# John J. Hammer

> German painter (1842-1906)

**Wikidata**: [Q22002263](https://www.wikidata.org/wiki/Q22002263)  
**Source**: https://4ort.xyz/entity/john-j-hammer


## References

1. Deutsche Biographie
2. Union List of Artist Names
3. RKDartists
4. Catalog of the German National Library
5. Virtual International Authority File
6. Athenaeum
7. Benezit Dictionary of Artists
8. Artnet
9. Artsy