| Name | Role | Place | Source | |
|---|---|---|---|---|
| Con. van Leeuwen Boonkamp | Tewerkgestelde | 's-Gravenhage, Sinapour | Workforce registration | |
| Constand August van Leeuwen Boomkamp | Tewerkgestelde | 's-Gravenhage, Singapore | Workforce registration | |
| Constand August van Leeuwen Boomkamp | Tewerkgestelde | 's-Gravenhage, Singapore | Workforce registration | |
| Constant August van Leeuwen Boomkamp | Registered | 1908 | Singapore | Inscription prisoner |
| Constant August van Leeuwen Boomkamp | Groom | 1942 | Utrecht | Civil registration marriages |
| Constant August van Leeuwen Boomkamp | Deceased | 1953 | Utrecht | Civil registration deaths |
| Constant August van Leeuwen Boomkamp | Registered | 1900 | Singapore (EI) | Population register |
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