A bit off topic, but considering that many of the books I've purchased dealing with genealogy and heraldry have been many years out of print and well used at least by me others here may find this useful. Appended to the end of this post are a few links which cover in detail the steps necessary for identifying and repairing book maladies.

As a caveat, it should be noted that before attempting any of these remedies if a book is of considerable value or historically important eschew repair. Have an expert that knows the value of the book determine if repairs should be made and if so have them done by professionals. Also, if a book is important or valuable to you, then practice on other books before attempting to repair a prized tome.

From the side of common sense, follow all directions, make a dry run or two before doing anything that is non-reversible and make sure you have everything you need at hand before starting a repair.

I've repaired a few books using the steps presented in these tutorials with success. There is some satisfaction from opening a book, which had sections falling out and covers flopping about, after completion of a repair and hearing the crackle from the spine just like a new book.

I have a number of other sites, but this should provide a good start