# Permo-Carboniferous fresh water burrows

> Chicago: Field Museum of Natural History, 1975.

**Wikidata**: [Q51517417](https://www.wikidata.org/wiki/Q51517417)  
**Source**: https://4ort.xyz/entity/permo-carboniferous-fresh-water-burrows


## References

1. Biodiversity Heritage Library
2. Internet Archive
3. Source