# Allen V. Heyl

> economic geologist of the U.S. Geological Survey

**Wikidata**: [Q18697311](https://www.wikidata.org/wiki/Q18697311)  
**Source**: https://4ort.xyz/entity/allen-v-heyl


## References

1. Czech National Authority Database
2. Mindat.org
3. Virtual International Authority File
4. Catalogo of the National Library of India