The first thing people think when they hear the word library is "a place to get books." While the model of libraries and librarianship has very much been transformed in the information era, the library is still a place to discover, locate, and make use of books. Not everything is accessible with the click of a button. Print still matters.
Library of Congress Subject Headings (LCSH) are extremely useful when searching.
Look in an item's record under Subject(s).
Use these linked subjects to discover other materials classified under the same subject headings.