Article date: Jan 1965
Article title: Some comments by Dr. Matrix on symmetries and reversals
Mathematical Games column? Y
Book: 4. The Magic Numbers of Dr. Matrix
Chapter: 6. Miami Beach
This data confirmed? yes
Notes
Peter Rowlett (5 September 2022):
Peter Rowlett initial guess (Very uncertain)
Peter Rowlett (29 October 2023):
I have seen this chapter and column side-by-side and they match. Part of the opening of this column is from a note at the end of the October 1964 column.