| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gregorius Josephus De Backer | Child | 1882 | Aalst | Civil registration births |
| Gregorius-Josephus De Backer | Deceased | 1882 | Aalst | Civil registration deaths |
| Josephus Gregorius de Backer | Groom | 1939 | Amsterdam | Civil registration marriages |
| Josephus Gregorius de Backer | Registered | 1913 | Amsterdam | Pension registry |
| Josephus Gregorius de Backer | Registered | 1913 | Amsterdam | Militia records |
| Josephus Gregorius de Backer | Registered | 1913 | Amsterdam | Personal cards |
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