In 2014 I wrote an unofficial eBook about Planet Core Productions, the label, the artists, etc.
I did a revised edition first in 2021, and I did another one now, and fixed some errors and did some minor changes.

It is also published on archive.org now, where you can read it online, or download it.

https://archive.org/details/pcp-legends-in-their-life-the-unofficial-planet-core-productions-book/