# David A. John

> Research Geologist with the USGS

**Wikidata**: [Q57604342](https://www.wikidata.org/wiki/Q57604342)  
**Source**: https://4ort.xyz/entity/david-a-john


## References

1. Czech National Authority Database
2. LinkedIn
3. [Source](https://searchworks.stanford.edu/view/787353)
4. [Source](https://orcid.org/0000-0001-7977-9106)
5. Virtual International Authority File
6. [Source](http://orcid.org/0000-0001-7977-9106)
7. [ORCID Public Data File 2020](https://pub.orcid.org/v3.0_rc1/0000-0001-7977-9106/external-identifiers/1520642)