| Name | Role | Place | Source | |
|---|---|---|---|---|
| Sander Koops | Child | 1912 | Ooststellingwerf | Civil registration births |
| Sander Koops | Groom | 1946 | Ooststellingwerf | Civil registration marriages |
| Sander Koops | Registered | 's-Gravenhage | Studbooks | |
| Sander Koops | Child | 1920 | Coevorden | Civil registration births |
| Sander Koops | Registered | 1920 | Coevorden | Population register |
| Sander Koops | Registered | 's-Gravenhage, Coevorden | Individual Files | |
| Sander Koops | Registered | 's-Gravenhage, Coevorden | Individual Files | |
| Sander Koops Haagsma | Seller | 1924 | Achtkarspelen | Notarial records |
| Sander Koops Haagsma | Buyer | 1921 | Achtkarspelen | Notarial records |
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