Eleazar Samuel Boas was a son of Samuel Benedictus Boas and Aaltje Salomon Cohen. He married Sippora de Casseres in 1882 in Tiel.
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Eleazar Samuel Boas died on 29 September 1943 in Westerbork transit camp and he was cremated on 4 October 1943. The urn with his ashes was placed on the Jewish cemetry in Diemen on field U, row 12, grave nr. 22.
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