Article date: unknown-12
Article title: No corresponding article
Mathematical Games column? N
Book: 13. Penrose Tiles to Trapdoor Ciphers
Chapter: 14. Trapdoor Ciphers II
This data confirmed? yes
Notes
Peter Rowlett (6 September 2022):
Book first published 1989. No other dates given on copyright page, but presumably the articles aren't all from 1989.
Peter Rowlett (5 November 2023):
I have assigned all but one Mathematical Games column to a book chapter, and I have four other articles by Martin Gardner in Scientific American which do no correspond to chapters. I have inspected this chapter in reference to these five articles and there is no match. I conclude this was not originally a Scientific American column.