Dewey Decimal Classification

The Dewey Decimal Classification System divides knowledge into 10 broad areas represented by the hundreds digit:

000 Computer science, information, & general works
100 Philosophy & psychology
200 Religion
300 Social sciences
400 Language
500 Science
600 Technology
700 Arts & recreation
800 Literature
900 History & geography

 

Each branch is divided into more specific topics represented by the tens and ones digits.

For example, the book Butterflies and Moths: A Kaleidoscope of Living Color has the call number 595.78:

500 Science
590 Animals (Zoology)
595 Arthropods
595.7 Insects
595.78 Butterflies and moths

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