# Pieter Jan Kaiser

> Ph.D. Universiteit Leiden 1862 (1838–1916)

**Wikidata**: [Q102311993](https://www.wikidata.org/wiki/Q102311993)  
**Source**: https://4ort.xyz/entity/pieter-jan-kaiser


## References

1. [Source](https://www.openarchieven.nl/elo%253A21ce9aad-9cf3-500b-028f-31a66ca4d3d0)
2. Mathematics Genealogy Project
3. [Source](https://n2t.net/ark:/33862/collect/516059)
4. Repertorium van Nederlandse kaartmakers