What is the Purpose of Call Numbers and Where Do They Appear?
Each book in the library has a unique call number. A call number is a "code" that tells you:
- What the book is about
- Where it is located in the library
- When it was published
A call number puts books on the same subject together in the same place! A handy feature, as opposed to placing all green books together, or all thin books together.... ;)
Call numbers appear

(Normally call numbers appear on the spine of the book, however in very thin books, they appear on the upper left front of the book cover.)
Note that the same call number can be written from top-to-bottom, or left-to-right.
The LSU Library uses Library of Congress Classification for call numbers. This system uses a combination of letters and numbers to arrange materials by subjects.
(Thanks to Jennifer S. at Milner Library, Illinois State University, for permission to use portions of their LibGuide!)
What Do Those Letters and Numbers Mean??
The Library of Congress Classification (LCC) system arranges materials by subject. The first sections of the call number represent the subject. The letter-and-decimal section of the call number often represents the author's last name. The last section of a call number is often the date of publication.
example:
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Title: The guide to learning and study skills:
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(Thanks to Jennifer S. at Milner Library, Illinois State University, for permission to use portions of their LibGuide!)



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