Dewey Decimal Classification Home ›› Library Information ›› Dewey Decimal Classification The Library’s English-language materials are organized according to the Dewey Decimal Classification system: Call Number Range Subject Categories 000 Computer Science, Information, General Works 100 Philosophy & Psychology 200 Religion 300 Social Sciences 400 Language 500 Natural Sciences & Mathematics 600 Technology (Applied Sciences) 700 Arts & Recreation 800 Literature 900 Geography and History