# E. R. Hagemann
**Wikidata**: [Q64014002](https://www.wikidata.org/wiki/Q64014002)  
**Source**: https://4ort.xyz/entity/e-r-hagemann


## References

1. Virtual International Authority File
2. Faceted Application of Subject Terminology
3. National Archives Identifier
4. NUKAT
5. Library of Congress Control Number
6. National Library of Israel Names and Subjects Authority File