# Heimo J. Keller
**Wikidata**: [Q131575683](https://www.wikidata.org/wiki/Q131575683)  
**Source**: https://4ort.xyz/entity/heimo-j-keller


## References

1. Catalog of the German National Library
2. NUKAT
3. Electronic Union Catalogue of Latvian Libraries of National Significance
4. Trove