| Name | Role | Place | Source | |
|---|---|---|---|---|
| Koob Postma | Registered | Apeldoorn | Population register | |
| Koob Postma | Groom | 1931 | Aardenburg | Civil registration marriages |
| Koob Postma | Registered | 1880 | Population register | |
| Koob Postma | Registered | 1903 | Amsterdam | Militia records |
| Koob Postma | Registered | 1903 | Zaandam, Amsterdam | Population register |
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