>>9438456I have a few Rex Comp books by Mandarake, which cover misc. keshigomu lines. Also a picture book of almost all the old Bandai gacha vending machine artwork.
Pic related is a book on indie toys I liked. It covered famous indie toy makers and their tips on how to make them. Most of the tips you could find online, but it was still pretty neat to see some behind the scenes stuff.
I've been wanting to make my own fan-made collector guide for a toy line I love. It is tough to make time for it. I really should make that a personal goal for myself in 2022.