| Name | Role | Place | Source | |
|---|---|---|---|---|
| Klaas Gerrit van Leeuwen | Registered | 's-Gravenhage | Roll of honor | |
| Klaas Gerrit van Leeuwen | Groom | 1933 | Velsen | Civil registration marriages |
| Klaas Gerrit van Leeuwen | Father | 1948 | Deventer | Civil registration deaths |
| Klaas Gerrit van Leeuwen | Registered | 1904 | Amsterdam | Population register |
| Klaas Gerrit van Leeuwen | Registered | 1904 | Amsterdam | Militia records |
| Klaas Gerrit van Leeuwen | Registered | 's-Gravenhage, Amsterdam | Individual Files |
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