| Name | Role | Place | Source | |
|---|---|---|---|---|
| Ruurd Elfring | Registered | 1842 | Leeuwarden | Population register |
| Ruurd Elfring | Conscript | 1898 | Militia records | |
| Ruurd Elfring | Child | 1878 | Idaarderadeel | Civil registration births |
| Ruurd Elfring | Registered | 1869 | Leeuwarden | Population register |
| Ruurd Elfring | Registered | 1878 | Leeuwarden | Population register |
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