Betje Waas joined the Hollandia-Kattenburg textile factory in Amsterdam on 8 July 1941. On Wednesday, 11 November 1942, around 4:30 PM, Willy Lages conducted the Sicherheitspolizei raid on the Hollandia factories. All exits were blocked and the Jewish staff members were taken away that evening. Photographs of all workers taken away that evening, as well as those deported previously, appear in the 'Boek der tranen' [Book of tears].

Source: Jewish Historical Museum, Documents collection, inv.nr B1376, 'Boek der tranen' [Book of tears]