# Rudolf Frey
**Wikidata**: [Q95261741](https://www.wikidata.org/wiki/Q95261741)  
**Source**: https://4ort.xyz/entity/rudolf-frey-q95261741


## References

1. [Source](https://gateway-bayern.de/BV020202285)
2. Catalog of the German National Library
3. [Source](http://kalliope-verbund.info/DE-611-HS-309742)
4. [Source](http://kalliope-verbund.info/DE-611-HS-3576074)