| Name | Role | Place | Source | |
|---|---|---|---|---|
| Harm Jan Boxma | Child | 1901 | Assen | Civil registration births |
| Harm Jan Boxma | Groom | 1934 | Amsterdam, Assen | Civil registration marriages |
| Harm Jan Boxma | Registered | 1901 | Assen | Population register |
| Harm Jan Boxma | Registered | 21-9-1 | Assen | Population register |
| Harm Jan Boxma | Registered | 1913 | 's-Gravenhage | Population register |
| Harm Jan Boxma | Registered | 1901 | Assen | Population register |
| Harm Jan Boxma | Registered | 1901 | Amsterdam | Personal cards |
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