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‎Sybren Clases de Boer‏‎ Married/ Related to: ‎Dutje Sipkes Dijkstra‏‎ Child: 1. ‎Jan Sybrens de Boer‏‎ Born ‎10 Feb 1873 Witmarsum, died ‎3 Oct 1943 Witmarsum‎, age 70 years