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National Cipher Challenge 2019 › Forums › National Cipher Challenge 2019: Countdown to Catastrophe › Book Recommendation
Harry I would like to make a Book Recommendation
THE MAMMOTH BOOK OF SECRET CODE PUZZLES
OVER 600 MYSTERY CODES TO BE CRACKED
UK VERSION: ISBN 1845293258
Go here for full details: https://www.elonka.com/mammoth/
On Amazon: https://www.amazon.co.uk/Books-Elonka-Dunin/s?rh=n%3A266239%2Cp_27%3AElonka+Dunin
She has another book due later this year that may be worth considering:
Codebreaking & Cryptograms: A Practical Guide
by Elonka Dunin and Klaus Schmeh | 16 Jul 2020
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