# Frank O. Heyder

> Baltimore municipal architect, draftsman, and book collector

**Wikidata**: [Q110463233](https://www.wikidata.org/wiki/Q110463233)  
**Source**: https://4ort.xyz/entity/frank-o-heyder


## References

1. American Architects Directory, first edition
2. [Source](https://www.baltimoresun.com/news/bs-xpm-1991-09-01-1991244090-story.html)
3. [Source](https://mht.maryland.gov/mihp/MIHPCard.aspx?MIHPNo=B-2834)
4. [Source](https://aiahistoricaldirectory.atlassian.net/wiki/spaces/AHDAA/pages/35713918/ahd1019630)
5. [archINFORM](https://www.archinform.net/service/wd_aiarch.php)