# Our native ferns and their allies; with synoptical descriptions of the American Pteridophyta north of Mexico

> 6th edition of Underwood's book

**Wikidata**: [Q51515725](https://www.wikidata.org/wiki/Q51515725)  
**Source**: https://4ort.xyz/entity/our-native-ferns-and-their-allies-with-synoptical-descriptions-of-the-american-pteridophyta-north-of-mexico-q51515725


## References

1. Biodiversity Heritage Library
2. Internet Archive