# Heinrich Ludwigs
**Wikidata**: [Q94945291](https://www.wikidata.org/wiki/Q94945291)  
**Source**: https://4ort.xyz/entity/heinrich-ludwigs


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. archINFORM
4. [archINFORM](https://www.archinform.net/service/wd_aiarch.php)