Books are a great source for background information, big themes, and analysis of a large topic. They are not such a great option for up-to-date statistics or cutting edge research because of the amount of time they take to publish.
If you find a book that looks like it might be useful, look at the table of contents and index and try to find the topic keywords you identified. If you can't find your keywords, the book is probably not going to be helpful for your research. If the keywords are in certain chapters, you can identify which sections you'll need to read instead of wasting your time on the whole book.
In the library catalog, you will find everything the library owns—print books, ebooks, DVDs, streaming audio, microfiche, and more.