Article date: Jan 1966
Article title: Dr. Matrix returns, now in the guise of a neo-Freudian psychonumeranalyst
Mathematical Games column? Y
Book: 4. The Magic Numbers of Dr. Matrix
Chapter: 7. Philadelphia
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.