# Hendrik Petrus Berlage

> Dutch astronomer

**Wikidata**: [Q21552924](https://www.wikidata.org/wiki/Q21552924)  
**Source**: https://4ort.xyz/entity/hendrik-petrus-berlage-q21552924


## References

1. Catalogus Professorum Academiae Rheno-Traiectinae
2. Mathematics Genealogy Project
3. [Source](https://hetutrechtsarchief.nl/collectie/609C5B9B2DB04642E0534701000A17FD)
4. [Source](https://www.nationaalarchief.nl/onderzoeken/archief/2.02.32/invnr/890ED.10/file/00010931.PDF?)
5. Virtual International Authority File
6. Biografisch Portaal
7. KNAW Past Members