# Olaf Niklas Hammar

> botanist (1821-1875)

**Wikidata**: [Q21514596](https://www.wikidata.org/wiki/Q21514596)  
**Source**: https://4ort.xyz/entity/olaf-niklas-hammar


## References

1. Virtual International Authority File
2. International Plant Names Index
3. author citation in botany and mycology
4. Harvard Index of Botanists
5. CERL Thesaurus
6. NUKAT