# Heinrich Klassen
**Wikidata**: [Q45755822](https://www.wikidata.org/wiki/Q45755822)  
**Source**: https://4ort.xyz/entity/heinrich-klassen-q45755822


## References

1. Catalog of the German National Library
2. [Source](https://bop.unibe.ch/linguistik-online/article/view/881/1536)
3. [Source](https://katalogplus.sub.uni-hamburg.de/vufind/Record/043013678)