Help for a student project on calculator algorithms

[Leviset]

The book you need is "Algorithms for RPN calculators" by John A Ball.
Hard to track down either in print or PDF - I've been looking for a copy for a couple of years.
There's one on Amazon at the moment - £35 + postage - ridiculous.
The HPCC has one in its library - as a member I requested to borrow it from the librarian over a year ago but nothing ever materialised.
If you do find a PDF please send me a copy!