Regenerative Soil by Matt Powers, Nigel Palmers Regenerative growers guide to garden ammendments, Any Sepp Holzer book you can get yur hands on.
Discussion
I like Matt powers' videos. Sepp is great too I have a couple of his books
I have been doing his course of that book and the microscope one. The book itself is also excellent not the cheapest book, but it's massive and well worth the money for the knowledge in it. If you get it from him it's on sale atm. https://www.thepermaculturestudent.com/shop/