# U-331

> 1940 Type VIIC submarine

**Wikidata**: [Q690070](https://www.wikidata.org/wiki/Q690070)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/German_submarine_U-331)  
**Source**: https://4ort.xyz/entity/u-331


## References

1. The naval war in the Atlantic (1939-1945)
2. [Source](http://www.ubootarchiv.de/ubootwiki/index.php/U_331)
3. The Submarine War, 1939-1945
4. [Source](https://uboat.net/technical/shipyards/nordsee.htm)
5. [Source](https://uboat.net/boats/u331.htm)
6. Freebase Data Dumps. 2013
7. [Source](http://www.ubootarchiv.de/ubootwiki/index.php/Hans-Diedrich_Freiherr_von_Tiesenhausen)