The Book of Aquarius by Anonymous
The Book of Aquarius by Anonymous main site is no longer available (http://thebookofanonymous.com), which was active for a few years with a forum to ask questions. The forum was closed for comments then the site domain became available.
Below are two versions of the book in English describing how to make the Philosophers Stone.
Below taken from https://www.globalgreyebooks.com/book-of-aquarius-ebook.html which has other great free ebooks to download as long as site stays online.
Description
Does the Philosophers Stone exist? This book says it does. Not only that, but it tells you how to make one. A very informal book, the writer goes into great detail on the Philosophers Stone throughout history, the religious references, famous alchemists, and instructions on how to make the stone yourself.
This book has 250 pages in the PDF version, and was originally published in 2011.
Production notes: This ebook of The Book of Aquarius was published by Global Grey in 2018.