# Upper Cretaceous

> volume 6 (in two parts) of the book series Maryland geological survey

**Wikidata**: [Q51432458](https://www.wikidata.org/wiki/Q51432458)  
**Source**: https://4ort.xyz/entity/upper-cretaceous


## References

1. WorldCat
2. Classify
3. Biodiversity Heritage Library
4. [Source](https://www.si.edu/object/siris_sil_359086)
5. SUDOC
6. [Library of Congress Online Catalog](https://lccn.loc.gov/gs16000510)
7. CiNii Research