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Finding Items

A guide to the classification in the Library

The Dewey Decimal System

All the books in the Library have been given a shelfrmark number, you can find this number on the books spine. This number is mostly made of up of a number and some letters.
The numbers are part of the Dewey Decimal Classification and we use it for a few reasons
  • Subject: the Dewey Decimal Number lets you know what subject the book is about. It means all the books on the same subject will have the same number, and books on a similar subject will be close together. So if your are looking for a maths books, all the other maths books will be nearby.
  • Catalogue:  When you search for a book using the catalogue, you will be told the items shelfmark, so that you can find it on the shelves.
How does the Dewey Decimal System work?
 
The first three numbers refer to the broad subject area, and are shelved in numerical order. For example, 945 is shelved before 946.
These numbers are followed by a decimal point. The numbers after the decimal point show the sub-section of the subject area. Again, they are shelved in numerical order. For example, 945.805 is shelved before 945.81.
The numbers will be followed by three letters, these are useful when there are lots of books on the same subject. They might tell you about the book's author, its title or the level of the subject they are about.
You can see the main subject areas below
001-099 Computer science, information and general work
100-199 Philosophy and psychology
200-299 Religion
300-399 Social sciences
400-499 Language
500-599 Science
600-699 Technology
700-799 Art and recreation
800-899 Literature
900-999 History and geography
Use the subject index to find out which Dewey Decimal number is used for the subject you want to find books for.
A Dewey number explained
 
The more numbers involved in a Dewey Number give more detail on the subject
For instance the book Artist's Drawing Techniques has shelfmark 741.2/ART
This is worked out like this
7 41.2 The 700s are  for books on Art and Recreation
741.2 The 740s  are for books on Design and Related Arts
741.2 741  is for books on Drawing
741.2
 
741.2 is for books on Drawing Techniques