And here's some interesting background info on the late John Allen which I just stumbled upon:

John Allen (1937-2022) and Anatomy of LISP https://mcjones.org/dustydecks/archives/2024/04/11/1249/

And it's worth pointing out here that the book itself is now freely available: https://dl.acm.org/doi/book/10.5555/542865

Maybe I’m missing something, but that webpage only seems to provide a PDF containing the beginning of the book (up through the Preface). Perhaps you need a ACM Digital Library Premium subscription to access the entire book?

Sigh -- they keep changing the rules. I think you have to have a free ACM account. If you send me an email (see my home page in my profile), I'll send you a PDF.

I appreciate your offer, but there’s no need. I subsequently found a copy here:

https://softwarepreservation.computerhistory.org/LISP/book/A...

excellent. Also cool that Allen wrote TCL Lisp.