# Friedrich Müller

> Hessian-Austrian-Hungarian technician and speleologist

**Wikidata**: [Q94850231](https://www.wikidata.org/wiki/Q94850231)  
**Source**: https://4ort.xyz/entity/friedrich-m-ller-q94850231


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. [Österreichisches Biographisches Lexikon 1815–1950](https://www.biographien.ac.at/oebl/oebl_M/Mueller_Friedrich_1842_1919.xml)