This book, "Paradigms of Artificial Intelligence Programming", was first published in 1992. The rights reverted to the author, Peter Norvig, who decided to share it under the MIT license; it's open source, but not public domain.
There's a collaborative effort to dust it off, fix it up, and bring it online. We're working on this in public, together, at our Github repo, https://github.com/norvig/paip-lisp . Look for updates and newer versions there. You can send in corrections and issues there, or email them to [email protected] with "attn: PAIP correction" in the subject line.
This is a snapshot of the text in the Github repo as of 2022-04-09.
This is a work in progress.
Copyright 2022.