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Library of Congress Classification System: Home

This LibGuide describes Library of Congress call numbers and how books are arranged on the shelves using this system.

LC Divisions

A GENERAL WORKS
B PHILOSOPHY. PSYCHOLOGY. RELIGION
C AUXILIARY SCIENCES OF HISTORY
D HISTORY: GENERAL AND OLD WORLD
E HISTORY: AMERICAS
F HISTORY: AMERICAS
G GEOGRAPHY. ANTHROPOLOGY. RECREATION
H SOCIAL SCIENCES
J POLITICAL SCIENCE
K LAW
L EDUCATION
M MUSIC AND BOOKS ON MUSIC
N FINE ARTS
P LANGUAGE AND LITERATURE
Q SCIENCE
R MEDICINE
S AGRICULTURE
T TECHNOLOGY
U MILITARY SCIENCE
V NAVAL SCIENCE
W Not assigned
X Not assigned
Y Not assigned
Z LIBRARY SCIENCE

Note the absence of I and O , letters that can be easily confused with numbers .

Library of Congress Classification System

The Library of Congress system is used by most college and university libraries to organize books on the library shelves.  It is an alpha-numeric system.   Each item in the library has a label with letters and numbers (together called a call number) which indicates its place on the shelf.   The letters indicate a subject area and the numbers which follow further subdivide the broader topic into more specific categories. 

Start with a search in the WorldShare search box (The box below.  Click on the Books tab)

After locating a book title, click on the links:  Availability and Editions and Formats.   You will find LC call numbers on our newer books, shelved on the main floor (2nd floor).   LC call numbers are also used to organize our textbook collection and the reference collection.

Search books, articles and more: the PCC Library Catalog

A single search box covers our catalog of books and DVDs, as well as a large number of the periodical articles in our collection. You can search All, or you can use the tabs above the search box to narrow your search to Articles or Books.

Start your search here!