| Name | Role | Place | Source | |
|---|---|---|---|---|
| Benjamin Jozeph Leefsma | Debtor | 1897 | Opsterland | Notarial records |
| Benjamin Jozeph Leefsma | Deceased | 1921 | Apeldoorn | Civil registration deaths |
| Benjamin Jozeph Leefsma | Debtor | 1900 | Opsterland | Notarial records |
| Benjamin Jozeph Leefsma | Buyer | 1877 | Opsterland | Notarial records |
| Benjamin Jozeph Leefsma | 1927 | Apeldoorn | Civil registration deaths | |
| Benjamin Jozeph Leefsma | Voorzitter | 1893 | Opsterland | Notarial records |
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