Helen Fouché Gaines was a member of the
External links
* [http://www.und.nodak.edu/org/crypto/crypto/.chap01.html ACA history of the book from "The ACA and you"]
* [http://www.cryptogram.org Official ACA site]
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Análisis de frecuencias — Saltar a navegación, búsqueda Frecuencia de las letras en un texto inglés … Wikipedia Español
