Article date: Feb 1976
Article title: Some elegant brick-packing problems, and a new order-7 perfect magic cube
Mathematical Games column? Y
Book: 12. Time Travel and Other Mathematical Bewilderments
Chapter: 18. Block Packing
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (2 November 2023):
I have seen this chapter and column side-by-side and they match.