I recently discovered a vast ebook library containing all kinds of interesting information… over 2,600 files. It is hosted by The Project Avalon Forum, which states on its home page:
Project Avalon, originally established by Bill Ryan and Kerry Cassidy from Project Camelot in August 2008, is essentially a high-quality information and inspiration portal. It follows a similar mission to that of the original Project Camelot when it was launched in 2006, noting that while Project Camelot was all about alerting people to the massive and significant problems we face on this planet, the focus of Project Avalon is all about providing solutions. I (Bill Ryan), supported by many others, will make available the best information and inspiration that I can access or provide.
The main website is here: https://www.projectavalon.net/
The ebook section is here: https://avalonlibrary.net/ebooks/
Just in case something happens to their site, here is a BIG mirror file of the ebook section archived in a zip: https://www.gregwyatt.net/wp-content/uploads/2022/07/Project_Avalon_Ebooks_as_of_2022-07-01.zip (22GB)