Look into "diy book scanner". if the book doesn't exist at all on the internet, then anything is better than nothing. just manually scan all 300 pages with a cheap scanner. I've read books that were just manually scanned in by indian dudes with their thumbs in the frame. thanks bros. or just figure out how to stitch a bunch of jpgs from your phone together into some compressed 1-bpp pdf file would probably be the modern way to do that. Once you get the raw scans out there dedicated anons can run OCR scripts to extract the raw .txt so they can make the file very small if deisred.