Article date: Jan 1969
Article title: Dr. Matrix gives his explanation of why Mr. Nixon was elected President
Mathematical Games column? Y
Book: 4. The Magic Numbers of Dr. Matrix
Chapter: 12. Fifth Avenue
This data confirmed? yes
Notes
Peter Rowlett (5 September 2022):
I have seen copies of Scientific American Jan 1969 and Fifth Avenue in The Magic Numbers of Dr. Matrix and these match.