# William S. O'Brien

> American banker, Mining millionaire (1825 –1878)

**Wikidata**: [Q15040623](https://www.wikidata.org/wiki/Q15040623)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/William_S._O'Brien)  
**Source**: https://4ort.xyz/entity/william-s-o-brien


## References

1. Faceted Application of Subject Terminology
2. SNAC
3. Find a Grave