# Alexander Helmut Otto Hagentorn
**Wikidata**: [Q55089730](https://www.wikidata.org/wiki/Q55089730)  
**Source**: https://4ort.xyz/entity/alexander-helmut-otto-hagentorn


## References

1. Geni
2. Catalog of the German National Library
3. Baltisches biografisches Lexikon digital
4. Alvin
5. [Source](https://www.geni.com/people/Alexander-Helmut-Otto-Hagentorn/6000000168164152002)