# Karl Hopfgartner
**Wikidata**: [Q60623913](https://www.wikidata.org/wiki/Q60623913)  
**Source**: https://4ort.xyz/entity/karl-hopfgartner


## References

1. Österreichisches Biographisches Lexikon 1815–1950
2. Integrated Authority File
3. Catalog of the German National Library
4. [Source](https://www.biographien.ac.at/oebl/oebl_H/Hopfgartner_Karl_1868_1921.xml)