| Name | Role | Place | Source | |
|---|---|---|---|---|
| Isaak Colthof | Conscript | 1866 | Militia records | |
| Isaak Colthof | Deceased | 1921 | Leeuwarden, Gorredijk | Civil registration deaths |
| Isaak Colthof | Groom | 1875 | Opsterland, Gorredijk | Civil registration marriages |
| Isaak Colthof | Relation | 1926 | Leeuwarden | Civil registration deaths |
| Isaak Colthof | Registered | 1846 | Leeuwarden | Population register |
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