# Leopold Dreher
**Wikidata**: [Q20480276](https://www.wikidata.org/wiki/Q20480276)  
**Source**: https://4ort.xyz/entity/leopold-dreher


## References

1. [Source](http://www.plansprachen.ch/Esperanto_Polen.pdf)
2. Czech National Authority Database
3. Virtual International Authority File
4. Integrated Authority File
5. [Source](https://polona.pl/item/kompletny-podrecznik-jezyka-esperanto-dla-poczatkujacych,OTY0NjQ1NTk/4/#info:metadata)
6. AustriaN Newspapers Online