Buy one of those auto feeder scanners, cut the book's headband/hinge and you end up with all the loose papers ready to be scanned. Then let the machine do the rest. This of course requires you to cut the book, but once done, you got a pdf version which will last forever. Most automatic feeders won't do double side scanning, but a lot of models outthere can do it if you spend like an extra 100$ on it. Alternatively, you can take the book to a printing shop which can do it for a fee.