| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Frederik Postuma | Conscript | 1938 | Haarlem | Militia records |
| Jan Frederik Postuma | Registered | 1818 | Amsterdam | Special registers |
| Jan Frederik Postuma | Registered | 1938 | Militia records | |
| Jan Frederik Postuma | Father | 1840 | Dokkum | Civil registration births |
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