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Library FAQ

Answers to patron questions

Library of Congress Classification

The books in the library are organized by the Library of Congress Classification. The classification system divides all knowledge into 21 broad subject areas, each identified by a letter of the alphabet. A second letter is used to subdivide into subject areas. Numbers are used to divide each subject into specific topics.  The system uses a combination of letter and/ or numbers (call numbers) to organize the books on the same topic.

Reading Call Numbers

When you search the catalog you will find the call number in blue text telling you the location of the book in the library. Call Numbers are located on the spine of the book or lower front cover.

Book Title: An African American and Latinx history of the United State

Author: Paul Ortiz

Call Number: 3rd Floor Stacks; E184.S75 O79 2018


To read a call number start with the first two lines, or first set of letters and numbers which describe the subject area of the book.

E184. S75= African American History 

The third line often represents the author's last name.

O79= Ortiz

The last line is the year of publication