# Paridae, Sittidae und Certhiidae

> book (1903) by C. E. Hellmayr, vol. 18 of the series "Das Tierreich"

**Wikidata**: [Q51386228](https://www.wikidata.org/wiki/Q51386228)  
**Source**: https://4ort.xyz/entity/paridae-sittidae-und-certhiidae


## References

1. Biodiversity Heritage Library
2. Internet Archive