| Name | Role | Place | Source | |
|---|---|---|---|---|
| D. Maria de Block | Tewerkgestelde | 's-Gravenhage | Workforce registration | |
| D. de Block | Buyer | 1616 | Leeuwarden | Deeds of sale |
| Jacobus de Block kadastraal eigenaar in 1832 van perceel Koewacht D 496 | Registered | 1832 | Middelburg | Cadastre |
| Jacobus de Block kadastraal eigenaar in 1832 van perceel Koewacht D 497 | Registered | 1832 | Middelburg | Cadastre |
| Jacobus de Block kadastraal eigenaar in 1832 van perceel Koewacht D 498 | Registered | 1832 | Middelburg | Cadastre |
| Jacobus de Block kadastraal eigenaar in 1832 van perceel Koewacht D 499 | Registered | 1832 | Middelburg | Cadastre |
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