# John O'Brien

> geologist (born 1941)

**Wikidata**: [Q112448065](https://www.wikidata.org/wiki/Q112448065)  
**Source**: https://4ort.xyz/entity/john-o-brien-q112448065


## References

1. Czech National Authority Database
2. Virtual International Authority File
3. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)