Article date: May 1975
Article title: On the remarkable Császár polyhedron and its applications in problem solving
Mathematical Games column? Y
Book: 12. Time Travel and Other Mathematical Bewilderments
Chapter: 11. The Császár Polyhedron
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 1975 and The Császár Polyhedron in Time Travel and Other Mathematical Bewilderments and these match.