Bertha Loonstein was a daughter of Jacob Loonstein and Naatje Speijer. She married in Amsterdam on 28 August 1940 to Mozes Schaap (widower of Betsy Frederika Blez).
City Archive of Amsterdam, archive card of Mozes Schaap and Bertha Loonstein.
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Amsterdam, – Auschwitz,
Reached the age of 38 years
Occupation: Warehouse clerk