# J.A. Koopmans
**Wikidata**: [Q109650816](https://www.wikidata.org/wiki/Q109650816)  
**Source**: https://4ort.xyz/entity/j-a-koopmans


## References

1. [Source](https://www.dbnl.org/tekst/molh003nieu10_01/molh003nieu10_01_0707.php)
2. [Source](https://www.collectiegelderland.nl/object/7b52f070-6a0a-5bc8-9da2-436ec4848b70)
3. CollectieGelderland