Article date: Sep 1973
Article title: Problems on the surface of a sphere offer an entertaining introduction to point sets
Mathematical Games column? Y
Book: 11. Knotted Doughnuts and Other Mathematical Entertainments
Chapter: 12. Point Sets on the Sphere
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (1 November 2023):
I have seen this chapter and column side-by-side and they match.