| Name | Role | Place | Source | |
|---|---|---|---|---|
| Cornelius Gerard Jacobus van Leeuwen | Tewerkgestelde | 's-Gravenhage | Workforce registration | |
| Cornelius Gerard Jacobus van Leeuwen | Tewerkgestelde | 's-Gravenhage | Workforce registration | |
| Jacobus Cornelius van Leeuwen | Deceased | 1964 | Noordwijkerhout | Civil registration deaths |
| Jacobus Cornelius van Leeuwen | Child | 1811 | Rotterdam | Church records baptisms |
| Jacobus Cornelius van Leeuwen | Child | 1875 | Woubrugge | |
| Jacobus Cornelius van Leeuwen | Deceased | 1964 | Noordwijkerhout |
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