history of the book from The ACA and you
• Official ACA site
• Arkansas Women’s History Institute