Article date: Apr 1976
Article title: Snarks, Boojums and other conjectures related to the four-color-map theorem
Mathematical Games column? Y
Book: 15. The Last Recreations: Hydras, Eggs, and Other Mathematical Mystifications
Chapter: 23. Trivalent Graphs, Snarks, and Boojums
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (5 November 2023):
I have seen this chapter and column side-by-side and they match.