| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Bontjer | Child | 1902 | Kolham | Civil registration births |
| Johan Bontjer | Groom | 1930 | Slochteren | Civil registration marriages |
| Johan Bontjer | Deceased | 1951 | Groningen | Civil registration deaths |
| Johan Bontjer | Deceased | 1951 | Groningen | Civil registration deaths |
| Johan Bontjer | Father | 1943 | Sappemeer | Civil registration deaths |
| Johan Bontjer | Registered | Sappemeer | Population register | |
| Johan Bontjer | Child | 1903 | Slochteren | Civil registration births |
| Johan Bontjer | Deceased | 1902 | Slochteren | Civil registration deaths |
| Johan Bontjer | Registered | Sappemeer | Population register |
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