| Name | Role | Place | Source | |
|---|---|---|---|---|
| Leendert Jacobus Ruijgrok | Father | 1961 | Delft | Civil registration deaths |
| Leendert Jacobus Ruijgrok | Registered | 1913 | 's-Gravenhage | Population register |
| Leendert Ruijgrok | Tewerkgestelde | 's-Gravenhage, Monster | Workforce registration | |
| Leendert Ruijgrol | Tewerkgestelde | 's-Gravenhage, Monster | Workforce registration | |
| Leendert Ruygrok | Tewerkgestelde | 's-Gravenhage, Monster | Workforce registration | |
| Leendert Ruygrok | Tewerkgestelde | 's-Gravenhage, Monster | Workforce registration | |
| Leendert Ruygrok | Tewerkgestelde | 's-Gravenhage, Monster | Workforce registration | |
| Leendert Ruygrok | Tewerkgestelde | 's-Gravenhage, Monster | Workforce registration |
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