# Jan Kowalewski

> Officer of the Polish Army, cryptographer (1892–1965)

**Wikidata**: [Q2028475](https://www.wikidata.org/wiki/Q2028475)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Jan_Kowalewski)  
**Source**: https://4ort.xyz/entity/jan-kowalewski


## References

1. Catalog of the German National Library
2. Virtual International Authority File
3. Internetowy Polski Słownik Biograficzny
4. Freebase Data Dumps. 2013
5. Sejm-Wielki.pl