Its purpose is strictly to make each title unique. The volume number. In libraries, the principal list of available materials is called a catalog. A catalog is a list of books, maps, pamphlets, coins, stamps, sound recordings, or materials in any other medium that constitute a collection. Its purpose is to record, describe, and index the holdings of a specific collection.
Catalogs are necessary whenever a collection is too large to be remembered item for item.
It may be in the form of cards, book, or computer online. Cataloging The process of describing an item in the collection, conducting subject analysis, and assigning a classification number. A cross reference for a particular subject will direct you to different subject headings. This is to suggest to you that the library has related information you may also be interested in. The Dewey Decimal Classification System is for classification of the non-fiction items.