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Library Catalog Tutorial

How to Read a Library of Congress Call Number

Each book, video and CD has a unique call number. Think of the call number as an address that tells you where an item is in the library.

Call numbers can begin with one to three letters which indicate the item's broad subject area.

Example:

H=Social Sciences
N=Art
Q=Science

The subsequent lines consist of numbers and a combination of letters and numbers. 

The first line should be read alphabetically.

Q QA QH

The second line should be read numerically.

LB
5
LB
41
LB
1507

The third line should be read alphabetically first, then the number should be read as a decimal.

BF
891
.B833
BF
891
.B84
BF
891
.S548

Sometimes a call number will have a fourth line. If that line is alphanumeric like the third line, read it the same way.

TK
5105.875
.I57
I557
TK
5105.875
.I57
I568
TK
5105.875
.I57
I58

Any additional lines that indicate a date, volume number, copy number or other annotations should be read logically. If it is a year, read it chronologically. If it is a volume number, read it numerically, etc.

As always, if you have any questions, please come to the Reference Desk and ask

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