Gegevens nazaten Egbert Derks en Maria van Keijsteren
veld 2: Archief Aad Edelbroek veld 2: en Jan Derks uit Veghel veld 1: Gegevens van Bert Derks uit Wanroij veld 1: in kartonnen dossiermap G11 / Derks-v. Keijsteren February 2008
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