| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johannes Lambertus Hendricus van Leeuwen | Father | 1920 | Groningen | Civil registration births |
| Johannes Lambertus Hendricus van Leeuwen | Registered | 1886 | Amsterdam | Population register |
| Johannes Lambertus Hendricus van Leeuwen | Registered | 1886 | Amsterdam | Police reports |
| Johannes Lambertus Hendricus van Leeuwen | Registered | 1886 | Amsterdam | Police reports |
| Johannes Lambertus Hendricus van Leeuwen | Groom | 1910 | Groningen | Civil registration marriages |
| Johannes Lambertus Hendricus van Leeuwen | Registered | 1886 | Amsterdam | Militia records |
| Johannes Lambertus Hendricus van Leeuwen | Father | 1911 | Groningen | Civil registration births |
| Johannes Lambertus Hendricus van Leeuwen | Registered | 's-Gravenhage, Amsterdam | CABR dossiers |
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