Article date: May 1969
Article title: The rambling random walk and its gambling equivalent
Mathematical Games column? Y
Book: 9. Mathematical Circus
Chapter: 6. Random Walks and Gambling
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (2 September 2022):
I have seen copies of Scientific American May 1969 and Random Walks and Gambling in Mathematical Circus and these match.