Aquire a physical copy of the book that you are willing to damage, and carefully dissemble the book into separate pages, trimming off glue on the edge. Then you can scan the pages into pdf format with a scanner. Make sure you get the pages in order. You can use pdf editing software to change page order or flip any that may have been accidentally misaligned in the scanner, and you can combine multiple pdfs into one book, so you can do it in shifts. I’ve only done this on a small scale, but that’s how I did it.