# Tõnu Martma

> Estonian geologist (born 1955)

**Wikidata**: [Q56980547](https://www.wikidata.org/wiki/Q56980547)  
**Source**: https://4ort.xyz/entity/t-nu-martma


## References

1. [Source](https://orcid.org/0000-0001-5894-7692)
2. Estonian Research Portal
3. [ORCID Public Data File 2020](https://pub.orcid.org/v3.0_rc1/0000-0001-5894-7692/external-identifiers/1285201)