A library card can refer to several cards traditionally used for the management of books and patrons in a library. In its most common use, a library card serves similar functions as a membership card. A person who holds a library card has borrowing or other privileges associated with the issuing library. The library card also serves as a method of identification. When a person chooses an item to borrow and presents their library card to the library, they take responsibility for the borrowed item and promise to abide by certain rules, usually including a promise to return the item by the due date or face a library fine. If the cardholder violates these responsibilities, their borrowing privileges may be suspended. As of 2011, 62% of all Americans are library cardholders.
"Library card" may also refer to the borrowing cards used to record book borrowing before the advent of computer systems. When a library book was prepared for lending, a borrowing card would be inserted into a small pocket in the front or back cover of the book. When a patron borrowed a book, their name and the book's due date would be recorded on the borrowing card, which would be filed under the patron's name or card number. The borrowing card would be replaced with a stamped due date card to inform the patron of the item's due date. The book was then released to the patron. When the book was returned, the patron's name would be crossed off the borrowing card. The borrowing card would be placed back in the book and the book would be shelved. In some libraries, this system of borrowing may still be in use.
- "Results of 1 January 2011 Harris Poll Quorum" (PDF). Harris Interactive. Retrieved 27 July 2013.
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