Have you ever wondered how library books are assigned their places on the shelves? Did you know that the call number (the number placed on the spine of the book) is a code which provides valuable information about the book?


What are call numbers for? Each book in the library has a unique call number. A call number is like an address: it tells you where the book is located in the library.


Reading Call Numbers



Putting Call Numbers in Shelf Order

To understand how call numbers are put in order in Library of Congress Classification, again look at each section of the call number.

call numbers

What does the call number mean? Remember that Library of Congress Classification arranges materials by subjects. The first sections of the call number represent the subject of the book. The letter-and-decimal section of the call number often represents the author's last name. And, as you recall, the last section of a call number is often the date of publication.


Why is this important to know? Because books are classified by subject, you can often find several helpful books on the same shelf, or nearby. For example, within the same call number LB2395, there are other guides for college study.

Since Library of Congress Classification arranges materials by subjects, knowing the letters for your subject area gives you a place to start browsing the shelves. Which letters represent your subject? User can view it in Classification of Library Collection and Symbol of Collection.

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Last Updated: 09 July 2020