↑ "Births, Deaths & Marriages Online", [digital index], New Zealand Department of Internal Affairs (www.bdmhistoricalrecords.dia.govt.nz), Birth Registration of William Ernest Olsen, child of John and Elizabeth; citing Birth Certificate 1879/16202 .
↑ "Births, Deaths & Marriages Online", [digital index], New Zealand Department of Internal Affairs (www.bdmhistoricalrecords.dia.govt.nz), Marriage Registration of William Ernest Olsen and Gertrude Hydes ; citing Marriage Certificate 1903/4439 .
↑ "Births, Deaths & Marriages Online", [digital index], New Zealand Department of Internal Affairs (www.bdmhistoricalrecords.dia.govt.nz), Death Registration of William Ernest Olsen, aged at death 53Y; citing Death Certificate 1932/12486 .
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