Article date: May 1958
Article title: About tetraflexagons and tetraflexagation
Mathematical Games column? Y
Book: 2. More Mathematical Puzzles and Diversions
Chapter: 2. Tetraflexagons
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (26 October 2023):
I have seen this chapter and column side-by-side and they match.