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Understanding Call Numbers

Books are shelved alphabetically by call number.

Call numbers starting with:*
  • A - BV are on the 3rd Floor
  • BX - MT, P - TP, and TS - Z are on the 4th Floor
  • N and TR are on the 2nd Floor

*Books selected for Recreational Reading are on the 2nd Floor.


Lemieux Library uses the Library of Congress (LC) system to catalog items. This means that all call numbers begin with a letter that represents the subject of the book. If you are looking for a subject area to browse instead of a specific item, click here to learn the subject disciplines and their locations.

Search the Library's catalog to find an item's call number:

In Catalog On Spine How to Read Each Line*
QL337.U35N4 1971B
Uganda quest: African wildlife after dark
Neal, Ernest G.
1 copies available at LEMIEUX in ONSHELF
QL Alphabetically
337 Numerically
.U35 Letter - alphabetically; Number - as a decimal
N4
1971 This is extra info that includes: dates, issue numbers, copy numbers, etc. These are read after the call number.
B

*Call numbers vary in length; some aren't larger than the first line, in which case just read the lines that are there.

Q QL QS

The first line of a call number lists 1 - 3 letters. These should be read alphabetically. Single letters come before doubles, and so on. For example, you would find QL filed after Q but before QS.


QL
264
QL
337
QL
337.7
The second line is read in numerical order.

QL
337
.T2
QL
337
.U35
QL
337
.U41
In the third line, the letter is read alphabetically first. The number after it is treated as a decimal.

QL
337
.U35
N399
QL
337
.U35
N4
QL
337
.U35
N66
The fourth line is treated the same as the third.
Note: Even if there is no decimal point, this line is still read as stated.

QL
337
.U35
N4
1968
QL
337
.U35
N4
1971
A
QL
337
.U35
N4
1971
B
Some call numbers include the year the item was published, the volume number, the copy number, etc. These are all arranged in ascending order.

Browsing a Subject Area

QL337.U35N4 1971B
Uganda quest: African wildlife after dark
Neal, Ernest G.
1 copies available at LEMIEUX in ONSHELF

The beginning letters of a call number represent the subject of the item. The first letter stands for a general subject, and if there are other letters following, those indicate the subject branch.

Below is a listing of all the general subjects represented:

A General Works M Music
B Philosophy, Psychology, Religion N Fine Arts
C History of Civilization P Languages & Literature
D Foreign History & Topography Q Science
E American History R Medicine
F Local American, Latin American History S Agriculture
G Geography, Anthropology, Recreation T Technology
H Social Sciences U Military Science
J Political Science V Naval Science
K Law Z Bibliography, Library Science
L Education    

Adding another letter makes the classification more specific:

Q Science
QA Mathematics QK Botany
QB Astronomy QL Zoology
QC Physics QM Human Anatomy
QD Chemistry QP Physiology
QE Geology QR Microbiology
QH Natural History    

The sample call number QL337.U35N4 1971B shows that this book has to do with Zoology. Where are the subject areas?

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