A great link to download opensource books. You can get many Psi; Magick, or any other books you might find on Amazon for free. You can even find many out of print books to build your library:
Yeah, I had lost like 95% of my occult library, which took years to accumulate because the hard drive I had it on died. Anyway, I've been furiously downloading Eastern cultivation & Western Magick books I used to own.
Here are a couple other opensource resources:)
https://theoccult.click/main.php