# Robert Siegfried Nagel
**Wikidata**: [Q21033845](https://www.wikidata.org/wiki/Q21033845)  
**Source**: https://4ort.xyz/entity/robert-siegfried-nagel


## References

1. Czech National Authority Database
2. [Source](https://www.geschichtewiki.wien.gv.at/index.php?curid=14978)
3. Virtual International Authority File
4. CONOR.SI