# Universal Decimal Classification

> bibliographic and library classification system

**Wikidata**: [Q243350](https://www.wikidata.org/wiki/Q243350)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Universal_Decimal_Classification)  
**Source**: https://4ort.xyz/entity/universal-decimal-classification


## References

1. [Source](http://www.udcc.org/index.php/site/page?view=about_history)
2. [Universal Decimal Classification Number. OCLC, Inc.](https://www.oclc.org/bibformats/en/0xx/080.html)
3. Freebase Data Dumps. 2013
4. Virtual International Authority File
5. YSO-Wikidata mapping project
6. Quora