# Karl Kiefer
**Wikidata**: [Q94912240](https://www.wikidata.org/wiki/Q94912240)  
**Source**: https://4ort.xyz/entity/karl-kiefer-q94912240


## References

1. Catalog of the German National Library
2. [Source](https://kalliope-verbund.info/DE-611-BF-121058)
3. CERL Thesaurus