Sophia de Leeuw was a daughter of Hendrik de Leeuw and Emillia Kan. She is buried in Diemen.
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Sophia Viskoop- de Leeuw committed suicide in camp Westerbork.
Oorlogsarchief Nederlandse Rode Kruis (War archives of the Dutch Red Cross), Coll. Westerbork, nr. 298
Sophia Viskoop-de Leeuw was cremated in Westerbork transit camp. The urn with her ashes was placed on the Jewish cemetry in Diemen on field U, row 9, grave nr. 26.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork, opgenomen in het archief van de gemeente Midden-Drenthe te Beilen, inv. n 3789