| Name | Role | Place | Source | |
|---|---|---|---|---|
| Hendrikus Johannes Postman | Mention | 1830 | Groningen | Correspondence |
| Hendrikus Johannes Postman | Mention | 1832 | Veenhuizen | Correspondence |
| Hendrikus Johannes Postman | Mention | 1832 | Veenhuizen | Correspondence |
| Johannes Hendrikus Postman | Mention | 1833 | Veenhuizen | Correspondence |
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