# Z39.50

> application layer communications protocol for searching and retrieving information from a database over a TCP/IP computer network

**Wikidata**: [Q135847](https://www.wikidata.org/wiki/Q135847)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Z39.50)  
**Source**: https://4ort.xyz/entity/z39-50


## References

1. Library of Congress Subject Headings
2. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
3. [Source](https://lingualibre.org/wiki/Q678387)
4. Freebase Data Dumps. 2013
5. Faceted Application of Subject Terminology
6. General Finnish Ontology
7. RFC 2056: Uniform Resource Locators for Z39.50
8. YSA - General Finnish Thesaurus
9. National Library of Israel
10. Wikibase TDKIV