| Name | Role | Place | Source | |
|---|---|---|---|---|
| Karel Cornelis van Leeuwen | Groom | 1935 | Amsterdam | Civil registration marriages |
| Karel Cornelis van Leeuwen | Registered | 's-Gravenhage | Roll of honor | |
| Karel Cornelis van Leeuwen | Registered | 1912 | Amsterdam | Militia records |
| Karel Cornelis van Leeuwen | Registered | 's-Gravenhage, Amsterdam | Individual Files | |
| Karel Cornelis van Leeuwen | Person in the population register | 1921 | Vlissingen, Amsterdam | Population register |
| Karel Pieter Cornelis van Leeuwen | Registered | 1922 | Population register |
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