Addition

Rosette Koetser

Rosette was director of the Riënts-Balt school for machine writing and stenography between 1913 and 1920 (Source: Delpher, e.g. https://resolver.kb.nl/resolve?urn=MMATR05:000613001:00319)
She has also contributed to the weekly magazine De Hollandsche Lelie (Rosette Koetser - auteur - DBNL).

Source: StadsherstelAmsterdam