Article date: Dec 1969
Article title: A handful of combinatorial problems based on dominoes
Mathematical Games column? Y
Book: 9. Mathematical Circus
Chapter: 12. Dominoes
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 Dec 1969 and Dominoes in Mathematical Circus and these match.