To dream of a bookshelf on it’s own represents your plans for the future.
To dream of books on a shelf represents ideas, information, or insights that you have yet to discover or that you are beginning to explore. It may also reflect ideas, answers, or methods that you are waiting to try.
It may be a sign that you are looking for answers to a problems, studying something new, or that you need to acquire some information or knowledge in a situation before making decisions.
Example: A woman dreamed of her bookshelf becoming warped and separating. In waking life her marriage was coming apart along with all her future plans for the marriage.