| Name | Role | Place | Source | |
|---|---|---|---|---|
| Wilhelm Louis Frederik van Leeuwen | Registered | 1913 | 's-Gravenhage | Population register |
| Wilhelm Louis Frederik van Leeuwen | Registered | 1913 | 's-Gravenhage | Population register |
| Wilhelm Louis Frederik van Leeuwen | Groom | 1925 | 's-Gravenhage | Civil registration marriages |
| Wilhelm Louis Frederik van Leeuwen | Witness | 1919 | Leiden | |
| Wilhelm Louis Frederik van Leeuwen | Registered | 's-Gravenhage | CABR dossiers | |
| Wilhelm Louis Frederik van Leeuwen | Child | 1897 | 's-Gravenhage | Civil registration births |
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