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Subject headings are standardized descriptions that indicate what a book is about.
Having a standard list makes subject headings more useful. Sometimes the title of a book clearly indicates its subject. Even if the titles do not have the same terms, the books on this subject will have the same subject heading. Sometimes, a book's title might not say much about the book's subject, so the subject headings that the catalogers assign add a lot of information. The subject headings tell you something about what the book is about, as well as giving you leads for finding more books on those topics.