The Dewey Decimal System is made up of ten main classes or categories, each divided into ten secondary classes or subcategories, each having ten subdivisions.
* 000 – Computer science, information, and general works * 100 – Philosophy and psychology * 200 – Religion * 300 – Social sciences * 400 – Languages * 500 – Science and Mathematics * 600 – Technology and applied science * 700 – Arts and recreation * 800 – Literature * 900 – History and geography and biography
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