# Ryōichi Okamoto

> Japanese historian

**Wikidata**: [Q20039204](https://www.wikidata.org/wiki/Q20039204)  
**Source**: https://4ort.xyz/entity/ry-ichi-okamoto-q20039204


## References

1. Integrated Authority File
2. Virtual International Authority File
3. CiNii Research
4. [Web NDL Authorities](https://id.ndl.go.jp/auth/ndlna/00059758)
5. Library of Congress Authorities