UDC: Summary of classification

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## Outline of the UDC

The following outline is not framed in the actual terms used in the tables of any specific edition of the UDC. It is simply a guide to the arrangement of disciplines and subdisciplines, expressed in the most commonly used terms.

UDC contains over 56 000 Main numbers and over 13 000 Common auxiliaries . See also subject coverage statistics in the UDC MRF 2004 and UDC Summary with approximately 400 divisions.

### Main numbers

0 | GENERALITIES
1 | PHILOSOPHY. PSYCHOLOGY
2 | RELIGION. THEOLOGY
3 | SOCIAL SCIENCES
4 | VACANT
5 | NATURAL SCIENCES
6 | TECHNOLOGY
7 | THE ARTS
8 | LANGUAGE. LINGUISTICS. LITERATURE
9 | GEOGRAPHY. BIOGRAPHY. HISTORY

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