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And Marshall Kirk McKusick wrote the latter, "The Design and Implementation of the FreeBSD Operating System"

I used this book as a primary reference for OS design (along with The Dinosaur Book) when designing my hobby OS.

The FreeBSD kernel/world is almost exquisite in it's engineering simplicity. Compared to the sometimes chaotic world of GNU/Linux (in my experience).

Thanks, pretty sure that's the one I meant.