| Name | Role | Place | Source | |
|---|---|---|---|---|
| Dirk Adolf Posthuma | Child | 1906 | Den Helder | Civil registration births |
| Dirk Adolf Posthuma | Registered | 1906 | Amsterdam | Overgenomen delen |
| Dirk Adolf Posthuma | Registered | 1906 | Amsterdam | Militia records |
| Dirk Adolf Posthuma | Groom | 1938 | Amsterdam, Den Helder | Civil registration marriages |
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