David Ahl places all his classic computing publications into the Public Domain
https://blog.adafruit.com/2022/06/16/david-ahl-places-all-his-classic-computing-publications-into-the-public-domain/ (https://blog.adafruit.com/2022/06/16/david-ahl-places-all-his-classic-computing-publications-into-the-public-domain/)