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Card catalogs are needed in order to ensure an organized and easy to use library. Consequently, there are three types of card catalogs, and these are the following:
1. Title Card – the card that indicates the title of a book or an article in the first line.
2. Author Card – the card that indicates the name of the author or authors in the first line.
3. Subject Card – the card that indicates the non-fiction subject of the book.