Codes, ciphers, and secret writing / Lists

This edition is on 3 lists.

Spies, Code-Breaking etc
by BlueFire
36 items Last modified February 16, 2021

These books are the one related to spies. I haven't read all of them, but am looking forward to.
Books to Read
by EmilyM
15 items Last modified October 22, 2018
math
by Claire
21 items Last modified March 28, 2016

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