# Heinrich Ostertag
**Wikidata**: [Q94931866](https://www.wikidata.org/wiki/Q94931866)  
**Source**: https://4ort.xyz/entity/heinrich-ostertag


## References

1. Catalog of the German National Library
2. [Source](https://kalliope-verbund.info/DE-611-BF-105815)
3. Virtual International Authority File