# Sonja Haller
**Wikidata**: [Q125493432](https://www.wikidata.org/wiki/Q125493432)  
**Source**: https://4ort.xyz/entity/sonja-haller


## References

1. [Source](https://www.monsterkamer.nl/author/hallerbrun/)
2. [Source](https://www.postzegelontwerpen.nl/postzegels/ontwerpen/haller-sonja)
3. [Source](https://www.railwaystamps.online/pdf/iconen-vd-post/Nederland_in_de_Bosatlas.pdf)