| Name | Role | Place | Source | |
|---|---|---|---|---|
| Isidore Declercq | Witness | 1883 | Brussel | Civil registration marriages |
| Isidore Declercq | Witness | 1891 | Sint-Jans-Molenbeek | Civil registration marriages |
| Isidore Declercq | Witness | 1879 | Sint-Jans-Molenbeek | Civil registration marriages |
| Isidore Declercq | Deceased | 1845 | Mons | Civil registration deaths |
| Isidore Declercq | Witness | 1865 | Brussel | Civil registration marriages |
| Isidore Declercq | Witness | 1891 | Koekelberg | Civil registration marriages |
| Isidore Declercq | Deceased | 1837 | Mons | Civil registration deaths |
| Isidore François Declercq | Child | 1867 | Brugge | Civil registration births |
| Jules Isidore Cornil Declercq | Deceased | 1991 | Montivilliers | Civil registration deaths |
| Jules Isidore Cornil Declercq | Deceased | 1991 | Montivilliers | Civil registration deaths |
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