# Willard Daniel Hartman

> U.S. spongiologist (1921-2013)

**Wikidata**: [Q21394503](https://www.wikidata.org/wiki/Q21394503)  
**Source**: https://4ort.xyz/entity/willard-daniel-hartman


## References

1. [Discovery](https://drive.google.com/file/d/1AAjTzqWJWL2gMBLN-1gD9Hkm6guYyyaH/view?usp=sharing)
2. [Source](https://archives.yale.edu/repositories/15/resources/11177)
3. [Source](https://archives.yale.edu/repositories/15/resources/11101)
4. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
5. [Source](http://hdl.handle.net/10079/fa/ypm.izar.001124)