Reply To: CALLING ALL TEACHERS (shameless self-promotion)
Contrary to popular demand ( 🙂 ) I don’t think Madness has published a printed copy of their book; these are two shorter books on the Vigenère & Substitution ciphers .
Madness: I (and probably others!) would love a print copy of your larger book.
PS: ‘unabiguous’ is a typo, Unit 160, page 521.