Dewey Decimal Classification

http://en.wikipedia.org/wiki/Dewey_Decimal_Classification

000 – Computer science, information & general works
100 – Philosophy and psychology
200 – Religion
300 – Social sciences
400 – Language
500 – Science (including mathematics)
600 – Technology/Applied Science
700 – Arts and recreation
800 – Literature
900 – History, geography, and biography

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