# Gerhardus Hendricus Koopman

> Dutch opera manager (1885–1934)

**Wikidata**: [Q124288847](https://www.wikidata.org/wiki/Q124288847)  
**Source**: https://4ort.xyz/entity/gerhardus-hendricus-koopman


## References

1. [Source](https://www.openarchieven.nl/saa:3bbd9597-9505-4b9a-a20a-310c905e1999)
2. [Source](https://archief.amsterdam/inventarissen/scans/5009/4.3.14.18/start/40/limit/10/highlight/4)
3. [Stadsarchief Amsterdam](https://www.openarchieven.nl/saa:3bbd9597-9505-4b9a-a20a-310c905e1999)
4. [Stadsarchief Amsterdam](https://archief.amsterdam/inventarissen/scans/5009/4.3.14.18/start/40/limit/10/highlight/4)