# Wald. (? Waldemar?) Olsen
**Wikidata**: [Q53505296](https://www.wikidata.org/wiki/Q53505296)  
**Source**: https://4ort.xyz/entity/wald-waldemar-olsen


## References

1. Catalog of the German National Library
2. The Stuttgart Database of Scientific Illustrators 1450–1950
3. MAK
4. Virtual International Authority File