DDLevel 1

DDC Main Classes

The DDC Main Classes are the ten broad categories that form the foundation of the Dewey Decimal Classification system, each covering a thousand-number range from 000 to 900. They organize all knowledge into General Works, Philosophy, Religion, Social Sciences, Language, Natural Sciences, Applied Sciences, Arts, Literature, and History & Geography, providing a hierarchical framework for more specific subclassifications.

GET/api/v1/systems/dewey_decimal/nodes/DD

Manual TranscriptionPublic Domain

Hierarchy Explorer

Hierarchy ExplorerChevron to expand - click title to open

DD.000Computer Science, Info, General

DD.100Philosophy and Psychology

DD.200Religion

DD.300Social Sciences

DD.400Language

DD.500Science

DD.600Technology

DD.700Arts and Recreation

DD.800Literature

DD.900History and Geography

Cross-system equivalences0

No cross-system equivalences mapped for this node.

Report a data issue