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Library

The Library of Congress Classification System

Libraries use classification systems to organize the books on the shelves. A classification system uses letters and/or numbers (call numbers) to arrange the books so that books on the same topic are together. This arrangement assists in “subject browsing:” you find one book in the catalog, go to the shelf, and an even better book is sitting right next to it.

Anatomy of a Call Number

Book Title: Uncensored War: The Media and Vietnam
Author: Daniel C. Hallin
Call Number: DS559.46 .H35 1986

The first two lines describe the subject of the book (e.g. DS559.45 = Vietnamese Conflict)

The third line often represents the author’s last name (e.g. H = Hallin)

The last line represents the date of publication.

Tips for Finding Books

Read call numbers line by line.

LB
Read the first line in alphabetical order: A, B, BF, C, D... L, LA, LB, LC, M, ML...
2395
Read the second line as a whole number: 1, 2, 3, 45, 100, 101, 1000, 2000, 2430...
.C65
The third line is a combination of a letter and numbers. Read the letter alphabetically. Read the number as a decimal (e.g. .C65 = .65. .C724 = .724). Some call numbers have more than one combination letter-number line.
1991
The last line is the year the book was published. Read in chronological order: 1985, 1991, 1992...

Example Bookshelf

example bookshelf showing call numbers

 



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