In the library catalog, you can search for books in multiple ways, including using a keyword, an author, a subject, and a title. All of these will produce different results in a library’s catalog.
If you have found a book you want to use, you might also want to look at its call number. Books on the same subject will have a similar number so that they can be put on the shelf next to each other. For example, the majority of books about Environmental Justice in the United States will start with the call number GE 230.