| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gijsbert Izaak van Leeuwen | Registered | 1880 | Population register | |
| Gijsbert Izaak van Leeuwen | Military | Studbooks | ||
| Gijsbert Izaak van Leeuwen | Decorated | 's-Gravenhage | Registration honors | |
| Gijsbert Izaak van Leeuwen | Registered | 's-Gravenhage | Studbooks | |
| Gijsbert Izaak van Leeuwen | Groom | 1919 | Breda | Civil registration marriages |
| Gijsbert Izaak van Leeuwen | Groom | 1919 | Breda | Civil registration marriages |
| Gijsbert Izaak van Leeuwen | Deceased | 1966 | 's-Gravenhage | Civil registration deaths |
| Gijsbert Izaak van Leeuwen | Child | 1897 | Bodegraven | Civil registration births |
| Gijsbert Izaak van Leeuwen | Registered | 's-Gravenhage | PoW cards | |
| Gijsbert Izaäk van Leeuwen | Registered | 1913 | 's-Gravenhage | Population register |
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