# Carl Heyel
**Wikidata**: [Q55949718](https://www.wikidata.org/wiki/Q55949718)  
**Source**: https://4ort.xyz/entity/carl-heyel


## References

1. Integrated Authority File
2. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
3. NUKAT
4. datos.bne.es
5. IdRef
6. CONOR.SI
7. Faceted Application of Subject Terminology
8. Catalogo of the National Library of India