I think the first thing you should do is scan your entire book if you don't want to lose it. If some scans are hard to see, then you can programmatically enhance image. After all the scans are ready, you can find a professional who will bind you a new book on new paper from these materials that you have prepared. It is easier and cheaper than restoring an old book.
rproffitt commented: This is doubleplusgood. +16