# Carl Sumner Knopf
**Wikidata**: [Q85847696](https://www.wikidata.org/wiki/Q85847696)  
**Source**: https://4ort.xyz/entity/carl-sumner-knopf


## References

1. [Source](http://catalogo.pusc.it/auth/122027)
2. Faceted Application of Subject Terminology
3. Biodiversity Heritage Library