| ▲ | dustfinger 3 hours ago | |
Title: Can You Crack the Code?: A Fascinating History of Ciphers and Cryptography ISBN-10 : 1681195143 ISBN-13 : 978-1681195148 Title: Top Secret: A Handbook of Codes, Ciphers and Secret Writing ISBN-10 : 0763629723 ISBN-13 : 978-0763629724 | ||
| ▲ | mike_richards 2 hours ago | parent [-] | |
Thanks for the recommendations, Top Secret was just recommended elsewhere so we'll check them out. | ||